SCHERING PLOUGH CORP
10-K, 2000-03-02
PHARMACEUTICAL PREPARATIONS
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                   SECURITIES AND EXCHANGE COMMISSION
                          WASHINGTON, D.C. 20549
                         Form 10-K Annual Report

PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT
                             OF 1934

For the fiscal year ended December 31, 1999    Commission file
                                                Number 1-6571
                    SCHERING-PLOUGH CORPORATION

Incorporated in New Jersey                         22-1918501
One Giralda Farms                              (I.R.S.Employer
Madison, New Jersey 07940-1000               Identification No.)
(973) 822-7000 (telephone number)

Securities registered pursuant to section 12(b) of the Act:

                                           Name of each exchange
Title of each class                          on which registered

Common Shares, $.50 par value             New York Stock Exchange

Preferred Share Purchase Rights*          New York Stock Exchange

*At the time of filing, the Rights were not traded
separately from the Common Shares.

Indicate by check mark whether the registrant has filed
all reports required to be filed by Section 13 or 15(d)
of the Securities Exchange Act of 1934 during the
preceding 12 months and has been subject to such filing
requirements for the past 90 days.  YES   X        NO

Indicate by check mark if disclosure of delinquent
filers pursuant to Item 405 of Regulation S-K is not
contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or
information statements incorporated by reference in
Part III of this Form 10-K or any amendment to this
Form 10-K.

Common shares outstanding as of January 31, 2000: 1,470,789,125

Aggregate market value of common shares at January 31,
2000 held by non-affiliates based on closing price: $64 billion.

                                              Part of Form 10-K
Documents incorporated by reference           incorporated into

Schering-Plough Corporation 1999              Parts I, II and IV
Annual Report to Shareholders

Schering-Plough Corporation Proxy             Part III
Statement for the annual meeting of
shareholders on April 25, 2000




                               Part I
Item 1.  Business

The terms "Schering-Plough" and the "Company," as used
herein, refer to Schering-Plough Corporation and its
subsidiaries, except as otherwise indicated by the
context.  Schering-Plough Corporation is a holding
company which was incorporated in 1970.

Subsidiaries of Schering-Plough Corporation are engaged
in the discovery, development, manufacturing and
marketing of pharmaceutical products worldwide.
Discovery and development efforts target the field of
human health.  However, application in the field of
animal health can result from these efforts.  The
Company views animal health applications as a means to
maximize the return on investments in discovery and
development. The Company operates primarily in the
prescription pharmaceutical marketplace.  However, the
Company historically has sought regulatory approval to
switch prescription products to over-the-counter (OTC)
status as a means of extending a product's life cycle.
In this way the OTC marketplace is yet another means of
maximizing the return on investments in discovery and
development. Effective January 1, 1999, the Company
changed the structure of its internal organization to
reflect this focus on pharmaceutical research and
development.  As a result, the Company reports as one
segment. Previously, the Company was organized into two
business units: pharmaceuticals and health care.

Prescription products include: CLARITIN, CLARITIN-D,
NASONEX, PROVENTIL, VANCENASE and VANCERIL,
allergy/respiratory; CEDAX, EULEXIN, GARAMYCIN, INTRON
A, REBETRON Combination Therapy containing REBETOL
capsules and INTRON A injection, REMICADE and TEMODAR,
anti-infective and anticancer; DIPROLENE, DIPROSONE,
ELOCON, and LOTRISONE, dermatologicals; IMDUR,
INTEGRILIN, K-DUR and NITRO-DUR, cardiovasculars;
CELESTONE, and SUBUTEX, other pharmaceuticals.

Animal health products include:  NUFLOR, TRIBRISSEN and
CEPRAVIN, antimicrobials; SPOT-ON, PULVEX, AUTOWORM and
TRIATOX, parasiticides; BANAMINE and ELTANAC, non-
steroidal anti-inflammatories; RALGRO, a growth
promotant implant; OTOMAX, OPTIMMUNE, and GENTOCIN
TOPICAL SPRAY, otic, ophthalmic and topical products;
a broad range of vaccines for many species; sutures,
bandages and nutritional products. In June 1997, the
Company purchased the worldwide animal health
operations of Mallinckrodt Inc. The acquisition was
recorded under the purchase method of accounting at a
cost of approximately $490 million, which includes the
assumption of debt and direct costs of the acquisition.

Foot care, OTC and sun care products include: CLEAR
AWAY wart remover; DR. SCHOLL'S foot care products;
LOTRIMIN AF and TINACTIN antifungals; A & D ointment;
AFRIN nasal decongestant; CHLOR-TRIMETON antihistamine;
CORICIDIN and DRIXORAL cold and decongestant products;
CORRECTOL laxative; GYNE-LOTRIMIN for vaginal yeast
infections; COPPERTONE, BAIN DE SOLEIL and SOLARCAINE
sun care products.

Net sales by major therapeutic category for each of the
three years in the period ended December 31, 1999 were
as follows (dollars in millions):

<TABLE>
<CAPTION>

                                   1999       1998      1997
<S>                              <C>        <C>       <C>
Allergy & Respiratory            $3,850     $3,375    $2,708
Anti-infective and Anticancer     1,738      1,263     1,156
Dermatologicals                     682        619       571
Cardiovasculars                     673        750       637
Other Pharmaceuticals               792        688       649
Animal Health                       678        647       389
Foot Care                           348        336       300
OTC                                 221        218       220
Sun Care                            194        181       148
Consolidated net sales           $9,176     $8,077    $6,778
</TABLE>

The "Segment Information" as set forth in the Notes to
Consolidated Financial Statements in the Company's 1999
Annual Report to Shareholders is incorporated herein by
reference.

Prescription drugs are introduced and made known to
physicians, pharmacists, hospitals and managed care
organizations by trained professional service
representatives, and are sold to hospitals, managed
care organizations, wholesale distributors and retail
druggists.  Prescription products are also promoted
through journal advertising, direct mail advertising,
consumer advertising and by distributing samples to
physicians.

Animal health products are promoted to veterinarians,
distributors and animal producers.

Foot care, OTC and Sun care products are sold through
wholesale and retail drug, food chain and mass
merchandiser outlets, and are promoted directly to the
consumer through television, radio, internet,  print
and other advertising media.

The Company's subsidiaries own (or have licensed rights
under) a number of patents and patent applications,
both in the United States and abroad.  Patents and
patent applications relating to the Company's
significant products, including without limitation the
CLARITIN family of products, INTRON A and REBETRON
Combination Therapy, containing REBETOL (ribavirin)
capsules and INTRON A (interferon alfa-2b) Injection
are of material importance to the Company.  Certain
CLARITIN (loratadine) related patents expire in the
next several years.  Specifically, the loratadine
compound patent for CLARITIN in the United States
expires in 2002 and the compound patent for
desloratadine, an active metabolite of loratadine,
expires in 2004.  These patents are subject to
litigation as described in Item 3, Legal Proceedings,
of this Form 10-K.

Worldwide, the Company's products are sold under
trademarks.  Trademarks are considered in the aggregate
to be of material importance to the business and are
protected by registration or common law in the United
States and most other markets where the products are
sold.

Raw materials essential to the Company are available in
adequate quantities from a number of potential
suppliers.  Energy is expected to be available to the
Company in sufficient quantities to meet operating
requirements. There was no disruption experienced as a
result of the Year 2000 computer issue.

Seasonal patterns do not have a pronounced effect on
the combined operations of the Company.

There is generally no significant backlog of orders
since the Company's business is normally conducted on
an immediate shipment basis.

The pharmaceutical industry is highly competitive and
includes other large companies with substantial
resources for research, product development, promotion
and field selling support.  There are numerous domestic
and international competitors in this industry.  Some
of the principal competitive techniques used by the
Company for its products include research and
development of new and improved products, high product
quality, varied dosage forms and strengths, and
switching prescription products to non-prescription
status.  In the United States, many of the Company's
products are subject to increasingly competitive
pricing as managed care groups, institutions,
government agencies and other buying groups seek price
discounts and rebates.  Governmental and other
pressures toward the dispensing of generic products may
significantly reduce the sales of certain products when
they become no longer protected by patents.

During 1999 and 1998, 12 percent and 11 percent,
respectively, of consolidated net sales were made to
McKesson HBOC Inc., a major pharmaceutical and health
care products distributor; substantially all of these
sales were in the United States.

Foreign Operations

Foreign activities are carried out primarily through
wholly-owned subsidiaries wherever market potential is
adequate and circumstances permit.  In addition, the
Company is represented in some markets through
licensees or other distribution arrangements.  There
are approximately 14,500 employees outside the United
States.

Foreign operations are subject to certain risks which
are inherent in conducting business overseas.  These
risks include possible nationalization, expropriation,
importation limitations and other restrictive
governmental actions.  Also, fluctuations in foreign
currency exchange rates can impact the Company's
consolidated financial results.  For additional
information on foreign operations, see "Management's
Discussion and Analysis of Operations and Financial
Condition" and "Segment Information" in the Company's
1999 Annual Report to Shareholders which is
incorporated herein by reference.

Research and Development

The Company's research activities are primarily aimed
at discovering and developing new and enhanced
prescription  products of medical and commercial
significance.  Company sponsored research and
development expenditures were $1,191 million, $1,007
million and $847 million in 1999, 1998, and 1997,
respectively.  Research expenditures represented
approximately 13 percent of consolidated net sales in
each of the three years.

The Company's research activities are concentrated in
the therapeutic areas of allergic and inflammatory
disorders, infectious and cardiovascular diseases,
oncology and central nervous system disorders.  The
Company also has substantial efforts directed toward
biotechnology, gene therapy and immunology.  Research
activities include expenditures for both internal
research efforts and research collaborations with
various partners.

While several pharmaceutical compounds are in varying
stages of development, it cannot be predicted when or
if these compounds will become available for commercial
sale.

Government Regulation

Pharmaceutical companies are subject to extensive
regulation by a number of national, state and local
agencies.  Of particular importance is the United
States Food and Drug Administration (FDA).  It has
jurisdiction over all the Company's businesses and
administers requirements covering the testing,
approval, safety, effectiveness, manufacturing,
labeling and marketing of the Company's products.  In
some cases, FDA requirements and/or reviews have
increased the amount of time and money necessary to
develop new products and bring them to market in the
United States.

On an ongoing basis the FDA regulates the facilities
and procedures used to manufacture pharmaceutical
products in the United States or for sale in the United
States.  All products made in such facilities must be
manufactured in accordance with "good manufacturing
practices" established by the FDA.  The FDA
periodically inspects the Company's facilities and
procedures to assure compliance.

Failure to comply with government regulations can
result in delays in the release of products, seizure or
recall of products, suspension or revocation of the
authority necessary for the production and sale of
products, fines and other civil or criminal sanctions.

The Company's activities outside the United States are
also subject to regulatory requirements governing the
testing, approval, safety, effectiveness,
manufacturing, labeling and marketing of the Company's
products, which requirements vary from country to
country.  Whether or not FDA approval or approval of
the European Medicines Evaluation Agency has been
obtained for a product, approval of the product by
comparable regulatory authorities of countries outside
of the United States or the European Union, as the case
may be, must be obtained prior to marketing the product
in those countries.  The approval process may be more
or less rigorous from country to country and the time
required for approval may be longer or shorter than
that required in the United States.  Approval in one
country does not assure that such product will be
approved in another country.

In most international markets, the Company operates in
an environment of government-mandated, cost-containment
programs.  Several governments have placed restrictions
on physician prescription levels and patient
reimbursements, emphasized greater use of generic drugs
and enacted across-the-board price cuts as methods of
cost control.

In recent years various legislative proposals have been
offered in Congress and in some state legislatures that
would effect major changes in the affected health care
systems.  Some states have passed legislation, and
further federal and state proposals are possible.
These could include price or patient reimbursement
constraints on medicines and restrictions on access to
certain products.  Similar issues have also arisen in
many countries outside of the United States.  It is not
possible to predict the outcome of such initiatives and
their effect on operations and cash flows cannot be
reasonably estimated.

The Company is also subject to the jurisdiction of
various other regulatory and enforcement departments
and agencies, such as the Federal Trade Commission
(FTC), the Department of Justice and the Department of
Health and Human Services in the United States.  The
Company is, therefore, subject to possible
administrative and legal proceedings and actions by
those organizations.  Such actions may result in the
imposition of civil and criminal sanctions, which may
include fines, penalties and injunctive or
administrative remedies.

Environment

To date, compliance with federal, state and local
environmental protection laws has not had a materially
adverse effect on the Company.  The Company has made
and will continue to make necessary expenditures for
environmental protection.  Worldwide capital
expenditures during 1999 included approximately $7
million for environmental control purposes.  It is
anticipated that continued compliance with such
environmental regulations will not significantly affect
the Company's financial statements or its competitive
position.  For additional information on environmental
matters, see "Legal and Environmental Matters" in the
Notes to Consolidated Financial Statements in the
Company's 1999 Annual Report to Shareholders which is
incorporated herein by reference.

Employees

There were approximately 26,500 people employed by the
Company at December 31, 1999.

Cautionary Factors that May Affect Future Results

(Cautionary Statements Under the Private Securities
Litigation Reform Act of 1995)

This report and other written reports and oral
statement made from time-to-time by the Company may
contain so-called "forward-looking statements," all of
which are subject to risks and uncertainties.  One can
identify these forward-looking statements by their use
of words such as "expects," "plans," "will,"
"estimates," "forecasts," "projects," "believes,"
"anticipates," and other words of similar meaning.  One
can also identify them by the fact that they do not
relate strictly to historical or current facts.  These
statements are likely to address the Company's growth
strategy, financial results, regulatory issues, product
approvals, development programs, litigation and
investigations.  One must carefully consider any such
statement and should understand that many factors could
cause actual results to differ from the Company's
forward-looking statements.  These factors include
inaccurate assumptions and a broad variety of other
risks and uncertainties, including some that are known
and some that are not.  No forward-looking statement
can be guaranteed and actual future results may vary
materially.  Although it is not possible to predict or
identify all such factors, they may include the
following:

     - Competitive factors including technological
     advances attained by competitors, patents granted
     to competitors, new products of competitors coming
     to the market, generic competition as the
     Company's products mature and patent expiration on
     products.

     - Increased pricing pressure both in the United
     States and abroad from managed care buyers,
     institutions and government agencies.  In the
     United States, among other developments,
     consolidation among customers may increase price
     pressures and may result in various customers
     having greater influence over prescription
     decisions through formulary decisions and other
     policies.

     - Government laws and regulations (and changes in
     laws and regulations) affecting domestic and
     international operations and the enforcement
     thereof including, among other laws and
     regulations, those resulting from healthcare
     reform initiatives in the United States at the
     state and federal level and in other countries, as
     well as laws and regulations relating to trade,
     antitrust, monetary and fiscal policies, taxes,
     price controls, and possible nationalization.

     - Patent positions can be highly uncertain and
     patent disputes are not unusual.  An adverse
     result in a patent dispute can preclude
     commercialization of products or negatively impact
     sales of existing products or result in injunctive
     relief and payment of financial remedies.

     - Uncertainties of the FDA approval process and
     the regulatory approval processes of non-U.S.
     countries, including, without limitation, delays
     in approval of new products.

     - Failure to meet "good manufacturing practices"
     established by governmental authorities can result
     in delays in the release of products, seizure or
     recall of products, suspension or revocation of
     the authority necessary for the production and
     sale of products, fines and other civil or
     criminal sanctions.

     - Difficulties in product development.
     Pharmaceutical product development is highly
     uncertain.  Products that appear promising in
     development may fail to reach market for numerous
     reasons.  They may be found to be ineffective or
     to have harmful side effects in clinical or pre-
     clinical testing, they may fail to receive the
     necessary regulatory approvals, they may turn out
     not to be economically feasible because of
     manufacturing costs or other factors or they may
     be precluded from commercialization by the
     proprietary rights of others.

     - Efficacy or safety concerns with respect to
     marketed products, whether or not scientifically
     justified, leading to recalls, withdrawals or
     declining sales.

     - Major products such as CLARITIN and INTRON
     A/REBETRON Combination Therapy accounted for a
     material portion of the Company's 1999 revenues.
     If any major product, such as CLARITIN and INTRON
     A/REBETRON Combination Therapy, were to become
     subject to a problem such as loss of patent
     protection, previously unknown side effects or if
     a new, more effective treatment should be
     introduced, the impact on revenues could be
     significant.

     - Failure of the Company to foresee and correct
     systems and commercial arrangements to address the
     new European currency (euro).

     - Legal factors, including product liability
     claims and other litigation, government
     investigations, patent disputes with competitors,
     environmental concerns, any of which could
     preclude commercialization of products or
     negatively affect the profitability of existing
     products.

     - Economic factors over which the Company has no
     control, including changes in inflation, interest
     rates and foreign currency exchange rates.

     - Changes in tax laws including changes related to
     taxation of foreign earnings.

     - Changes in accounting standards promulgated by
     the American Institute of Certified Public
     Accountants, the Financial Accounting Standards
     Board or the Securities and Exchange Commission
     that are adverse to the Company.

Item 2.  Properties

The Company's corporate headquarters is located in
Madison, New Jersey. Principal manufacturing facilities
are located in Kenilworth, New Jersey, Miami, Florida,
Omaha, Nebraska, Cleveland, Tennessee, Puerto Rico,
Argentina, Australia, Belgium, Canada, Colombia,
France, Ireland, Italy, Japan, Mexico, Singapore and
Spain.

The Company's principal research facilities are located
in Kenilworth and Union, New Jersey, Palo Alto and San
Diego, California  and Elkhorn, Nebraska.

The major portion of properties are owned by the
Company.  These properties are well maintained,
adequately insured and in good operating condition. The
Company's manufacturing facilities have capacities
considered appropriate to meet the Company's needs.

Item 3.  Legal Proceedings

Subsidiaries of the Company are defendants in 235
lawsuits involving approximately 400 plaintiffs arising
out of the use of synthetic estrogens by the mothers of
the plaintiffs.  In virtually all of these lawsuits,
many other pharmaceutical companies are also named
defendants.  The female plaintiffs claim various
injuries, including cancerous or precancerous lesions
of the vagina and cervix and a multiplicity of
pregnancy problems.  A number of suits involve infants
with birth defects born to daughters whose mother took
the drug.  The total amount claimed against all
defendants in all the suits amounts to more than $1.5
billion.  While it is not possible to precisely predict
the outcome of these proceedings, it is management's
opinion that it is remote that any material liability
in excess of the amount accrued will be incurred.

The Company is a party to, or otherwise involved in,
environmental clean-up actions or proceedings under the
Comprehensive Environmental Response, Compensation and
Liability Act (commonly known as Superfund) or under
equivalent state laws.  These actions or proceedings
seek to require the owners or operators of facilities
that treated, stored or disposed of hazardous
substances and transporters, and generators of such
substances to remediate contaminated facilities and/or
reimburse the government or private parties for their
clean-up costs.  The Company, along with such owners,
operators, transporters and generators, is alleged to
be a potentially responsible party (PRP) as an alleged
generator of hazardous substances found at certain
facilities.  In each proceeding, the government or
private litigants allege that any one PRP, including
the Company, is jointly and severally liable for all
clean-up requirements and costs.  Although joint and
several liability is alleged, a PRP's share of clean-up
costs is frequently determined on the basis of several
factors, including the type and quantity of hazardous
substances; however, the allocation process varies
greatly from facility to facility and may take years to
complete.  The Company's potential share of clean-up
costs also depends on how many other PRPs are involved
in the action or proceeding, insurance coverage,
available indemnity contracts and contribution rights
against other PRPs.  While it is not possible to
predict with certainty the outcome of any action or
proceeding, it is management's opinion that it is
remote that any material liability in excess of amounts
accrued will be incurred.

The Company is a defendant in more than 110 antitrust
actions commenced (starting in 1993) in state and
federal courts by independent retail pharmacies, chain
retail pharmacies and consumers.  The plaintiffs allege
price discrimination and/or conspiracy between the
Company and other defendants to restrain trade by
jointly refusing to sell prescription drugs at
discounted prices to the plaintiffs.

One of the federal cases is a class action on behalf of
approximately two-thirds of all retail pharmacies in
the United States and alleges a price-fixing
conspiracy.  The Company agreed to settle the federal
class action for a total of $22 million, which has been
paid in full.  The settlement provides, among other
things, that the Company shall not refuse to grant
discounts on brand-name prescription drugs to a
retailer based solely on its status as a retailer and
that, to the extent a retailer can demonstrate its
ability to affect market share of a Company brand-name
prescription drug in the same manner as a managed care
organization with which the retailer competes, it will
be entitled to negotiate similar incentives subject to
the rights, obligations, exemptions and defenses of the
Robinson-Patman Act and other laws and regulations.
The United States District Court in Illinois approved
the settlement of the federal class action in June
1996.  In June 1997, the Seventh Circuit Court of
Appeals dismissed all appeals from that settlement, and
it is not subject to further review.  The defendants
that did not settle the class action proceeded to trial
in September 1998.  The trial ended in November 1998
with a directed verdict in the defendants' favor.

In April 1997, certain of the plaintiffs in the federal
class action commenced another purported class action
in United States District Court in Illinois against the
Company and the other defendants who settled the
previous federal class action.  The complaint alleges
that the defendants conspired not to implement the
settlement commitments following the settlement
discussed above.  The District Court has denied the
plaintiffs' motion for a preliminary injunction
hearing.

The Company has settled all of the state retailer
actions, except California and Alabama.  The settlement
amounts were not material to the Company.  In addition,
in June 1999, the Alabama Supreme Court reversed the
denial of a motion for judgment on the pleadings in the
Alabama retailer case.  The court held that the Alabama
antitrust law did not apply to conspiracies alleged to
be in interstate commerce.  Based on that ruling, the
Alabama retailer case has been dismissed.

The Company has settled all of the state consumer
cases, except Alabama, North Dakota, South Dakota, West
Virginia and New Mexico.  The settlement amounts were
not material to the Company.  A motion is pending to
dismiss the Alabama consumer case based on the Alabama
Supreme Court decision in the retailer case.

In May 1998, the Company settled six of the federal
antitrust cases brought by 26 food and drug chain
retailers and several independent retail stores.
Plaintiffs in these cases comprise collectively
approximately one-fifth of the prescription drug retail
market.  Also in 1999, the Company settled federal
antitrust cases brought by independent pharmacists and
small pharmacy chains comprising about 2% of the
prescription drug retail market.  The settlement
amounts were not material to the Company.

Plaintiffs in these antitrust actions generally seek
treble damages in an unspecified amount and an
injunction against the allegedly unlawful conduct.

The Company believes all the antitrust actions are
without merit and is defending itself vigorously.

In March, 1996, the Company was notified that the
United States Federal Trade Commission (FTC) is
investigating whether the Company, along with other
pharmaceutical companies, conspired to fix prescription
drug prices.  The investigation is ongoing.  The
Company believes that its actions have been lawful and
proper and is cooperating in the investigation.
However, it is not possible to predict the outcome of
the investigation which could result in the imposition
of fines, penalties and injunctive or administrative
remedies.

In October 1999, the Company received a subpoena from
the U.S. Attorney's Office for the Eastern District of
Pennsylvania, pursuant to the Health Insurance
Portability and Accountability Act of 1996, concerning
the Company's contracts with pharmacy benefit managers
(PBMs) and managed care organizations to provide
disease management services in connection with the
marketing of its pharmaceutical products.  It appears
that the subpoena is one of a number addressed to
industry participants including PBMs, managed care
organizations and manufacturers as a part of an inquiry
into, among other things, marketing practices.  The
government's inquiry appears to focus on whether the
Company's disease management and other marketing
programs comply with federal health care laws and
whether the value of its disease management programs
should have been included in the calculation of rebates
to the government.  The Company believes that its
disease management and other marketing programs have
been designed to comply with the law and that its
rebate calculations have properly excluded the value of
its disease management programs.  The Company is
cooperating in the investigation.  However, it is not
possible to predict the outcome of the investigation,
which could include the imposition of fines, penalties
and injunctive or administrative remedies.  Nor can the
Company predict whether the investigation will affect
its marketing practices or sales.

The Company is a party to an arbitration filed by
Biogen, Inc. (Biogen) in a dispute over the method used
by the Company to determine the amount of royalties
payable to Biogen on sales of REBETRON Combination
Therapy containing REBETOL Capsules and INTRON A
Injection.  The Company believes that it should prevail
in this arbitration.  However, there can be no
assurance that the Company will prevail.

In February 1998, Geneva Pharmaceuticals, Inc. (Geneva)
submitted an Abbreviated New Drug Application (ANDA) to
the U.S. Food and Drug Administration (FDA) seeking to
market a generic form of CLARITIN in the United States
several years before the expiration of the Company's
patents.  Geneva has alleged that certain of the
Company's U.S. CLARITIN patents are invalid and
unenforceable.  The CLARITIN patents are material to
the Company's business.  In March 1998, the Company
filed suit in federal court seeking a ruling that
Geneva's ANDA submission constitutes willful
infringement of the Company's patents and that its
challenge to the Company's patents is without merit.
The Company believes that it should prevail in the
suit.  However, as with any litigation, there can be no
assurance that the Company will prevail.

During 1999, Copley Pharmaceutical, Inc., Teva
Pharmaceuticals, Inc., Novex Pharma and Zenith Goldline
Pharmaceuticals individually notified the Company that
each had submitted an ANDA to the FDA seeking to market
certain generic forms of CLARITIN in the United States
before the expiration of certain of the Company's
patents, and in 2000 Andrx Pharmaceuticals, L.L.C.
(Andrx) made a similar submission relating to CLARITIN-
D 24 Hour tablets.  Each has alleged that one or more
of those patents are invalid and unenforceable.  In
each case, except Andrx, the Company has filed suit in
federal court seeking a ruling that the applicable ANDA
submission and proposed marketing of a generic product
constitute willful infringement of the Company's patent
and that the challenge to the patent is without merit.
The Company will file a similar suit against Andrx in
federal court.  The Company believes that it should
prevail in these suits.  However, as with any
litigation, there can be no assurance that the Company
will prevail.

In January 2000, Hoffmann-La Roche Inc. filed actions
against the Company in United States District Court in
New Jersey and in France alleging that the Company's
PEG-INTRON (peginterferon alfa-2b) infringes Hoffmann-
La Roche Inc.'s patents on certain pegylated
interferons.  The Company believes that it should
prevail in these suits.  However, as with any
litigation, there can be no assurance that the Company
will prevail.

Item 4.  Submission of Matters to a Vote of Security
Holders

Not applicable.

Executive Officers of the Registrant

The following information regarding executive officers is
included herein in accordance with Part III, Item 10.

Officers are elected to serve for one year and until their
successors shall have been duly elected.

Name and Current Position          Business Experience           Age

Richard Jay Kogan                  Present position 1998;        58
  Chairman of the Board            President and Chief Executive
  and Chief Executive Officer      Officer 1996-1998; President
                                   and Chief Operating Officer
                                   1986-1995

Raul E. Cesan                      Present position 1998;        52
  President and Chief              Executive Vice President
  Operating Officer                and President Schering-
                                   Plough Pharmaceuticals
                                   1994-1998

Hugh A. D'Andrade                  Present position 1996;        61
  Vice Chairman and                Executive Vice President
  Chief Administrative Officer     Administration 1984-1995

Joseph C. Connors                  Present position 1996;        51
  Executive Vice President         Senior Vice President and
  and General Counsel              General Counsel 1992-1995

Jack L. Wyszomierski               Present position 1996;        44
  Executive Vice President         Vice President and Treasurer
  and Chief Financial Officer      1991-1995

Geraldine U. Foster                Present position 1994;        57
  Senior Vice President            Vice President - Investor
  Investor Relations and           Relations 1988-1994
  Corporate Communications

Daniel A. Nichols                  Present position 1991         59
  Senior Vice President
  Taxes

John P. Ryan                       Present position 1998;        59
  Senior Vice President            Vice President-Human Resources
  Human Resources                  Schering-Plough Pharmaceuticals
                                   1988-1998

Douglas J. Gingerella              Present position 1999;        41
  Vice President, Corporate        Staff Vice President, Corporate
  Audits                           Audits 1995-1998; Director
                                   Corporate Audits 1991-1995

Thomas H. Kelly                    Present position 1991         50
  Vice President and
  Controller

Robert S. Lyons                    Present position 1991         59
  Vice President
  Corporate Information
  Services

E. Kevin Moore                     Present position 1996;        47
  Vice President and               Staff Vice President and
  Treasurer                        Assistant Treasurer 1993-1995;
                                   Treasurer-Europe, The Dun and
                                   Bradstreet Corporation 1990-1993

John E. Nine                       Present position 1996;        63
  Vice President                   President - Technical Operations
  and President, Schering          Schering Laboratories 1990-1995
  Technical Operations

William J. Silbey                  Present position 1996;        40
  Staff Vice President,            Corporate Counsel 1993-1995;
  Secretary and Associate          Partner - Stearns, Weaver, Miller,
  General Counsel                  Weissler, Alhadeff & Sitterson,
                                   P.A. 1992-1993



                               Part II

Item 5.  Market for Registrant's Common Equity and Related
         Stockholder Matters

The common share dividends and share price data as set
forth in the Company's 1999 Annual Report to
Shareholders are incorporated herein by reference.

Item 6.  Selected Financial Data

The Six-Year Selected Financial & Statistical Data as set
forth in the Company's 1999 Annual Report to
Shareholders is incorporated herein by reference.

Item 7.  Management's Discussion and Analysis of Financial
         Condition and Results of Operations

Management's Discussion and Analysis of Operations and
Financial Condition as set forth in the Company's 1999
Annual Report to Shareholders is incorporated herein by
reference.

Item 7(a). Quantitative and Qualitative Disclosures about
           Market Risk

The Market Risk Disclosures as set forth in Management's
Discussion and Analysis of Operations and Financial
Condition in the Company's 1999 Annual Report to
Shareholders is incorporated herein by reference.

Item 8.  Financial Statements and Supplementary Data

The Consolidated Balance Sheets as of December 31, 1999
and 1998, and the related Statements of Consolidated
Income, Consolidated Shareholders' Equity and
Consolidated Cash Flows for each of the three years in
the period ended December 31, 1999, Notes to
Consolidated Financial Statements, the Independent
Auditors' Report of Deloitte & Touche LLP dated
February 11, 2000 and Quarterly Data, as set forth in
the Company's 1999 Annual Report to Shareholders, are
incorporated  herein by reference.

Item 9.  Changes in and Disagreements with Accountants on
         Accounting and Financial Disclosure

Not applicable.

                               Part III

Item 10. Directors and Executive Officers of the Registrant

The information concerning directors and nominees for
directors as set forth in the Company's Proxy Statement
for the annual meeting of shareholders on April 25,
2000 is incorporated herein by reference.

Information required as to executive officers is included
in Part I of this filing under the caption "Executive
Officers of the Registrant."

Item 11. Executive Compensation

Executive compensation information as set forth in the
Company's Proxy Statement for the annual meeting of
shareholders on April 25, 2000 is incorporated herein
by reference.

Item 12. Security Ownership of Certain Beneficial Owners
         and Management

Information concerning security ownership of certain
beneficial owners and management as set forth in the
Company's Proxy Statement for the annual meeting of
shareholders on April 25, 2000 is incorporated herein
by reference.

Item 13. Certain Relationships and Related Transactions

None



                               Part IV

Item 14. Exhibits, Financial Statement Schedules, and
         Reports on Form 8-K

  (a) 1. Financial Statements

         The following consolidated financial statements and
         independent auditors' report, included in the Company's
         1999 Annual Report to Shareholders, are incorporated
         herein by reference.

         Statements of Consolidated Income For the
            Years Ended December 31, 1999, 1998 and 1997

         Statements of Consolidated Shareholders' Equity For the
            Years Ended December 31, 1999, 1998 and 1997

         Statements of Consolidated Cash Flows For the Years
            Ended December 31, 1999, 1998 and 1997

         Consolidated Balance Sheets at December 31, 1999 and
            1998

         Notes to Consolidated Financial Statements

         Independent Auditors' Report



(a)  2. Financial Statement Schedules
                                                 Page in
                                                 Form 10-K

Independent Auditors' Report . . . . . . . . . . . 24

Schedule II - Valuation and Qualifying Accounts. . 25

Schedules not included have been omitted because they are
not applicable or not required or because the required
information is set forth in the financial statements or
the notes thereto.  Columns omitted from schedules
filed have been omitted because the information is not
applicable.

Financial statements of fifty percent or less owned
companies accounted for by the equity method have been
omitted because, considered individually or in the
aggregate, they do not constitute a significant
subsidiary.

(a) 3. Exhibits

Exhibit
Number                        Description

3(a)         A complete copy of the Certificate of Incorporation
             as amended and currently in effect. Incorporated by
             reference to Exhibit 3 (i) to the Company's
             Quarterly  Report for the period ended June
             30, 1995 on Form 10-Q; Certificate of Amendment
             of Certificate of Incorporation incorporated by
             reference to Exhibit 3  to the Company's
             Quarterly Report for the period ended  June
             30, 1997 on Form 10-Q; Certificate of
             Amendment  of Certificate of Incorporation
             incorporated by reference to Exhibit 3(a) to
             the Company's Quarterly Report for the period
             ended March 31, 1999 on Form 10-Q, File No. 1-6571.

3(b)         A complete copy of the By-Laws as amended and
             currently in effect.  Incorporated by reference to
             Exhibit 4(2) to the Company's Registration Statement
             on Form S-3, File No. 333-853; amendment to By-Laws
             effective September 22, 1998 incorporated by reference
             to Exhibit 4 to the Company's Quarterly Report for the
             period ended September 30, 1998 on Form 10-Q, File No.
             1-6571.

4(a)         Rights Agreement between the Company and The Bank of
             New York dated June 24, 1997.  Incorporated by
             reference to Exhibit 1 to the Form 8-A filed by the
             Company on June 30, 1997, File No. 1-6571.

4(b)         Indenture dated as of November 1, 1982 between the
             Company and The Chase Manhattan Bank, N.A. as
             Trustee. Incorporated by reference to Exhibit 4(a)to
             the Company's Registration Statement on Form S-3, File
             No. 2-80012.

4(c)         Form of Participation Rights Agreement between the
             Company and The Chase Manhattan Bank (National
             Association), as Trustee.  Incorporated by reference
             to Exhibit 4.6 to the Company's Registration
             Statement on Form S-4, Amendment No. 1, File
             No. 33-65107.

10(a)        The Company's Executive Incentive Plan (as amended)
             and Trust related thereto.*  Plan incorporated by
             reference to Exhibit 10 to the Company's Quarterly
             Report for the period ended March 31, 1994 on
             Form 10-Q;  Trust Agreement incorporated by
             reference to Exhibit 10(a) to the Company's Annual
             Report for 1988 on Form 10-K; amendment to Trust
             Agreement incorporated by reference to Exhibit 10(b)
             to the Company's Quarterly Report for the period
             ended March 31, 1997 on Form 10-Q, File No. 1-6571.

10(b)        The Company's 1987 Stock Incentive Plan (as
             amended).*  Incorporated by reference to Exhibit
             10(d) to the Company's Annual Report for 1990 on
             Form 10-K, File No. 1-6571.

10(c)        The Company's 1992 Stock Incentive Plan (as amended).*
             Incorporated by reference to Exhibit 10(d) to the
             Company's Annual Report for 1992 on Form 10-K, File
             No. 1-6571; amendment of December 11, 1995
             incorporated by reference to Exhibit 10(d)to the
             Company's Annual Report for 1995 on Form 10-K, File
             No. 1-6571.

10(d)        The Company's 1997 Stock Incentive Plan.*
             Incorporated by reference to Exhibit 10 to the
             Company's Quarterly Report for the period ended
             September 30, 1997 on Form 10-Q; Amendment to 1997
             Stock Incentive Plan incorporated by reference to
             Exhibit 10(a) to the Company's Quarterly Report
             for the period ended March 31, 1999 on Form 10-Q,
             File No. 1-6571.

10(e)(i)     Employment agreement between the Company and Richard
             J. Kogan (as amended).*  Incorporated by reference to
             Exhibit 10(e)(ii) to the Company's Annual Report
             for 1989 on Form 10-K; first amendment incorporated
             by reference to Exhibit 10(b) to the Company's
             Quarterly Report for the period ended June 30, 1994
             on Form 10-Q; second amendment incorporated by
             reference to Exhibit 10(e)(ii) to the Company's
             Annual Report for 1994 on Form 10-K; third amendment
             incorporated by reference to Exhibit 10(a) to the
             Company's Quarterly Report for the period ended
             September 30, 1995 on Form 10-Q; fourth amendment
             incorporated by reference to Exhibit 10(b) to the
             Company's Quarterly Report for the period ended March
             31, 1998 on Form 10-Q; fifth amendment incorporated by
             reference to Exhibit 10(e)(ii) to the Company's Annual
             Report for 1998 on  Form 10-K, File No. 1-6571.

10(e)(ii)    Employment agreement between the Company and Hugh A.
             D'Andrade (as amended).*  Incorporated by
             reference to Exhibit 10(c) to the Company's
             Quarterly Report for the period ended June 30, 1994
             on Form 10-Q;  first amendment incorporated by
             reference to Exhibit 10(e)(iii) to the Company's
             Annual Report for 1994 on Form 10-K, File No.
             1-6571; second amendment incorporated by reference to
             Exhibit 10(e)(iii) to the Company's Annual Report for
             1995 on Form 10-K; third amendment incorporated by
             reference to Exhibit 10(c) to the Company's Quarterly
             Report for the period ended March 31, 1998 on Form
             10-Q; fourth amendment incorporated by reference to
             Exhibit 10(e)(iii) to the Company's Annual Report for
             1998 on Form 10-K, File No. 1-6571.

10(e)(iii)   Form of employment agreement between the Company and
             its executive officers effective upon a change of
             control.*  Incorporated by reference to Exhibit
             10(e)(iv) to the Company's Annual Report for 1994 on
             Form 10-K; Form of amendment incorporated by reference
             to Exhibit 10(a) to the Company's Quarterly Report for
             the period ended September 30, 1999 on Form 10-Q, File
             No. 1-6571.

10(e)(iv)    Employment agreement between the Company and Raul E.
             Cesan.* Incorporated by reference to Exhibit 10(e)(vi)
             to the Company's Annual Report for 1998 on Form 10-K,
             File No. 1-6571.

10(e)(v)     Employment agreement between the Company and Robert P.
             Luciano (as amended).*  Incorporated by reference to
             Exhibit 10(e)(i) to the Company's Annual Report for
             1989 on Form 10-K; first amendment incorporated by
             reference to Exhibit 10(a) to the Company's Quarterly
             Report for the period ended June 30, 1994 on Form 10-Q;
             second amendment incorporated by reference 10(e)(i) to
             the Company's Annual Report for 1994 on Form 10-K;
             third amendment incorporated by reference to
             Exhibit 10(a)  to the Company's Quarterly Report for
             the period ended March 31, 1998 on Form 10-Q,
             File No. 1-6571.

10(e)vi      Agreement between the Company and Robert P. Luciano.*
             Incorporated by reference to Exhibit 10(d) to the
             Company's Quarterly Report for the period ended March
             31, 1998 on Form 10-Q, File No. 1-6571.

10(f)        Amended and Restated Directors Deferred Compensation
             Plan and Trust related thereto.* Incorporated by
             reference to Exhibit 10 (b) to the Company's Quarterly
             Report for the period ended September 30, 1999 on Form
             10-Q; Trust Agreement incorporated by reference to
             Exhibit 10 (a) to the Company's Annual Report for 1998
             on Form 10-K; amendment to Trust Agreement incorporated
             by reference to Exhibit 10 (b) to the Company's
             Quarterly Report for the period ended March 31, 1997 on
             Form 10-Q, File No. 1-6571.

10(g)        Supplemental Executive Retirement Plan and Trust
             related thereto.*  Incorporated by reference to Exhibit
             10(e) to the Company's Quarterly Report for the period
             ended March 31, 1998 on Form 10-Q; amendment
             incorporated by reference to Exhibit 10(a) to the
             Company's Quarterly Report for the period ended
             September 30, 1998 on Form 10-Q; Amended
             and Restated Trust Agreement incorporated by reference
             to Exhibit 10(g)to the Company's Annual Report for 1998
             on Form 10-K, File No. 1-6571.

10(h)        Amended and Restated Directors' Stock Award Plan.*
             Incorporated by reference to Exhibit 10 (c)to the
             Company's Quarterly Report for the period ended
             September 30, 1999 on Form 10-Q, File No. 1-6571.

10(i)        Deferred Compensation Plan.*  Incorporated by reference
             to Exhibit 10(b) to the Company's Quarterly Report for
             the period ended September 30, 1995 on Form 10-Q, File
             No. 1-6571.

10(j)        Amended and Restated Directors Deferred Stock
             Equivalency Program.*  Incorporated by reference to
             Exhibit 10(d) to the Company's Quarterly Report for the
             period ended September 30, 1999 on Form 10-Q, File No.
             1-6571.

10(k)        The Company's Form of Split Dollar Agreement and
             related Collateral Assignment between the Company and
             its Executive Officers.*  Incorporated by reference to
             Exhibit 10(l) to the Company's Annual Report for 1997
             on Form 10-K; amendments incorporated by reference to
             Exhibit 10(g) to the Company's Quarterly Report for the
             period ended March 31, 1998 on Form 10-Q, File No.
             1-6571.

10(l)        The Company's Retirement Benefits Equalization Plan.*
             Incorporated by reference to Exhibit 10(f) to the
             Company's Quarterly Report for the period ended March
             31, 1998 on Form 10-Q; amendment incorporated by
             reference to Exhibit 10(b) to the Company's Quarterly
             Report for the period ended September 30, 1998 on Form
             10-Q, File No. 1-6571.

12           Computation of Ratio of Earnings to Fixed Charges
             (filed with this document).

13           The Financial Section of the Company's 1999 Annual
             Report to Shareholders.  With the exception of those
             portions of said Annual Report which are specifically
             incorporated by reference in this Form 10-K (filed with
             this document),such report shall not be deemed filed as
             part of this Form 10-K.

21           Subsidiaries of the registrant (filed with this
             document).

23           Consents of experts and counsel (filed with this
             document).

24           Power of attorney (filed with this document).

27           Financial Data Schedule (filed with this document).


All other exhibits are not applicable.  Copies of above
exhibits will be furnished upon request.

*  Compensatory plan, contract or arrangement.

(b) Reports on Form 8-K.

None

                              SIGNATURES

Pursuant to the requirements of Section 13 or 15 (d) of the
Securities Exchange Act of 1934, the registrant has duly caused
this report to be signed on its behalf by the undersigned,
thereunto duly authorized
                                             Schering-Plough Corporation
                                                    (Registrant)
Date        March 2, 2000                  By /s/ Thomas H. Kelly
                                                  Thomas H. Kelly
                                           Vice President and Controller

Pursuant to the requirements of the Securities Exchange Act of
1934, this report has been signed below by the following persons
on behalf of the registrant and in the capacities and on the date
indicated.

 By               *                       By               *
           Richard Jay Kogan                       Donald L. Miller
    Chairman of the Board and Chief                     Director
    Executive Officer and Director

 By               *                       By               *
            Raul E. Cesan                         H. Barclay Morley
    President and Chief Operating                      Director
       Officer and Director

 By               *                       By               *
         Jack L. Wyszomierski                      Carl E. Mundy, Jr.
    Executive Vice President and                       Director
       Chief Financial Officer

 By               *                       By               *
            Thomas H. Kelly                      Richard de J. Osborne
   Vice President and Controller                       Director
  and Principal Accounting Officer

 By               *                       By               *
           Hans W. Becherer                       Patricia F. Russo
              Director                                 Director

 By               *                       By               *
           Hugh A. D'Andrade                     William A. Schreyer
              Director                                 Director

 By               *                       By               *
          David C. Garfield                     Robert F. W. van Oordt
               Director                                Director

 By               *                       By               *
          Regina E. Herzlinger                   Arthur F. Weinbach
               Director                                Director

 By               *                       By               *
           Robert P. Luciano                          James Wood
               Director                                Director


*By     /s/Thomas H. Kelly               Date:       March 2, 2000
           Thomas H. Kelly
           Attorney-in-fact




                    INDEPENDENT AUDITORS' REPORT

Schering-Plough Corporation:

We have audited the financial statements of Schering-
Plough Corporation and subsidiaries as of December 31,
1999 and 1998, and for each of the three years in the
period ended December 31, 1999, and have issued our
report thereon dated February 11, 2000; such financial
statements and report are included in your 1999 Annual
Report to Shareholders and are incorporated herein by
reference.  Our audits also included the financial
statement schedule of Schering-Plough Corporation and
subsidiaries, listed in Item 14.  This financial
statement schedule is the responsibility of the
Company's management.  Our responsibility is to express
an opinion based on our audits.  In our opinion, such
financial statement schedule, when considered in
relation to the basic financial statements taken as a
whole, presents fairly in all material respects the
information set forth therein.



/s/DELOITTE & TOUCHE LLP

Parsippany, New Jersey
February 11, 2000





                                             SCHEDULE II
<TABLE>
           SCHERING-PLOUGH CORPORATION AND SUBSIDIARIES
                VALUATION AND QUALIFYING ACCOUNTS
       FOR THE YEARS ENDED DECEMBER 31, 1999, 1998, AND 1997
                     (Dollars in millions)

<CAPTION>

Valuation and qualifying accounts deducted from assets to which
they apply:

Allowances for accounts receivable:

                             RESERVE      RESERVE      RESERVE
                          FOR DOUBTFUL   FOR CASH     FOR CLAIMS
                            ACCOUNTS     DISCOUNTS     AND OTHER     TOTAL
<S>                           <C>          <C>          <C>          <C>
1999
Balance at beginning of
year                          $ 51         $ 18         $ 29        $ 98

Additions:
   Charged to costs and
   expenses                     17          146           12         175

Deductions from reserves        (8)        (142)         (30)       (180)
Effects of foreign
    exchange                    (1)           -            -          (1)

Balance at end of year       $  59        $  22        $  11        $ 92

1998
Balance at beginning of
year                         $ 49         $ 14         $ 24         $ 87

Additions:
   Charged to costs and
   expenses                    14          133           19          166

Deductions from reserves      (12)        (129)         (14)        (155)

Balance at end of year       $ 51         $ 18         $ 29         $ 98

1997
Balance at beginning of
year                         $ 50         $ 12         $ 11         $ 73

 Additions:
   Charged to costs and
   expenses                    17          103           20          140

 Deductions from reserves     (18)        (101)          (7)        (126)

Balance at end of year       $ 49         $ 14         $ 24         $ 87

</TABLE>


<TABLE>
                                                          Exhibit 12


                     SCHERING-PLOUGH CORPORATION AND SUBSIDIARIES
                  COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
                               (Dollars in millions)
<CAPTION>

                                              Year Ended December 31,
                                     1999       1998     1997      1996    1995
<S>                                <C>         <C>      <C>       <C>     <C>
Income Before Income Taxes from
   Continuing Operations . . . . . .$2,795     $2,326   $1,913    $1,606  $1,395

Add : Fixed Charges
  Interest Expense . . . . . . . . .    29         19       40        45      57
  1/3 Rentals. . . . . . . . . . . .    22         19       15        12      11
  Capitalized Interest . . . . . . .    12          9       15        11      11
    Total Fixed Charges. . . . . . .    63         47       70        68      79

Less: Capitalized Interest . . . . .    12          9       15        11      11
Add : Amortization of
 Capitalized Interest. . . . . . . .     7          7        5         5       5

Earnings Before Income Taxes and
 Fixed Charges (other than
 Capitalized Interest) . . . . . .  $2,853     $2,371   $1,973    $1,668  $1,468

Ratio of Earnings to Fixed Charges      45         50       28        25      19


"Earnings" consist of income before income taxes and fixed
charges (other than capitalized interest).  "Fixed
charges" consist of interest expense, capitalized interest
and one-third of rentals which Schering-Plough believes to
be a reasonable estimate of an interest factor on leases.

</TABLE>




                                            Exhibit 13


MANAGEMENT'S DISCUSSION AND ANALYSIS OF OPERATIONS AND
FINANCIAL CONDITION


NET SALES

Consolidated net sales in 1999 totaled $9.2 billion, an

increase of 14 percent over 1998, due to volume growth

of 13 percent and price increases of 1 percent.

Foreign exchange had a less than 1 percent impact on

the sales increase.  Net sales in the United States

increased 14 percent versus 1998 and advanced 13

percent internationally.  Foreign exchange negatively

impacted the international sales growth by 1 percent.



Consolidated 1998 net sales of $8.1 billion advanced 19

percent over 1997, reflecting volume growth of 19

percent and price increases of 2 percent, tempered by

unfavorable foreign exchange of 2 percent.  The

acquisition of the Mallinckrodt Inc. animal health

business in June 1997 favorably impacted sales growth

by 3 percent.  The sales of this business were included

for only half the year in 1997 and for the full year in

1998.



Net sales by major therapeutic category for the years

ended 1999, 1998 and 1997 were as follows ($ in

millions):

<TABLE>
<CAPTION>
                                                      % Increase (Decrease)
                              1999     1998     1997    1999/98    1998/97
<S>                         <C>      <C>      <C>          <C>        <C>
Allergy & Respiratory       $3,850   $3,375   $2,708       14%        25 %
Anti-infective & Anticancer  1,738    1,263    1,156       38          9
Dermatologicals                682      619      571       10          8
Cardiovasculars                673      750      637      (10)        18
Other Pharmaceuticals          792      688      649       16          6
Animal Health                  678      647      389        5         66
Foot Care                      348      336      300        3         12
Over-the-Counter (OTC)         221      218      220        1         (1)
Sun Care                       194      181      148        7         22
Consolidated net sales      $9,176   $8,077   $6,778       14%        19 %

</TABLE>

Worldwide net sales of allergy and respiratory products

increased 14 percent in 1999 and 25 percent in 1998,

due to continued strong market growth for the CLARITIN

line of nonsedating antihistamines.  Worldwide net

sales of the CLARITIN brand totaled $2.7 billion in

1999, $2.3 billion in 1998 and $1.7 billion in 1997.

Franchise sales of nasal inhaled steroid products,

which include VANCENASE allergy products and NASONEX, a

once-daily corticosteroid for allergic rhinitis,

increased in 1999 and 1998 due to market expansion in

the United States and the launch of NASONEX in several

international markets.  Sales of VANCERIL, an orally

inhaled steroid for asthma, declined $14 million in

1999 due to manufacturing issues and branded

competition.



Net sales of worldwide anti-infective and anticancer

products rose 38 percent compared with 1998. Growth was

led by combined worldwide sales of INTRON A (interferon

alfa-2b) and REBETRON Combination Therapy, containing

REBETOL (ribavirin) Capsules and INTRON A Injection,

which totaled $1.1 billion, up 56 percent from 1998.

Sales of these products grew because of increased use

in the treatment of chronic hepatitis C. The U.S. and

international launches of TEMODAR, a chemotherapy agent

for treating certain types of brain tumors, also

contributed to the increase in this therapeutic

category's sales in 1999.  These sales increases were

moderated by lower sales of EULEXIN, a prostate cancer

therapy, due to generic and branded competition.  In

1998, worldwide net sales of anti-infective and

anticancer products increased 9 percent due to INTRON A

and the mid-year 1998 introduction of REBETRON

Combination Therapy in the United States.  This

increase was moderated by lower sales of EULEXIN due to

generic and branded competition.



Dermatological products' worldwide net sales increased

10 percent in 1999 and 8 percent in 1998, due to higher

sales of LOTRISONE, an antifungal/anti-inflammatory

cream, and ELOCON, a medium-potency topical steroid.



Worldwide net sales of cardiovascular products declined

10 percent in 1999, due to generic competition in the

United States against IMDUR, an oral nitrate for

angina, and NORMODYNE, an alpha-beta blocker for

hypertension.  Partially offsetting these declines were

higher U.S. sales of INTEGRILIN, a platelet receptor

glycoprotein IIb/IIIa inhibitor, due to increased

market penetration following its launch in the second

quarter of 1998.  Sales of K-DUR, a sustained-release

potassium chloride supplement, increased in 1999 due to

market share growth.  In 1998, worldwide net sales of

cardiovascular products advanced 18 percent, reflecting

U.S. market expansion and market share growth for IMDUR

and K-DUR.



Other pharmaceuticals consist of products that do not

fit into the Company's major therapeutic categories,

such as SUBUTEX, a treatment for opiate addiction, and

revenues received from Novo Nordisk related to the

Company's co-promotion agreement for PRANDIN, an oral

antidiabetic agent.



Worldwide sales of animal health products increased 5

percent in 1999. Sales growth was driven by NUFLOR, a

broad-spectrum, multi-species antibiotic, and BANAMINE,

a non-steroidal anti-inflammatory agent.  Sales of

animal health products in 1998 increased 66 percent

over 1997.  Adjusting for the 1997 acquisition of the

Mallinckrodt animal health business, 1998 sales would

have increased 12 percent.  Sales growth in 1998 was

again driven by BANAMINE and NUFLOR.



Foot care product sales rose 3 percent in 1999 led by

increases in the DR. SCHOLL'S insoles product line due

to new product introductions and line extensions.

Sales grew 12 percent in 1998, reflecting increases in

the DR. SCHOLL'S and antifungal product lines.



Over-the-counter (OTC) product sales increased 1

percent in 1999 due to a strong spring cough/cold

season.  OTC product sales decreased slightly in 1998.



Sun care sales were up 7 percent in 1999 primarily due

to market growth. In 1998, sales grew 22 percent due to

early 1999 season purchases.

<TABLE>

SUMMARY OF COSTS AND EXPENSES:
(Dollars in millions)

<CAPTION>
                                                                % Increase
                            1999         1998         1997    1999/98  1998/97
<S>                       <C>          <C>          <C>        <C>      <C>
Cost of sales . . . . . . $1,800       $1,601       $1,308     12 %     22 %
% of net sales. . . . . .   19.6 %       19.8 %       19.3 %

Selling, general and
 administrative . . ..  . $3,434       $3,141       $2,664      9 %     18 %
% of net sales. . . . . .   37.4 %       38.9 %       39.3 %

Research and development. $1,191       $1,007       $  847     18 %     19 %
% of net sales. . . . . .   13.0 %       12.5 %       12.5 %

</TABLE>


Cost of sales as a percentage of net sales in 1999

decreased slightly versus 1998, due to favorable sales

mix.  The increase of 1998 cost of sales as a

percentage of net sales versus 1997 reflects higher

royalties and the inclusion of Mallinckrodt animal

health products, which generally have lower gross

margins.



Selling, general and administrative expenses in 1999

and 1998 decreased as a percentage of sales as sales

growth outpaced expansion of the field force and

increased promotional and selling-related spending.



Research and development expenses grew 18 percent to

$1.2 billion and represented 13.0 percent of sales in

1999.  In 1998, research and development expenses

increased 19 percent over 1997 and represented 12.5

percent of sales.  The higher spending in both years

reflects the Company's funding of both internal

research efforts and research collaborations with

various partners to develop a steady flow of innovative

products.  The Company expects research and development

spending for 2000 to increase by approximately 15

percent.



INCOME BEFORE INCOME TAXES

Income  before  income taxes totaled  $2.8  billion  in

1999,  an  increase of 20 percent over 1998.  In  1998,

income  before  income taxes was $2.3  billion,  up  22

percent over $1.9 billion in 1997.



INCOME TAXES

The Company's effective tax rate was 24.5 percent for

the years 1999, 1998 and 1997.  The effective tax rate

for each period was lower than the U.S. statutory

income tax rate principally due to tax incentives in

certain jurisdictions where manufacturing facilities

are located.  For additional information, see "Income

Taxes" in the Notes to Consolidated Financial

Statements.



NET INCOME

Net income in 1999 increased 20 percent to $2.1

billion.  Net income in 1998 increased 22 percent over

1997.  Differences in year-to-year exchange rates had a

less than 1 percent impact on net income growth in

1999.  After eliminating exchange differences in 1998,

net income would have risen approximately 24 percent.



EARNINGS PER COMMON SHARE

Diluted earnings per common share rose 20 percent in

1999 to $1.42 and 22 percent in 1998 to $1.18.  Foreign

currency exchange had no impact on 1999 diluted

earnings per common share.  The strengthening of the

U.S. dollar against most foreign currencies decreased

growth in earnings per common share in 1998.  Excluding

the impact of exchange rate fluctuations, diluted

earnings per common share would have increased

approximately 24 percent in 1998.  Basic earnings per

common share increased 20 percent in 1999 to $1.44 and

22 percent in 1998 to $1.20.



Under existing share repurchase programs authorized by

the Board of Directors, approximately 18 million common

shares were repurchased during 1999, 1998 and 1997.  A

$1 billion program was authorized in September 1997 and

commenced in January 1998.  At December 31, 1999,

approximately 13.3 million shares had been acquired

under the 1997 authorization and the program was

approximately 65 percent complete.



YEAR 2000

Many computer systems ("IT systems") and equipment and

instruments with embedded microprocessors ("non-IT

systems") had been designed to recognize only the last

two digits of a calendar year.  As previously reported,

the Company undertook an extensive project to remediate

or replace its date-sensitive IT and non-IT systems.

These systems have functioned properly since the first

of the year and management believes that future

operations will be unaffected by these matters.  The

Company did not experience any significant increase in

product sales as a result of Year 2000 concerns.



As of December 31, 1999, the Company spent $66 million

on the Year 2000 remediation/replacement project; $20

million has been capitalized and $46 million has been

expensed.  The expense for 1999 was $17 million, which

is approximately 10 percent of the Company's overall

annual information systems budget.  Additional costs to

repair or replace non-critical, non-IT equipment will

continue into the year 2000, but the costs are not

expected to be significant.



The estimates and conclusions in this description of

the Year 2000 issue contain forward-looking statements

and are based on management's estimates of future

events.



EURO

On January 1, 1999, certain member countries of the

European Union established a new common currency, the

euro.  Also on January 1, 1999, the participating

countries fixed the rate of exchange between their

existing legacy currencies and the euro.  The new euro

currency will eventually replace the legacy currencies

currently in use in each of the participating

countries.  Euro bills and coins will not be issued

until January 1, 2002.



Companies operating within the participating countries

may, at their discretion, choose to operate in either

legacy currencies or the euro until January 1, 2002.

The Company expects the majority of its affected

subsidiaries to continue to operate in their respective

legacy currencies during the next two years.  The

Company can, however, accommodate transactions for

customers and suppliers operating in either legacy

currency or euros.



The Company believes that the creation of the euro will

not significantly change its market risk with respect

to foreign exchange.  Having a common European currency

may result in certain changes to competitive practices,

product pricing and marketing strategies.  Although we

are unable to quantify these effects, if any,

management at this time does not believe the creation

of the euro will have a material effect on the Company.



ACQUISITION

In June 1997, the Company acquired the worldwide animal

health operations of Mallinckrodt Inc. for

approximately $490 million, which includes the

assumption of debt and direct costs of the acquisition.

The addition of the Mallinckrodt operations has created

broader product lines and expanded geographic

distribution capabilities for our animal health

products.  For additional information, see

"Acquisition" in the Notes to Consolidated Financial

Statements.



ENVIRONMENTAL MATTERS

The Company has obligations for environmental clean-up

under various state, local and federal laws, including

the Comprehensive Environmental Response, Compensation

and Liability Act, commonly known as Superfund.

Environmental expenditures have not had and, based on

information currently available, are not anticipated to

have a material impact on the Company.  For additional

information, see "Legal and Environmental Matters" in

the Notes to Consolidated Financial Statements.



ADDITIONAL FACTORS INFLUENCING OPERATIONS

In the United States, many of the Company's

pharmaceutical products are subject to increasingly

competitive pricing as managed care groups,

institutions, government agencies and other buying

groups seek price discounts.  In most international

markets, the Company operates in an environment of

government-mandated cost-containment programs.  Several

governments have placed restrictions on physician

prescription levels and patient reimbursements,

emphasized greater use of generic drugs and enacted

across-the-board price cuts as methods to control

costs.



Since the Company is unable to predict the final form

and timing of any future domestic and international

governmental or other health care initiatives, their

effect on operations and cash flows cannot be

reasonably estimated.  Similarly, the effect on

operations and cash flows of decisions of managed care

groups and other buying groups concerning formularies,

pharmaceutical reimbursement policies and availability

of the Company's pharmaceutical products cannot be

reasonably estimated.



The market for pharmaceutical products is competitive.

The Company's operations may be affected by

technological advances of competitors, industry

consolidation, patents granted to competitors, new

products of competitors and generic competition as the

Company's products mature.  In addition, patent

positions are increasingly being challenged by

competitors, and the outcome can be highly uncertain.

An adverse result in a patent dispute can preclude

commercialization of products or negatively affect

sales of existing products.  The effect on operations

of competitive factors and patent disputes cannot be

predicted.



Uncertainties inherent in government regulatory

approval processes, including, among other things,

delays in approval of new products, may also affect the

Company's operations.  The effect on operations of

regulatory approval processes cannot be predicted.



The Company is subject to the jurisdiction of various

national, state and local regulatory agencies and is,

therefore, subject to potential administrative actions.

Of particular importance is the Food and Drug

Administration (FDA) in the United States.  It has

jurisdiction over all the Company's businesses and

administers requirements covering the testing, safety,

effectiveness, approval, manufacturing, labeling and

marketing of the Company's products.  From time to

time, agencies, including the FDA, may require the

Company to address various manufacturing, advertising,

labeling or other regulatory issues.  Failure to comply

with governmental regulations can result in delays in

the release of products, seizure or recall of products,

suspension or revocation of the authority necessary for

the production and sale of products, fines and other

civil or criminal sanctions.



From time to time, the Company has received Warning

Letters from the FDA pertaining to various

manufacturing issues.  Among these, the Company has

received a Warning Letter from the FDA relating

specifically to manufacturing issues identified during

FDA inspections of the Company's aerosol products

(albuterol and VANCERIL) manufacturing facilities in

New Jersey.  The Company is implementing remedial

actions at these facilities.  The Company has met with

the FDA on several occasions to apprise the agency of

the scope and status of these activities.  An FDA

inspection of the Company's New Jersey manufacturing

facilities is ongoing.  The Company cannot predict

whether its remedial actions will resolve the FDA's

concerns, whether the FDA will take any further action

or the effect of this matter on the Company's

operations.



Under certain circumstances, the Company may deem it

advisable to initiate product recalls.  In 1999, the

Company voluntarily chose to initiate several recalls,

including a recall of certain shipments of albuterol

and VANCERIL manufactured at its New Jersey facilities.



LIQUIDITY AND FINANCIAL RESOURCES

Cash generated from operations continues to be the

Company's major source of funds to finance working

capital, capital expenditures, acquisitions,

shareholder dividends and common share repurchases.



Cash provided by operating activities totaled $1,893

million in 1999, $2,026 million in 1998 and $1,845

million in 1997.  Year-to-year changes in cash provided

by operating activities result from the timing of

receipts and disbursements as well as from an overall

net investment in working capital necessitated by the

growth in the business.



Capital expenditures amounted to $543 million in 1999,

$389 million in 1998 and $405 million in 1997.

Commitments for future capital expenditures totaled

$179 million at December 31, 1999.



Cash flow related to financing activities included

equity proceeds as well as proceeds from short-term

borrowings.    Common shares repurchased in 1999

totaled 9.9 million shares at a cost of $504 million.

In 1998, 3.4 million shares were repurchased for $141

million and, in 1997, 4.8 million shares were

repurchased at a cost of $132 million.



Dividend payments of $716 million were made in 1999,

compared with $627 million in 1998 and $542 million in

1997.  Dividends per common share were $0.485 in 1999,

up from $0.425 in 1998 and $0.368 in 1997.



Cash and cash equivalents totaled $1,876 million,

$1,259 million and $714 million at December 31, 1999,

1998 and 1997, respectively.  Short-term borrowings and

current portion of long-term debt totaled $728 million

at year-end 1999, $558 million in 1998 and $581 million

in 1997.



The Company's ratio of debt to total capital remained

at 12 percent in 1999. The Company's liquidity and

financial resources continued to be sufficient to meet

its operating needs.  As of December 31, 1999, the

Company had $1.2 billion in unused lines of credit,

including $876 million available under the $1 billion

multi-currency unsecured revolving credit facility

expiring in 2001.  The Company had A-1+ and P-1 ratings

for its commercial paper, and AA and Aa2 general bond

ratings from Standard & Poor's and Moody's,

respectively, as of December 31, 1999.



MARKET RISK DISCLOSURES

The Company is exposed to market risk primarily from

changes in foreign currency exchange rates and, to a

lesser extent, from interest rates.  The following

describes the nature of the risks and demonstrates

that, in general, such market risk is not material to

the Company.



Foreign Currency Exchange Risk

The Company operates in more than 40 countries

worldwide.  In 1999, sales outside the United States

accounted for approximately 36 percent of worldwide

sales.  Virtually all these sales were denominated in

currencies of the local country.  As such, the

Company's reported profits and cash flows are exposed

to changing exchange rates.  In 1999, changes in

foreign exchange rates reduced sales by less than 1

percent and had no impact on 1999 diluted earnings per

common share.



To date, management has not deemed it cost-effective to

engage in a formula-based program of hedging the

profits and cash flows of foreign operations using

derivative financial instruments.  Because the

Company's foreign subsidiaries purchase significant

quantities of inventory payable in U.S. dollars,

managing the level of inventory and related payables

and the rate of inventory turnover provides a level of

protection against adverse changes in exchange rates.

In addition, the risk of adverse exchange rate change

is mitigated by the fact that the Company's foreign

operations are widespread.  The widespread nature of

the Company's foreign operations is the primary reason

that the overall economic weakness in certain Latin

American countries is not expected to significantly

impact future operations of the Company.



In addition, at any point in time, the Company's

foreign subsidiaries hold financial assets and

liabilities that are denominated in currencies other

than U.S. dollars.  These financial assets and

liabilities consist primarily of short-term, third-

party and intercompany receivables and payables.

Changes in exchange rates affect these financial assets

and liabilities.  For the most part, however, gains or

losses arise from translation and, as such, do not

significantly affect net income.



On occasion, the Company has used derivatives to hedge

specific short-term risk situations involving foreign

currency exposures.  However, these derivative

transactions have not been material.



Interest Rate and Equity Price Risk

The financial assets of the Company that are exposed to

changes in interest rates and equity prices include

debt and equity securities held in non-qualified trusts

for employee benefits and equity securities acquired in

connection with in-licensing arrangements. The trust

investments totaled approximately $185 million at

December 31, 1999.  Due to the long-term nature of the

liabilities that these assets fund, the Company's

exposure to market risk is low.  A decline in market

value of these investments would not necessitate any

near-term funding of the trusts.  In connection with

certain research and development in- licensing

arrangements, on occasion the Company acquires equity

securities of the licensee company.  These investments

are generally accounted for as available-for-sale and,

as such, carried at market value.  The total market

value of these investments at December 31, 1999, was

$119 million. See "Financial Instruments" in the Notes

to Consolidated Financial Statements for additional

information.  The other financial assets of the Company

do not give rise to significant interest rate risk due

to their short duration.



The financial obligations of the Company that are

exposed to changes in interest rates are generally

limited to short-term borrowings and a $200 million

equity-type security issued in 1999. All other

borrowings are not significant.  Although the

borrowings are, for the most part, floating rate

obligations, the interest rate risk posed by these

borrowings is low because the amount of this obligation

is small in relation to annual cash flow.  The Company

has the ability to pay off these borrowings quickly if

interest rates were to increase significantly.



Interest Rate Swaps

In 1991 and 1992, the Company utilized interest rate

swaps as part of its international cash management

strategy.  For additional information, see "Financial

Instruments" in the Notes to Consolidated Financial

Statements.  These swaps subject the Company to a

moderate degree of market risk.  The Company accounts

for these swaps using fair value accounting, with

changes in the fair value recorded in earnings.  The

fair value of these swaps was an asset of $1 million at

December 31, 1999.  The fair value of these swaps at

December 31, 1998, was less than $100 thousand.  It is

estimated that a 10 percent change in interest rate

structure could change the fair value of the swaps by

approximately $2 million.



During 1999, the Company purchased a $200 million

variable rate, three-month time deposit.  The Company

intends to roll over this time deposit every three

months until November 2003.  To hedge the future

variable interest receipts on this time deposit, the

Company entered into an interest rate swap that matures

in November 2003.  Under this swap, the Company

receives a fixed rate and pays a three-month variable

rate.  The fair value of this swap was a $6 million

liability at December 31, 1999.  It is estimated that a

10 percent change in interest rate structure could

change the fair value of the swap by approximately $5

million.



CAUTIONARY FACTORS THAT MAY AFFECT FUTURE RESULTS

This annual report and other written reports and oral

statements made from time to time by the Company may

contain so-called "forward-looking statements," all of

which are subject to risks and uncertainties.  One can

identify these forward-looking statements by the use of

such words as "expects," "plans," "will," "estimates,"

"forecasts," "projects," "believes" and other words of

similar meaning.  One also can identify them by the

fact that they do not relate strictly to historical or

current facts.  These statements are likely to address

the Company's growth strategy, financial results,

regulatory issues, product approvals, development

programs, litigation and investigations.  One must

carefully consider any such statement and should

understand that many factors could cause actual results

to differ from the Company's forward-looking

statements.  These factors include inaccurate

assumptions and a broad variety of other risks and

uncertainties, including some that are known and some

that are not.  No forward-looking statement can be

guaranteed, and actual future results may vary

materially.



The Company does not assume the obligation to update

any forward-looking statement.  One should carefully

evaluate such statements in light of factors described

in the Company's filings with the Securities and

Exchange Commission, especially on Forms 10-K, 10-Q and

8-K (if any).  In Item 1 of the Company's annual report

on Form 10-K for the year ended December 31, 1999, the

Company discusses in more detail various important

factors that could cause actual results to differ from

expected or historic results.  The Company notes these

factors for investors as permitted by the Private

Securities Litigation Reform Act of 1995.  One should

understand that it is not possible to predict or

identify all such factors.  Consequently, the reader

should not consider any such list to be a complete

statement of all potential risks or uncertainties.












SCHERING-PLOUGH CORPORATION AND SUBSIDIARIES

<TABLE>
STATEMENTS OF CONSOLIDATED INCOME
(Amounts in millions, except per share figures)
<CAPTION>

For the Years Ended December 31,                          1999      1998      1997
<S>                                                     <C>       <C>       <C>
Net sales . . . . . . . . . . . . . . . . . . .         $9,176    $8,077    $6,778

Costs and Expenses:

   Cost of sales  . . . . . . . . . . . . . . .          1,800     1,601     1,308
   Selling, general and administrative. . . . .          3,434     3,141     2,664
   Research and development . . . . . . . . . .          1,191     1,007       847
   Other (income) expense, net. . . . . . . . .            (44)        2        46
   Total costs and expenses . . . . . . . . . .          6,381     5,751     4,865

Income before income taxes  . . . . . . . . . .          2,795     2,326     1,913
      Income taxes  . . . . . . . . . . . . . .            685       570       469

Net income. . . . . . . . . . . . . . . . . . .         $2,110    $1,756    $1,444

Diluted earnings per common share . . . . . . .          $1.42    $ 1.18      $.97

Basic earnings per common share . . . . . . . .          $1.44    $ 1.20      $.98

See Notes to Consolidated Financial Statements.
</TABLE>






SCHERING-PLOUGH CORPORATION AND SUBSIDIARIES

<TABLE>

STATEMENTS OF CONSOLIDATED CASH FLOWS
(Amounts in millions)

<CAPTION>

For the Years Ended December 31,                        1999        1998        1997
<S>                                                    <C>         <C>         <C>
Operating Activities:

  Net income . . . . . . . . . . . . . . . . . . .     $2,110      $1,756      $1,444
  Depreciation and amortization  . . . . . . . . .        264         238         200
  Accounts receivable  . . . . . . . . . . . . . .       (352)        (67)        (40)
  Inventories  . . . . . . . . . . . . . . . . . .       (150)       (102)        (43)
  Prepaid expenses and other assets. . . . . . . .        (76)       (116)       (127)
  Accounts payable and other liabilities . . . . .         97         317         411

  Net cash provided by operating activities  . . .      1,893       2,026       1,845

Investing Activities:

  Capital expenditures . . . . . . . . . . . . . .       (543)       (389)       (405)
  Purchases of investments . . . . . . . . . . . .       (338)       (319)        (77)
  Reduction of investments . . . . . . . . . . . .        215           -          36
  Purchase of business, net of cash acquired . . .          -           -        (354)
  Other, net . . . . . . . . . . . . . . . . . . .          3           -          (8)

  Net cash used for investing activities . . . . .       (663)       (708)       (808)

Financing Activities:

  Cash dividends paid to common shareholders . . .       (716)       (627)       (542)
  Common shares repurchased  . . . . . . . . . . .       (504)       (141)       (132)
  Net change in short-term borrowings  . . . . . .        187         (19)       (290)
  Repayment of long-term debt  . . . . . . . . . .         (2)        (42)         (1)
  Other, net, primarily equity proceeds. . . . . .        424          57         116

  Net cash used for financing activities . . . . .       (611)       (772)       (849)

Effect of exchange rates on cash and cash equivalents      (2)         (1)         (9)

Net increase in cash and cash equivalents  . . . .        617         545         179

Cash and cash equivalents, beginning of year . . .      1,259         714         535

Cash and cash equivalents, end of year . . . . . .     $1,876      $1,259       $ 714

See Notes to Consolidated Financial Statements.

</TABLE>






SCHERING-PLOUGH CORPORATION AND SUBSIDIARIES

<TABLE>

CONSOLIDATED BALANCE SHEETS
(Amounts in millions, except per share figures)

<CAPTION>

At December 31,                                          1999         1998
<S>                                                     <C>          <C>
ASSETS

Current Assets:

     Cash and cash equivalents . . . . . . . .          $1,876       $1,259

     Accounts receivable, less allowances:
      1999, $92; 1998, $98 . . . . . . . . . .           1,022          704

     Inventories   . . . . . . . . . . . . . .             958          841

     Prepaid expenses, deferred income taxes
      and other current assets . . . . . . . .           1,053        1,154

     Total current assets  . . . . . . . . . .           4,909        3,958

Property, at cost:

     Land    . . . . . . . . . . . . . . . . .              50           48

     Buildings and improvements  . . . . . . .           1,922        1,836

     Equipment . . . . . . . . . . . . . . . .           1,760        1,677

     Construction in progress  . . . . . . . .             654          507


     Total . . . . . . . . . . . . . . . . . .           4,386        4,068

     Less accumulated depreciation . . . . . .           1,447        1,393

     Property, net . . . . . . . . . . . . . .           2,939        2,675

Intangible assets, net . . . . . . . . . . . .             588          565

Other assets . . . . . . . . . . . . . . . . .             939          642

                                                        $9,375       $7,840



                                                            1999       1998

LIABILITIES AND SHAREHOLDERS' EQUITY

Current Liabilities:

   Accounts payable  . . . . . . . . . . . . . . . . .    $  966     $1,003

   Short-term borrowings and current portion of
    long-term debt   . . . . . . . . . . . . . . . . .       728        558

   U.S., foreign and state income taxes  . . . . . . .       502        505

   Accrued compensation  . . . . . . . . . . . . . . .       301        279

   Other accrued liabilities . . . . . . . . . . . . .       712        687

   Total current liabilities . . . . . . . . . . . . .     3,209      3,032

Long-term Liabilities:

   Deferred income taxes . . . . . . . . . . . . . . .       284        291

   Other long-term liabilities . . . . . . . . . . . .       717        515

   Total long-term liabilities . . . . . . . . . . . .     1,001        806

Shareholders' Equity:

   Preferred shares - authorized shares: 50,
    $1 par value; issued: none . . . . . . . . . . . .         -          -

   Common shares - authorized shares:
    2,400, $.50 par value; issued: 2,030 . . . . . . .     1,015      1,015

   Paid-in capital . . . . . . . . . . . . . . . . . .       675        365

   Retained earnings . . . . . . . . . . . . . . . . .     8,196      6,802

   Accumulated other comprehensive income  . . . . . .      (233)      (238)

   Total . . . . . . . . . . . . . . . . . . . . . . .     9,653      7,944

   Less treasury shares: 558, at cost  . . . . . . . .     4,488      3,942

   Total shareholders' equity  . . . . . . . . . . . .     5,165      4,002

                                                          $9,375     $7,840

See Notes to Consolidated Financial Statements.

</TABLE>






SCHERING-PLOUGH CORPORATION AND SUBSIDIARIES

<TABLE>

STATEMENTS OF CONSOLIDATED SHAREHOLDERS' EQUITY
(Amounts in millions)
<CAPTION>
                                                                  Accumulated
                                                                       Other        Total
                                                                       Compre-      Share-
                              Common    Paid-in   Retained   Treasury  hensive      holders'
                              Shares    Capital   Earnings   Shares    Income       Equity
<S>                             <C>       <C>      <C>       <C>        <C>         <C>
Balance December 31, 1996       $507      $172     $5,081    $(3,560)   $(140)      $2,060

Comprehensive income:
 Net income                                         1,444                            1,444
 Foreign currency translation,
  net of tax                                                             (101)        (101)
 Unrealized gain (loss) on
  investments held available
  for sale, net                                                            (3)          (3)
   Total comprehensive income                                                        1,340
Cash dividends on common
  shares                                             (542)                            (542)
Stock incentive plans                      122                   (27)                   95
Common shares repurchased                                       (132)                 (132)
Effect of 2-for-1 stock split    508      (198)      (310)

Balance December 31, 1997      1,015        96      5,673     (3,719)    (244)       2,821

Comprehensive income:
 Net income                                         1,756                            1,756
 Foreign currency translation,
  net of tax                                                                5            5
 Unrealized gain (loss) on
  investments held available
  for sale, net                                                             1            1
   Total comprehensive income                                                        1,762
Cash dividends on common
  shares                                             (627)                            (627)
Stock incentive plans                      269                   (82)                  187
Common shares repurchased                                       (141)                 (141)

Balance December 31, 1998      1,015       365      6,802     (3,942)    (238)       4,002


Comprehensive income:
 Net income                                         2,110                            2,110
 Foreign currency translation,
  net of tax                                                              (54)         (54)
 Unrealized gain (loss) on
  investments held available
  for sale, net                                                            59           59
   Total comprehensive income                                                        2,115
Cash dividends on common
  shares                                             (716)                            (716)
Stock incentive plans                      310                   (42)                  268
Common shares repurchased                                       (504)                 (504)
Balance December 31, 1999     $1,015      $675     $8,196    $(4,488)  $ (233)      $5,165

See Notes to Consolidated Financial Statements.

</TABLE>






NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
(Dollars in millions, except per share figures)

ACCOUNTING POLICIES

Principles of Consolidation - The consolidated
financial statements include Schering-Plough
Corporation and its subsidiaries.  Intercompany
balances and transactions are eliminated.  Certain
prior year amounts have been reclassified to conform to
the current year presentation.

Use of Estimates - The preparation of financial
statements in conformity with generally accepted
accounting principles requires management to make
estimates and use assumptions that affect certain
reported amounts and disclosures; actual amounts may
differ.

Cash and Cash Equivalents - Cash and cash equivalents
include operating cash and highly liquid investments,
generally with maturities of three months or less.

Inventories - Inventories are valued at the lower of
cost or market.  Cost is determined by using the last-
in, first-out method for a substantial portion of
inventories located in the United States.  The cost of
all other inventories is determined by the first-in,
first-out method.

Depreciation - Depreciation is provided over the
estimated useful lives of the properties, generally by
use of the straight-line method.  Average useful lives
are 50 years for buildings, 25 years for building
improvements and 12 years for equipment.  Depreciation
expense was $208, $191 and $166 in 1999, 1998 and 1997,
respectively.

Intangible Assets - Intangible assets principally
include goodwill, licenses, patents and trademarks.
Intangible assets are recorded at cost and amortized on
the straight-line method over periods not exceeding 40
years.  Accumulated amortization of intangible assets
was $188 and $138 at December 31, 1999 and 1998,
respectively.  Intangible assets are periodically
reviewed to determine recoverability by comparing their
carrying values to undiscounted expected future cash
flows.

Foreign Currency Translation - The net assets of most
of the Company's foreign subsidiaries are translated
into U.S. dollars using current exchange rates.  The
U.S. dollar effects that arise from translating the
net assets of these subsidiaries at changing rates are
recorded in the foreign currency translation adjustment
account, which is included in other comprehensive
income.  For the remaining foreign subsidiaries,
non-monetary assets and liabilities are translated
using historical rates, while monetary assets and
liabilities are translated at current rates, with the
U.S. dollar effects of rate changes included in income.
Exchange gains and losses arising from translating
intercompany balances of a long-term investment nature
are recorded in the foreign currency translation
adjustment account.  Other exchange gains and losses
are included in income.

Net foreign exchange losses included in income were $6,
$2 and $6 in 1999, 1998 and 1997, respectively.

Accumulated Other Comprehensive Income - Accumulated
other comprehensive income consists of the accumulated
foreign currency translation adjustment account and
accumulated unrealized gains and losses on securities
classified for Statement of Financial Accounting
Standards (SFAS) No. 115 purposes as held available for
sale. At December 31, 1999 and 1998, the accumulated
foreign currency translation adjustment account, net of
tax, totaled $301 and $247, respectively.

Revenue Recognition - Revenues from the sale of
products are recorded at the time goods are shipped to
customers.

Earnings Per Common Share -  Diluted earnings per
common share are computed by dividing income by the sum
of the weighted-average number of common shares
outstanding plus the dilutive effect of shares issuable
through deferred stock units and the exercise of stock
options.  Basic earnings per common share are computed
by dividing income by the weighted-average number of
common shares outstanding.

The shares used to calculate basic earnings per common
share and diluted earnings per common share are
reconciled as follows:

<TABLE>
<CAPTION>
                                                     (shares in millions)
                                                   1999       1998      1997
<S>                                                <C>       <C>       <C>
Average shares outstanding
  for basic earnings per share . . . .             1,470     1,468     1,464

Dilutive effect of options
  and deferred stock units . . . . . .                16        20        16

Average shares outstanding
  for diluted earnings per share . . .             1,486     1,488     1,480

</TABLE>

As of December 31, 1999, there were 9 million options
outstanding with exercise prices higher than the
average price of the Company's common stock during
1999.  Accordingly, these options are not included in
the dilutive effects indicated above.


Recently Issued Accounting Standard - In June 1998, the
Financial Accounting Standards Board (FASB) issued SFAS
No. 133, "Accounting for Derivative Instruments and
Hedging Activities."  SFAS No. 133, as amended by SFAS
No. 137, requires adoption by the Company no later than
January 1, 2001.  The Company plans to adopt SFAS No.
133 at that time.  This statement is not expected to
materially impact the Company's financial statements
because the Company makes limited use of derivative
financial instruments.

ACQUISITION

On June 30, 1997, the Company acquired the worldwide
animal health business of Mallinckrodt Inc. for
approximately $490, which includes the assumption of
debt and direct costs of the acquisition.  The
acquisition was recorded under the purchase method of
accounting.  The excess of the purchase price over the
fair value of identifiable net assets acquired is
included in intangible assets, net.  The results of
operations of the purchased animal health business have
been included in the Company's Statements of
Consolidated Income from the date of acquisition.  Pro
forma results of the Company, assuming the acquisition
had been made at the beginning of each period
presented, would not be materially different from the
results reported.

FINANCIAL INSTRUMENTS

The table below presents the carrying values and
estimated fair values for the Company's financial
instruments, including derivative financial
instruments.  Estimated fair values were determined
based on market prices, where available, or dealer
quotes.

<TABLE>
<CAPTION>
                                 December 31, 1999        December 31, 1998
                               Carrying    Estimated    Carrying  Estimated
                                Value     Fair Value     Value   Fair Value
<S>                             <C>          <C>         <C>       <C>
ASSETS:
Cash and cash equivalents       $1,876       $1,876      $1,259    $1,259
Debt and equity investments        532          532         213       213
Interest rate swap contracts         6           (6)          -         -

LIABILITIES:
Short-term borrowings and
  current portion of long-
  term debt                        728          728         558       558
Long-term debt                       6            6           4         4
Other financing instruments        208          193           -         -

</TABLE>

Credit and Market Risk

Most financial instruments expose the holder to credit
risk for non-performance and to market risk for changes
in interest and currency rates.  The Company mitigates
credit risk on derivative instruments by dealing only
with financially sound counterparties.  Accordingly,
the Company does not anticipate loss for non-
performance.  The Company does not enter into
derivative instruments to generate trading profits.
Refer to "Market Risk Disclosures" in Management's
Discussion and Analysis of Operations and Financial
Condition for a discussion regarding the market risk of
the Company's financial instruments.

Debt and Equity Investments

Investments, which are primarily included in other non-
current assets, consist of a time deposit, equity
securities of licensee companies and debt and equity
securities held in non-qualified trusts to fund benefit
obligations. Investments are primarily classified as
available for sale and are carried at fair value, with
unrealized gains and losses, net of tax, reported in
other comprehensive income.  Gross unrealized gains in
1999 were $59; gross unrealized losses in 1999 were not
material. Gross unrealized gains and losses in 1998 and
1997 were not material.

Interest Rate Swap Contracts

In 1991 and 1992, the Company utilized interest rate
swaps as part of its international cash management
strategy.  The notional principal of the 1991
arrangement is $650 and the notional principal of the
1992 arrangement is $950.  Both arrangements have 20-
year terms.  At December 31, 1999, the arrangements
provide for the payment of interest based upon LIBOR
and the receipt of interest based upon an annual
election of various floating rates.  As a result, the
Company remains subject to a moderate degree of market
risk through maturity of the swaps.  These interest
rate swaps are recorded at fair value, with changes in
fair value recorded in earnings.  Annual net cash flows
for payments and receipts under these interest rate
swap contracts are not material.  The net asset or
liability under these interest rate swaps is recorded
in other current assets or other accrued liabilities,
as applicable.

To hedge future variable interest receipts on a $200
time deposit purchased in 1999, the Company entered
into an interest rate swap that matures in November
2003.  Under the swap, the Company will receive 5.6
percent on a notional principal of $200 and will pay
three-month LIBOR.  The differential paid or earned on
this interest rate swap has been designated as a hedge
and is reflected as an adjustment to interest income
over the life of the swap.

COMMITMENTS

Total rent expense amounted to $65 in 1999, $58 in 1998
and $44 in 1997.  Future minimum rental commitments on
non-cancelable operating leases as of December 31,
1999, range from $31 in 2000 to $7 in 2004, with
aggregate minimum lease obligations of $20 due
thereafter.  The Company has commitments related to
future capital expenditures totaling $179 as of
December 31, 1999.

BORROWINGS

The Company has a $1 billion committed, multi-currency
unsecured revolving credit facility expiring in 2001
from a syndicate of financial institutions.  This
facility is available for general corporate purposes
and is considered as support for the Company's
commercial paper borrowings.  This line of credit does
not require compensating balances; however, a nominal
commitment fee is paid.  At December 31, 1999, $124 had
been drawn down under this facility.  In addition, the
Company's foreign subsidiaries had available $314 in
unused lines of credit from various financial
institutions at December 31, 1999.  Generally, these
foreign credit lines do not require commitment fees or
compensating balances and are cancelable at the option
of the Company or the financial institutions.

Short-term borrowings consist of commercial paper
issued in the United States, bank loans, notes payable
and amounts drawn down under the revolving credit
facility.  Commercial paper outstanding at December 31,
1999 and 1998 was $495 and $339, respectively.  The
weighted-average interest rate for short-term
borrowings at December 31, 1999 and 1998 was 6.9
percent and 5.7 percent, respectively.

The Company has a shelf registration statement on file
with the Securities and Exchange Commission covering
the issuance of up to $200 of debt securities.  The
terms of these securities will be determined at the
time of sale.  As of December 31, 1999, no debt
securities have been issued pursuant to this
registration.

FINANCING

During 1999, a subsidiary of the Company issued $200 of
equity-type securities.  The securities bear a LIBOR-
based yield that is substantially fixed through
November 28, 2003; thereafter, the Company can elect to
reset the rate annually or substantially fix the rate
for the next five years. At December 31, 1999, the rate
was 5.6 percent.  The Company can call the securities
at any time after November 30, 2004, or earlier under
certain circumstances.  The holders can put the
securities back to the Company at any time after
November 30, 2027, or earlier under certain
circumstances.  Because of the put and call features,
this obligation is included in other long-term
liabilities.

INTEREST COSTS AND INCOME

<TABLE>

Interest costs were as follows:
<CAPTION>
                                             1999     1998     1997
<S>                                           <C>      <C>      <C>
Interest cost incurred . . . . . . . .        $41      $28      $55
Less:  amount capitalized on
        construction . . . . . . . . .         12        9       15

Interest expense . . . . . . . . . . .        $29      $19      $40

Cash paid for interest, net of
  amount capitalized  . . . . .  . . .        $28      $19      $37

</TABLE>

Interest income for 1999, 1998 and 1997 was $103, $59
and $56, respectively.  Interest income and interest
expense are included in other (income) expense, net.

SHAREHOLDERS' EQUITY

On September 22, 1998, the Board of Directors voted to
increase the number of authorized common shares from
1.2 billion to 2.4 billion and approved a 2-for-1 stock
split.  Distribution of the split shares was made on
December 2, 1998.  On April 22, 1997, the Board of
Directors voted to increase the number of authorized
common shares from 600 million to 1.2 billion and
approved a 2-for-1 stock split.  Distribution of these
split shares was made on June 3, 1997.  All per share
amounts herein have been adjusted to reflect both stock
splits.

<TABLE>
A summary of treasury share transactions follows
(shares in millions):
<CAPTION>
                                         1999         1998         1997
<S>                                       <C>          <C>          <C>
Share balance at January 1                558          282          142
  Shares issued under stock
     incentive plans                      (10)          (9)          (4)
  Purchase of treasury shares              10            3            2
  Effect of 2-for-1 stock split             -          282          142
Share balance at December 31              558          558          282

</TABLE>

The Company has Preferred Share Purchase Rights
outstanding that are attached to, and presently only
trade with, the Company's common shares and are not
exercisable.  The rights will become exercisable only
if a person or group acquires 20 percent or more of the
Company's common stock or announces a tender offer
which, if completed, would result in ownership by a
person or group of 20 percent or more of the Company's
common stock.  Should a person or group acquire 20
percent or more of the Company's outstanding common
stock through a merger or other business combination
transaction, each right will entitle its holder (other
than such acquirer) to purchase common shares of
Schering-Plough having a market value of twice the
exercise price of the right.  The exercise price of the
rights is $100.

Following the acquisition by a person or group of
beneficial ownership of 20 percent or more but less
than 50 percent of the Company's common stock, the
Board of Directors may call for the exchange of the
rights (other than rights owned by such acquirer), in
whole or in part, at an exchange ratio of one common
share or one two-hundredth of a share of Series A
Junior Participating Preferred Stock, per right.  Also,
prior to the acquisition by a person or group of
beneficial ownership of 20 percent or more of the
Company's common stock, the rights are redeemable for
$.005 per right at the option of the Board of
Directors.  The rights will expire on July 10, 2007,
unless earlier redeemed or exchanged.  The Board of
Directors is also authorized to reduce the 20 percent
thresholds referred to above to not less than the
greater of (i) the sum of .001 percent and the largest
percentage of the outstanding shares of common stock
then known to the Company to be beneficially owned by
any person or group of affiliated or associated persons
and (ii) 10 percent, except that following the
acquisition by a person or group of beneficial
ownership of 20 percent or more of the Company's common
stock no such reduction may adversely affect the
interests of the holders of the rights.

STOCK INCENTIVE PLANS

Under the terms of the Company's 1997 Stock Incentive
Plan, 72 million of the Company's common shares may be
granted as stock options or awarded as deferred stock
units to officers and certain employees of the Company
through December 2002.  Option exercise prices equal
the market price of the common shares at their grant
dates.  Options expire not later than 10 years after
the date of grant.  Standard options granted generally
have a one-year vesting term.  Other options granted
vest 20 percent per year for five years starting five
years after the date of grant.  Deferred stock units
are payable in an equivalent number of common shares;
the shares are distributable in a single installment or
in five equal annual installments generally commencing
one year from the date of the award.

<TABLE>

The following table summarizes stock option activity
over the past three years under the current and prior
plans (number of options in millions):

<CAPTION>
                           1999                   1998                   1997
                               Weighted-             Weighted-             Weighted-
                    Number     Average    Number     Average    Number     Average
                      Of       Exercise     of       Exercise     of       Exercise
                    Options    Price      Options    Price      Options    Price
<S>                   <C>     <C>          <C>       <C>           <C>      <C>
Outstanding at
 January 1. . . .     42      $19.31        42       $12.20        41       $ 9.57
  Granted . . . .      9       52.86        11        39.06         9        20.57
  Exercised . . .     (8)      13.96       (10)       10.47        (8)        7.76
  Canceled
  or expired. . .     (1)      32.79        (1)       30.87         -            -
Outstanding at
  December 31 . .     42      $27.34        42       $19.31        42       $12.20
Options exercisable
 at December 31 .     27      $21.16        25       $12.02        26       $ 9.28

</TABLE>

The Company accounts for its stock compensation
arrangements using the intrinsic value method.  If the
fair value method of accounting was applied as defined
in SFAS No. 123, "Accounting for Stock-Based
Compensation," the Company's pro forma net income would
have been $2,044, $1,704 and $1,421 for 1999, 1998 and
1997, respectively. Pro forma diluted earnings per
share would have been $1.38, $1.15 and $.96 for 1999,
1998 and 1997, respectively, and pro forma basic
earnings per share would have been $1.39, $1.16 and
$.97 for 1999, 1998 and 1997, respectively.

<TABLE>

The weighted-average fair value per option granted in
1999, 1998 and 1997 was $12.38, $9.24 and $4.60,
respectively.  The fair values were estimated using the
Black-Scholes option pricing model based on the
following assumptions:

<CAPTION>
                                            1999       1998      1997
          <S>                               <C>        <C>       <C>
          Dividend yield                    2.2%       2.4%      2.6%
          Volatility                         23%        24%       20%
          Risk-free interest rate           5.1%       5.5%      6.1%
          Expected term of options (in years) 5          5         5

</TABLE>

In 1999, 1998 and 1997, the Company awarded deferred
stock units totaling 2.4 million, 2.5 million and 3.0
million, respectively.  The expense recorded in 1999,
1998 and 1997 for deferred stock units was $61, $45 and
$32, respectively.

INVENTORIES

<TABLE>

Year-end inventories consisted of the following:

<CAPTION>
                                                    1999    1998
<S>                                                 <C>     <C>
Finished products. . . . . . . . . . . . . .        $437    $483
Goods in process . . . . . . . . . . . . . .         267     174
Raw materials and supplies . . . . . . . . .         254     184

Total inventories  . . . . . . . . . . . . .        $958    $841

</TABLE>

Inventories valued on a last-in, first-out basis
comprised approximately 31 percent and 28 percent of
total inventories at December 31, 1999 and 1998,
respectively.  The estimated replacement cost of total
inventories at December 31, 1999 and 1998 was $972 and
$864, respectively.

RETIREMENT PLANS AND OTHER POST-RETIREMENT BENEFITS

The Company has defined benefit pension plans covering
eligible employees in the United States and certain
foreign countries, and the Company provides post-
retirement health care benefits to its eligible U.S.
retirees and their dependents.

<TABLE>

The components of net pension and other post-retirement
benefit (income) expense were as follows:

<CAPTION>

                                                                Post-retirement
                                                                  Health Care
                                            Retirement Plans        Benefits
                                            1999  1998  1997    1999  1998  1997
<S>                                           <C>    <C>    <C>       <C>    <C>
<C>
Service cost                                 $42   $41   $37      $5    $5    $4
Interest cost                                 62    59    54      11    11    11
Expected  return  on plan assets            (101)  (89)  (81)    (18)  (17)  (15)
Amortization,  net                            (5)   (6)   (5)     (2)   (1)   (1)

Net                                          $(2)   $5    $5     $(4)  $(2)  $(1)

</TABLE>

<TABLE>

The components of the changes in the benefit
obligations were as follows:

<CAPTION>
                                                            Post-retirement
                                                              Health Care
                                          Retirement Plans     Benefits
                                            1999    1998      1999    1998
<S>                                         <C>     <C>       <C>     <C>
Benefit obligations at January 1. . . .     $987    $867      $177    $162
Service cost  . . . . . . . . . . . . .       42      41         5       5
Interest cost . . . . . . . . . . . . .       62      59        11      11
Assumption changes. . . . . . . . . . .     (101)     51       (20)     10
Effects of exchange rate changes. . . .       (9)      5         -       -
Benefits paid . . . . . . . . . . . . .      (41)    (62)      (11)     (8)
Actuarial (gains) and losses  . . . . .       22      22         8      (3)
Plan amendments . . . . . . . . . . . .        6       4         -       -
Benefit obligations at December 31. . .     $968    $987      $170    $177

Benefit obligations of overfunded plans     $740    $790      $170    $177
Benefit obligations of underfunded plans     228     197

</TABLE>

<TABLE>

The components of the changes in plan assets were as
follows:

<CAPTION>
                                                            Post-retirement
                                                              Health Care
                                          Retirement Plans       Benefits
                                            1999    1998      1999    1998
<S>                                       <C>     <C>         <C>     <C>
Fair value of plan assets, primarily
 stocks and bonds, at January 1 . . . .   $1,145  $1,039      $228    $210
Actual return on plan assets  . . . . .      188     135        42      26
Contributions . . . . . . . . . . . . .       14      13         -       -
Effects of exchange rate changes  . . .       (9)      -         -       -
Benefits paid  . . .  . . . . . . . . .      (39)    (42)      (11)     (8)
Fair value of plan assets at December 31  $1,299  $1,145      $259    $228

Plan assets of overfunded plans           $1,219  $1,086      $259    $228
Plan assets of underfunded plans              80      59

</TABLE>

In addition to the plan assets indicated above, at
December 31, 1999 and 1998, securities of $79 and $70,
respectively, were held in non-qualified trusts
designated to provide pension benefits for certain
underfunded plans.

<TABLE>

The following is a reconciliation of the funded status
of the plans to the Company's balance sheet at December
31:

<CAPTION>
                                                             Post-retirement
                                                               Health Care
                                         Retirement Plans        Benefits
                                          1999    1998         1999     1998
<S>                                        <C>     <C>         <C>       <C>
Plan assets in excess of benefit
 obligations  . . . . . . . . . . . . .    $331    $158        $89       $51
Unrecognized net transition asset . . .     (37)    (45)         -         -
Unrecognized prior service costs. . . .      16      12         (5)       (6)
Unrecognized net actuarial (gain) . . .    (189)    (14)       (85)      (51)
Net asset (liability) . . . . . . . . .    $121    $111        $(1)      $(6)

</TABLE>

<TABLE>

The weighted-average assumptions employed at December
31, 1999 and 1998 were:

<CAPTION>
                                                            Post-retirement
                                                              Health Care
                                          Retirement Plans       Benefits
                                            1999    1998      1999    1998
<S>                                          <C>     <C>       <C>     <C>
Discount rate                                7.0%    6.6%      7.5%    6.5%
Long-term expected rate of return on
 plan assets                                 9.5%    9.9%      9.0%    9.0%
Rate of increase in future compensation      3.9%    4.1%

</TABLE>

The weighted-average assumed health care cost trend
rates used for post-retirement measurement purposes
were 6.6 percent for 2000, trending down to 5.0 percent
by 2002.  A 1 percent increase or decrease in the
assumed health care cost trend rate would increase or
decrease combined post-retirement service and interest
cost by $3 and the post-retirement benefit obligation
by $24.

The Company has a defined contribution profit-sharing
plan covering substantially all its full-time domestic
employees who have completed one year of service.  The
annual contribution is determined by a formula based on
the Company's income, shareholders' equity and
participants' compensation.  Profit-sharing expense
totaled $74, $66 and $58 in 1999, 1998 and 1997,
respectively.

INCOME TAXES

<TABLE>

U.S. and foreign operations contributed to income
before income taxes as follows:

<CAPTION>
                                                  1999      1998      1997
<S>                                             <C>       <C>       <C>
United States . . . . . . . . . . . . . . . .   $2,031    $1,609    $1,349
Foreign . . . . . . . . . . . . . . . . . . .      764       717       564

Total income before income taxes. . . . . . .   $2,795    $2,326    $1,913

</TABLE>

<TABLE>

The components of income tax expense were as follows:

<CAPTION>
                                                  1999      1998     1997
<S>                                               <C>       <C>      <C>
Current:
  Federal. . . . . . . . . . . . . . . . .        $464      $442     $306
  Foreign  . . . . . . . . . . . . . . . .         185       184      160
  State. . . . . . . . . . . . . . . . . .          13        14       10

  Total current. . . . . . . . . . . . . .         662       640      476

Deferred:
  Federal and state. . . . . . . . . . . .          46       (19)      30
  Foreign. . . . . . . . . . . . . . . . .         (23)      (51)     (37)

  Total deferred . . . . . . . . . . . . .          23       (70)      (7)

Total income tax expense . . . . . . . . .        $685      $570     $469

</TABLE>

<TABLE>

The difference between the U.S. statutory tax rate and
the Company's effective tax rate was due to the
following:

<CAPTION>
                                                  1999    1998    1997
<S>                                               <C>     <C>     <C>
U.S. statutory tax rate. . . . . . . . . .        35.0%   35.0%   35.0%
Increase (decrease) in taxes resulting
 from:
  Lower rates in other jurisdictions,
   net . . . . . . . . . . . . . . . . . .       (10.5)  (10.6)  (10.0)
  Research tax credit  . . . . . . . . . .         (.8)    (.8)    (.6)
  All other, net . . . . . . . . . . . . .          .8      .9      .1

Effective tax rate . . . . . . . . . . . .        24.5%   24.5%   24.5%

</TABLE>

The lower rates in other jurisdictions, net, are
primarily attributable to certain employment and
capital investment actions taken by the Company.  As a
result, income from manufacturing activities in these
jurisdictions is subject to lower tax rates through
2018.

As of December 31, 1999 and 1998, the Company had total
deferred tax assets of $733 and $741, respectively, and
deferred tax liabilities of $521 and $506,
respectively.  Valuation allowances are not
significant.  Significant deferred tax assets at
December 31, 1999 and 1998 were for operating costs not
currently deductible for tax purposes and totaled $389
and $425, respectively.  Significant deferred tax
liabilities at December 31, 1999 and 1998 were for
depreciation differences, $222 and $233, respectively,
and retirement plans, $67 and $61, respectively.  Other
current assets include deferred income taxes of $507
and $521 at December 31, 1999 and 1998, respectively.

Deferred taxes are not provided on undistributed
earnings of foreign subsidiaries (considered to be
permanent investments), which at December 31, 1999,
approximated $5,020.  Determining the tax liability
that would arise if these earnings were remitted is not
practicable.

As of December 31, 1999, the U.S. Internal Revenue
Service has completed its examination of the Company's
tax returns for all years through 1988, and there are
no unresolved issues outstanding for those years.

Total income tax payments during 1999, 1998 and 1997
were $502, $458 and $368, respectively.

LEGAL AND ENVIRONMENTAL MATTERS

The Company has responsibilities for environmental
cleanup under various state, local and federal laws,
including the Comprehensive Environmental Response,
Compensation and Liability Act, commonly known as
Superfund.  At several Superfund sites (or equivalent
sites under state law), the Company is alleged to be a
potentially responsible party (PRP).  The Company
estimates its obligations for cleanup costs for
Superfund sites based on information obtained from the
federal Environmental Protection Agency, an equivalent
state agency, and/or studies prepared by independent
engineers, and on the probable costs to be paid by
other PRPs.  The Company records a liability for
environmental assessments and/or cleanup when it is
probable a loss has been incurred and the amount can
reasonably be estimated.

The Company is also involved in various other claims
and legal proceedings of a nature considered normal to
its business, including product liability cases.  The
estimated costs the Company expects to pay in these
cases are accrued when the liability is considered
probable and the amount can reasonably be estimated.
Consistent with trends in the pharmaceutical industry,
the Company is self-insured for certain events.

The recorded liabilities for the above matters at
December 31, 1999 and 1998 and the related expenses
incurred during the three years ended December 31,
1999, were not material.  Expected insurance recoveries
have not been considered in determining the costs for
environmental-related liabilities.  Management believes
that, except for the matters discussed in the following
paragraphs, it is remote that any material liability in
excess of the amounts accrued will be incurred.

The Company is a defendant in more than 110 antitrust
actions commenced (starting in 1993) in state and
federal courts by independent retail pharmacies, chain
retail pharmacies and consumers.  The plaintiffs allege
price discrimination and/or conspiracy between the
Company and other defendants to restrain trade by
jointly refusing to sell prescription drugs at
discounted prices to the plaintiffs.

One of the federal cases is a class action on behalf of
approximately two-thirds of all retail pharmacies in
the United States and alleges a price-fixing
conspiracy.  The Company agreed to settle the federal
class action for a total of $22, which has been paid in
full.  The settlement provides, among other things,
that the Company shall not refuse to grant discounts on
brand-name prescription drugs to a retailer based
solely on its status as a retailer and that, to the
extent a retailer can demonstrate its ability to affect
market share of a Company brand-name prescription drug
in the same manner as a managed care organization with
which the retailer competes, it will be entitled to
negotiate similar incentives subject to the rights,
obligations, exemptions and defenses of the Robinson-
Patman Act and other laws and regulations.  The United
States District Court in Illinois approved the
settlement of the federal class action in June 1996.
In June 1997, the Seventh Circuit Court of Appeals
dismissed all appeals from that settlement, and it is
not subject to further review.  The defendants that did
not settle the class action proceeded to trial in
September 1998.  The trial ended in November 1998 with
a directed verdict in the defendants' favor.

In April 1997, certain of the plaintiffs in the federal
class action commenced another purported class action
in United States District Court in Illinois against the
Company and the other defendants who settled the
previous federal class action.  The complaint alleges
that the defendants conspired not to implement the
settlement commitments following the settlement
discussed above.  The District Court has denied the
plaintiffs' motion for a preliminary injunction
hearing.

The Company has settled all of the state retailer
actions, except California and Alabama.  The settlement
amounts were not material to the Company.  In addition,
in June 1999, the Alabama Supreme Court reversed the
denial of a motion for judgment on the pleadings in the
Alabama retailer case.  The court held that the Alabama
antitrust law did not apply to conspiracies alleged to
be in interstate commerce.  Based on that ruling, the
Alabama retailer case has been dismissed.

The Company has settled all of the state consumer
cases, except Alabama, North Dakota, South Dakota, West
Virginia and New Mexico.  The settlement amounts were
not material to the Company.  A motion is pending to
dismiss the Alabama consumer case based on the Alabama
Supreme Court decision in the retailer case.

In May 1998, the Company settled six of the federal
antitrust cases brought by 26 food and drug chain
retailers and several independent retail stores.
Plaintiffs in these cases comprise collectively
approximately one-fifth of the prescription drug retail
market.  Also in 1999, the Company settled federal
antitrust cases brought by independent pharmacists and
small pharmacy chains comprising about 2 percent of the
prescription drug retail market.  The settlement
amounts were not material to the Company.

Plaintiffs in these antitrust actions generally seek
treble damages in an unspecified amount and an
injunction against the allegedly unlawful conduct.

The Company believes all the antitrust actions are
without merit and is defending itself vigorously.

In March 1996, the Company was notified that the United
States Federal Trade Commission (FTC) is investigating
whether the Company, along with other pharmaceutical
companies, conspired to fix prescription drug prices.
The investigation is ongoing.  The Company believes
that its actions have been lawful and proper and is
cooperating in the investigation.  However, it is not
possible to predict the outcome of the investigation,
which could result in the imposition of fines,
penalties and injunctive or administrative remedies.

In October 1999, the Company received a subpoena from
the U.S. Attorney's Office for the Eastern District of
Pennsylvania, pursuant to the Health Insurance
Portability and Accountability Act of 1996, concerning
the Company's contracts with pharmacy benefit managers
(PBMs) and managed care organizations to provide
disease management services in connection with the
marketing of its pharmaceutical products.  It appears
that the subpoena is one of a number addressed to
industry participants including PBMs, managed care
organizations and manufacturers as a part of an inquiry
into, among other things, marketing practices. The
government's inquiry appears to focus on whether the
Company's disease management and other marketing
programs comply with federal health care laws and
whether the value of its disease management programs
should have been included in the calculation of rebates
to the government.  The Company believes that its
disease management and other marketing programs have
been designed to comply with the law and that its
rebate calculations have properly excluded the value of
its disease management programs.  The Company is
cooperating in the investigation.  However, it is not
possible to predict the outcome of the investigation,
which could include the imposition of fines, penalties
and injunctive or administrative remedies.  Nor can the
Company predict whether the investigation will affect
its marketing practices or sales.

The Company is a party to an arbitration filed by
Biogen, Inc. (Biogen) in a dispute over the method used
by the Company to determine the amount of royalties
payable to Biogen on sales of REBETRON Combination
Therapy containing REBETOL Capsules and INTRON A
Injection.  The Company believes that it should prevail
in this arbitration.  However, there can be no
assurance that the Company will prevail.

In February 1998, Geneva Pharmaceuticals, Inc. (Geneva)
submitted an Abbreviated New Drug Application (ANDA) to
the U.S. Food and Drug Administration (FDA) seeking to
market a generic form of CLARITIN in the United States
several years before the expiration of the Company's
patents.  Geneva has alleged that certain of the
Company's U.S. CLARITIN patents are invalid and
unenforceable.  The CLARITIN patents are material to
the Company's business.  In March 1998, the Company
filed suit in federal court seeking a ruling that
Geneva's ANDA submission constitutes willful
infringement of the Company's patents and that its
challenge to the Company's patents is without merit.
The Company believes that it should prevail in the
suit.  However, as with any litigation, there can be no
assurance that the Company will prevail.

During 1999, Copley Pharmaceutical, Inc., Teva
Pharmaceuticals, Inc., Novex Pharma and Zenith Goldline
Pharmaceuticals individually notified the Company that
each had submitted an ANDA to the FDA seeking to market
certain generic forms of CLARITIN in the United States
before the expiration of certain of the Company's
patents, and in 2000 Andrx Pharmaceuticals, L.L.C.
(Andrx) made a similar submission relating to CLARITIN-
D 24 Hour tablets.  Each has alleged that one or more
of those patents are invalid and unenforceable.  In
each case, except Andrx, the Company has filed suit in
federal court seeking a ruling that the applicable ANDA
submission and proposed marketing of a generic product
constitute willful infringement of the Company's patent
and that the challenge to the patent is without merit.
The Company will file a similar suit against Andrx in
federal court.  The Company believes that it should
prevail in these suits.  However, as with any
litigation, there can be no assurance that the Company
will prevail.

In January 2000, Hoffman-La Roche Inc. filed actions
against the Company in United States District Court in
New Jersey and in France alleging that the Company's
PEG-INTRON (peginterferon alfa-2b) infringes Hoffman-La
Roche Inc.'s patents on certain pegylated interferons.
The Company believes that it should prevail in these
suits.  However, as with any litigation, there can be
no assurance that the Company will prevail.


<TABLE>

QUARTERLY DATA (UNAUDITED)

<CAPTION>

Three Months Ended      March 31,        June 30,         September 30,     December 31,

                      1999    1998     1999     1998     1999      1998    1999     1998
<S>                  <C>     <C>      <C>      <C>      <C>       <C>     <C>      <C>
Net sales .  .  .  . $2,186  $1,908   $2,451   $2,124   $2,236   $1,986   $2,303   $2,059
Cost of sales.  .  .    432     380      472      423      438      394      458      404

Gross profit .  .  .  1,754   1,528    1,979    1,701    1,798    1,592    1,845    1,655

Selling, general
 and
 administrative .  .    794     712      963      828      814      762      863      839
Research and
  development   .  .    262     224      297      261      305      257      327      265
Other (income)
  expense, net  .  .    (15)     (4)      (7)       9       (7)       1      (15)      (4)

Income before
  income taxes  .  .    713     596      726      603      686      572      670      555
Income taxes    .  .    174     146      179      148      168      140      164      136

Net income.  .  .  .  $ 539   $ 450    $ 547    $ 455    $ 518    $ 432    $ 506     $419

Diluted earnings
  per common share .  $ .36   $ .30    $ .37    $ .31    $ .35    $ .29    $ .34     $.28

Basic earnings per
  common  share .  .    .37     .31      .37      .31      .35      .29      .35      .29

Dividends per
  common share  .  .    .11     .095     .125     .11      .125     .11      .125     .11

Common share prices:
  High .  .  .  .  .  58 7/8  42 3/4   60 3/4  46 11/16    56     53 17/32  56 7/8  57 1/2

  Low  .  .  .  .  .  51 1/8  30 27/32 43 5/16 39 1/16   41 9/16  43        40 3/4  45 13/16

Average shares
 outstanding for
 diluted EPS
  (in millions) .  .   1,491   1,485    1,486    1,488    1,484   1,490    1,483    1,489

Average shares
 outstanding for
 basic EPS
  (in millions) .  .   1,472   1,466    1,470    1,467    1,469   1,469    1,470    1,470

</TABLE>


The Company's common shares are listed and principally
traded on the New York Stock Exchange.  The approximate
number of holders of record of common shares as of
December 31, 1999, was 46,000.



SEGMENT INFORMATION

Schering-Plough is a worldwide research-based
pharmaceutical company engaged in the discovery,
development, manufacturing and marketing of
pharmaceutical products.  Discovery and development
efforts target the field of human health.  However,
application in the field of animal health can result
from these efforts. The Company views animal health
applications as a means to maximize the return on
investments in discovery and development.  The Company
operates primarily in the prescription pharmaceutical
marketplace.  However, the Company historically has
sought regulatory approval to switch prescription
products to over-the-counter (OTC) status as a means of
extending a product's life cycle.  In this way, the OTC
marketplace is yet another means of maximizing the
return on investments in discovery and development.
Effective January 1, 1999, the Company changed the
structure of its internal organization to reflect this
focus on pharmaceutical research and development.  As a
result, the Company reports as one segment.
Previously, the Company was organized into two business
units: pharmaceuticals and health care. Prior year
information has been restated on this basis.

<TABLE>

Net Sales by Major Therapeutic Category

<CAPTION>
                                1999      1998      1997
<S>                           <C>       <C>       <C>
Allergy & Respiratory . . . . $3,850    $3,375    $2,708
Anti-infective & Anticancer .  1,738     1,263     1,156
Dermatologicals . . . . . . .    682       619       571
Cardiovasculars . . . . . . .    673       750       637
Other Pharmaceuticals . . . .    792       688       649
Animal Health . . . . . . . .    678       647       389
Foot Care . . . . . . . . . .    348       336       300
OTC . . . . . . . . . . . . .    221       218       220
Sun Care. . . . . . . . . . .    194       181       148
Consolidated net sales. . . . $9,176    $8,077    $6,778

Consolidated income
       before income taxes. . $2,795    $2,326    $1,913

</TABLE>

The Company operates in more than 40 countries outside
the United States.  Sales outside the United States
comprised 36 percent, 37 percent and 39 percent of
consolidated net sales in 1999, 1998 and 1997,
respectively.  No single foreign country accounted for
more than 5 percent of consolidated net sales during
the past three years.

<TABLE>

Net Sales by Geographic Area

<CAPTION>
                                      1999      1998      1997
<S>                                  <C>       <C>       <C>
United States. . . . . . . . . . . . $5,835    $5,113    $4,151

Europe and Canada. . . . . . . . . .  2,157     1,889     1,620

Latin America. . . . . . . . . . . .    614       578       453

Pacific Area and Asia. . . . . . . .    570       497       554

Consolidated net sales . . . . . . . $9,176    $8,077    $6,778

</TABLE>

Net sales are presented in the geographic area in which
the Company's customers are located.  During 1999 and
1998, 12 percent and 11 percent, respectively, of
consolidated net sales were made to McKesson HBOC,
Inc., a major pharmaceutical and health care products
distributor.  During 1997, no single customer accounted
for more than 10 percent of consolidated net sales.

<TABLE>

Long-lived Assets by Geographic Location

<CAPTION>
                                       1999      1998      1997
<S>                                  <C>       <C>       <C>
United States. . . . . . . . . . . . $1,738    $1,516    $1,348

Ireland. . . . . . . . . . . . . . .    340       338       340

Singapore. . . . . . . . . . . . . .    260       268       271

Puerto Rico. . . . . . . . . . . . .    173       160       161

Other  . . . . . . . . . . . . . . .    621       598       606

Total. . . . . . . . . . . . . . . . $3,132    $2,880    $2,726

</TABLE>

Long-lived assets shown by geographic location are
primarily property.


REPORT BY MANAGEMENT

Management is responsible for the preparation and the
integrity of the accompanying financial statements.
These statements are prepared in accordance with
generally accepted accounting principles and require
the use of estimates and assumptions that affect the
reported amounts of assets, liabilities, sales and
expenses.  In management's opinion, the consolidated
financial statements present fairly the Company's
results of operations, financial position and cash
flows.  All financial information in this Annual Report
is consistent with the financial statements.

The Company maintains, and management relies on, a
system of internal accounting controls and related
policies and procedures that provide reasonable
assurance of the integrity and reliability of the
financial statements.  The system provides, at
appropriate cost and within the inherent limitations of
all internal control systems, that transactions are
executed in accordance with management's authorization,
are properly recorded and reported in the financial
statements and that assets are safeguarded.  The
Company's internal accounting control system provides
for careful selection and training of supervisory and
management personnel and requires appropriate
segregation of responsibilities and delegation of
authority.  In addition, the Company maintains a
corporate code of conduct for purposes of determining
possible conflicts of interest, compliance with laws
and confidentiality of proprietary information.

The Company's independent auditors, Deloitte & Touche
LLP, audit the annual consolidated financial
statements.  They evaluate the Company's internal
accounting controls and perform tests of procedures and
accounting records to enable them to express their
opinion on the fairness of these statements.  In
addition, the Company has an internal audit function
that regularly performs audits using programs designed
to test compliance with Company policies and
procedures, and to verify the adequacy of internal
accounting controls and other financial policies.  The
internal auditors' and independent auditors'
recommendations concerning the Company's system of
internal accounting controls have been considered and
appropriate action has been taken with respect to those
recommendations.

The Finance, Compliance and Audit Committee of the
Board of Directors consists solely of non-employee
directors.  The Committee meets periodically with
management, the internal auditors and the independent
auditors to review audit results, financial reporting,
internal accounting controls and other financial
matters.  Both the independent auditors and internal
auditors have full and free access to the Committee.

/S/ Richard Jay Kogan  /S/Jack L. Wyszomierski    /S/Thomas H. Kelly
    Chairman              Executive Vice President   Vice President
    of the Board and      and Chief Financial        and Controller
    Chief Executive       Officer
    Officer

INDEPENDENT AUDITORS' REPORT
DELOITTE & TOUCHE

Schering-Plough Corporation, its Directors and
Shareholders:

We have audited the accompanying consolidated balance
sheets of Schering-Plough Corporation and subsidiaries
as of December 31, 1999 and 1998, and the related
consolidated statements of income, shareholders' equity
and cash flows for each of the three years in the
period ended December 31, 1999.  These financial
statements are the responsibility of the Company's
management.  Our responsibility is to express an
opinion on these financial statements based on our
audits.

We conducted our audits in accordance with generally
accepted auditing standards.  Those standards require
that we plan and perform the audit to obtain reasonable
assurance about whether the financial statements are
free of material misstatement.  An audit includes
examining, on a test basis, evidence supporting the
amounts and disclosures in the financial statements.
An audit also includes assessing the accounting
principles used and significant estimates made by
management, as well as evaluating the overall financial
statement presentation.  We believe that our audits
provide a reasonable basis for our opinion.

In our opinion, such consolidated financial statements
present fairly, in all material respects, the financial
position of Schering-Plough Corporation and
subsidiaries at December 31, 1999 and 1998, and the
results of their operations and their cash flows for
each of the three years in the period ended December
31, 1999, in conformity with generally accepted
accounting principles.

/S/DELOITTE & TOUCHE LLP
Parsippany, New Jersey
February 11, 2000

<TABLE>

SCHERING-PLOUGH CORPORATION AND SUBSIDIARIES

SIX-YEAR SELECTED FINANCIAL & STATISTICAL DATA
(Dollars in millions, except per share figures)

<CAPTION>
                                   1999     1998     1997     1996     1995     1994
<S>                              <C>      <C>      <C>      <C>      <C>      <C>
Operating Results
Net Sales . . . . . . . . . . .  $9,176   $8,077   $6,778   $5,656   $5,104   $4,537
Income before income taxes. . . . 2,795    2,326    1,913    1,606    1,395    1,227
Income from continuing operations 2,110    1,756    1,444    1,213    1,053      926
Discontinued operations . . . . .     -        -        -        -     (166)      (4)
Net income. . . . . . . . . . . . 2,110    1,756    1,444    1,213      887      922
Diluted earnings per common share
  from continuing operations  . .  1.42     1.18      .97      .82      .70      .60
Diluted earnings per common share  1.42     1.18      .97      .82      .59      .60
Basic earnings per common share
  from continuing operations. . .  1.44     1.20      .98      .82      .71      .61
Discontinued operations   . . . .     -        -        -        -     (.11)    (.01)
Basic earnings per common share .  1.44     1.20      .98      .82      .60      .60
Investments
Research and development. . . . .$1,191   $1,007   $  847   $  723   $  657   $  610
Capital expenditures. . . . . . .   543      389      405      336      304      286
Financial Condition
Property, net . . . . . . . . . .$2,939   $2,675   $2,526   $2,246   $2,099   $2,082
Total assets. . . . . . . . . . . 9,375    7,840    6,507    5,398    4,665    4,326
Long-term debt. . . . . . . . . .     6        4       46       46       87      186
Shareholders' equity. . . . . . . 5,165    4,002    2,821    2,060    1,623    1,574
Net book value per common share .  3.51     2.72     1.93     1.41     1.11     1.06
Financial Statistics
Income from continuing operations
 as a percent of sales. . . . . .  23.0%    21.7%    21.3%    21.4%    20.6%    20.4%
Net income as a percent of sales.  23.0%    21.7%    21.3%    21.4%    17.4%    20.3%
Return on average shareholders'
  equity. . . . . . . . . . . . .  46.0%    51.5%    59.2%    65.9%    55.5%    58.4%
Effective tax rate. . . . . . . .  24.5%    24.5%    24.5%    24.5%    24.5%    24.5%
Other Data
Cash dividends per common share .$ .485   $ .425   $ .368   $  .32   $ .281   $ .248
Cash dividends on common shares .   716      627      542      474      416      379
Depreciation and amortization . .   264      238      200      173      157      145
Number of employees . . . . . . .26,500   25,100   22,700   20,600   20,100   20,000
Average shares outstanding
  for diluted earnings per common
  share (in millions) . . . . . . 1,486    1,488    1,480    1,487    1,498    1,547
Average shares outstanding
  for basic earnings per common
  share (in millions) . . . . . . 1,470    1,468    1,464    1,471    1,479    1,530
Common shares outstanding
  at year-end (in millions) . . . 1,472    1,472    1,465    1,461    1,457    1,488

</TABLE>



Schering-Plough Corporation and Subsidiaries
Subsidiaries of the Registrant
As of December 31, 1999

                                                                 Exhibit 21

	                                                       State or Country
	                                                       or Incorporation
Subsidiaries of Registrant                                     or Organization

AESCA Chemisch Pharmazeutische Fabrik GmbH	                  Austria
American Image Productions, Inc.                                  Tennessee
American Scientific Laboratories, Inc.                            Delaware
Ark Products Limited                                              United Kingdom
Avondale Chemical Co., Ltd.                                       Ireland
Beneficiadora e Industrializadora S.A. de C.V. 	                  Mexico
Canji, Inc.                                                       Delaware
Chemibiotic (Ireland) Limited                                     Ireland
Colombia Veterinary Holdings, Inc.                                Panama
Coopers Animal Health Limited                                     United Kingdom
Coopers Brasil Ltda.                                              Brazil
Dashtag                                                           United Kingdom
Desarrollos Farmaceuticos Y Cosmeticos S.A.                       Spain
DNAX Research Institute of Molecular & Cellular Biology, Inc.     California
Douglas Industries, Inc.                                          Delaware
Dr. Scholl's Foot Comfort Shops, Inc.                             Delaware
Essex (Taiwan) Ltd.                                               Taiwan
Essex Chemie A.G.                                                 Switzerland
Essex Farmaceutica Portuguesa, Lda                                Portugal
Essex Farmaceutica S. A.                                          Colombia
Essex Italia S.p.A.                                               Italy
Essex Pharma GmbH                                                 Germany
Essex Pharmaceuticals, Inc.                                       Philippines
Essexfarm S. A.                                                   Ecuador
Farmaceutica Essex, S. A.                                         Spain
Garden Insurance Co., Ltd.                                        Bermuda
Giralda Investments Ltd.                                          Switzerland
Global Animal Management Inc.                                     Delaware
Integrated Therapeutics Group, Inc.                               Delaware
Key Pharma                                                        Russia
Key Pharma S.A.                                                   Ecuador
Key Pharma S.A.                                                   Argentina
Key Pharma, A.G.                                                  Switzerland
Key Pharma, S.A.                                                  Spain
Key Pharmaceuticals Export Co., Inc.                         U.S. Virgin Islands
Key Pharmaceuticals, Inc.                                         Florida
Kirby Medical Products Cia Ltda                                   Chile
Kirby-Warrick Pharmaceuticals Limited                             United Kingdom
Laboratorio Essex, C.A.                                           Venezuela
Laboratorio S.P. White's, C.A.                                    Venezuela
Laboratorios Essex S.A.                                           Argentina
Loftus Bryan Chemicals Limited                                    Ireland
Macol, S.A.                                                       Colombia
Mallinckrodt Veterinary Limited	                                  Ireland
MedAdvisor, Inc.                                                  Delaware
Medexa, S.A. de C.V.                                              Mexico
Med-Nim (Proprietary) Limited                                     South Africa
P.T. Schering-Plough Indonesia                                    Indonesia
Pharmaceutical Supply Corporation                                 Delaware
Pharmaco(Canada) Inc.                                             Canada
Pharmaco, Inc.                                                    Delaware
Pitman-Moore Animal Health Limited                                New Zealand
Plough (Australia) Pty. Limited                                   Australia
Plough (UK) Limited                                               United Kingdom
Plough Benelux S.A.                                               Belgium
Plough Broadcasting Co., Inc.                                     Delaware
Plough Consumer Products (Asia) Ltd.                              Hong Kong
Plough Consumer Products (Philippines) Inc.                       Philippines
Plough de Venezuela, C.A.                                         Venezuela
Plough Export, Inc.                                               Tennessee
Plough Farma, Lda. (Portugal)                                     Portugal
Plough France S.A.                                                France
Plough Hellas Limited                                             Greece
Plough Laboratories, Inc.                                         Tennessee
Plough S.p.A.                                                     Italy
Plough Services AG                                                Switzerland
PPL, Inc.                                                         Tennessee
Pro Medica AB                                                     Sweden
Professional Pharmaceutical Corporation                           Delaware
Professional Vaccine Corporation                                  Delaware
Scheramex S.A. de C.V.                                            Mexico
Scherico, Ltd.                                                    Switzerland
Schering Canada Inc.                                              Canada
Schering Corporation                                              New Jersey
Schering Institutional Sales Corporation                          Delaware
Schering Laboratories Advertising Inc.                            Delaware
Schering MyHealth Solutions, Inc.                                 Delaware
Schering Plough (South Korea)                                     South Korea
Schering Sales Corporation                                        Delaware
Schering Sales Management, Inc.                                   Nevada
Schering Transamerica Corporation                                 New Jersey
Schering-Plough (Bray) Limited                                    Ireland
Schering-Plough (Proprietary) Limited                             South Africa
Schering-Plough A/S                                               Norway
Schering-Plough A/S                                               Denmark
Schering-Plough AB                                                Sweden
Schering-Plough Animal Health Limited                             New Zealand
Schering-Plough Animal Health Limited                             Australia
Schering-Plough Animal Health Limited                             Hong Kong
Schering-Plough Animal Health Limited                             Thailand
Schering-Plough Animal Health Operations Sdn Bhd                  Malaysia
Schering-Plough Animal Health Sales Corporation                   Delaware
Schering-Plough Animal Health Sdn Bhd                             Malaysia
Schering-Plough Animal Health, Inc.                               Philippines
Schering-Plough Animal-Health Corporation                         Delaware
Schering-Plough Animal-Health Pte. Ltd.                           Singapore
Schering-Plough B.V.                                              Netherlands
Schering-Plough C.A.                                              Venezuela
Schering-Plough Central East A.G.                                 Switzerland
Schering-Plough China, Ltd.                                       Bermuda
Schering-Plough Compania Limitada                                 Chile
Schering-Plough Coordination Center N.V./S.A.                     Belgium
Schering-Plough Corp., U.S.A.                                     Delaware
Schering-Plough Corporation                                       Philippines
Schering-Plough del Caribe, Inc.                                  New Jersey
Schering-Plough del Ecuador, S.A.                                 Ecuador
Schering-Plough del Peru S.A.                                     Peru
Schering-Plough External Affairs, Inc.                            Delaware
Schering-Plough Farma Lda.                                        Portugal
Schering-Plough Farmaceutica Ltda.                                Brazil
Schering-Plough Grenada Limited                                   Grenada
Schering-Plough HealthCare Products Advertising Corp.             Tennessee
Schering-Plough HealthCare Products Sales Corporation             California
Schering-Plough HealthCare Products, Inc.                         Delaware
Schering-Plough Holdings France                                   France
Schering-Plough Holdings Ltd.                                     United Kingdom
Schering-Plough II - Veterinaria, Lda.                            Portugal
Schering-Plough INT Limited                                       United Kingdom
Schering-Plough International Employees Inc.                      Delaware
Schering-Plough International, Inc.                               Delaware
Schering-Plough Investment Company, Inc.                          Delaware
Schering-Plough Investments Limited                               Delaware
Schering-Plough Kabushiki Kaisha                                  Japan
Schering-Plough Labo N.V.                                         Belgium
Schering-Plough Legislative Resources, L.L.C.                     Delaware
Schering-Plough Limited                                           Iran
Schering-Plough Limited                                           Taiwan
Schering-Plough Limited                                           Thailand
Schering-Plough Limited                                           United Kingdom
Schering-Plough Ltd.                                              Switzerland
Schering-Plough N.V./S.A.                                         Belgium
Schering-Plough Overseas Limited                                  Delaware
Schering-Plough OY (Finland)                                      Finland
Schering-Plough Pensions Ireland Limited                          Ireland
Schering-Plough Pharmaceutical Industrial and Commercial S.A.     Greece
Schering-Plough Products Caribe, Inc.                             Puerto Rico
Schering-Plough Products LLC                                      Puerto Rico
Schering-Plough Products, Inc.                                    Delaware
Schering-Plough Pty. Limited                                      Australia
Schering-Plough Real Estate Company, Inc.                         Delaware
Schering-Plough Real Property Holdings, Inc.                      Delaware
Schering-Plough Research Institute                                Delaware
Schering-Plough S.A.                                              France
Schering-Plough S.A.                                              Paraguay
Schering-Plough S.A.                                              Panama
Schering-Plough S.A.                                              Argentina
Schering-Plough S.A.                                              Colombia
Schering-Plough S.A.                                              Spain
Schering-Plough S.A.                                              Uruguay
Schering-Plough S.A. de C.V.                                      Mexico
Schering-Plough S.p.A.                                            Italy
Schering-Plough Sante Animale                                     France
Schering-Plough Sdn. Bhd.                                         Malaysia
Schering-Plough Tibbi Urunler Ticaret, A.S.                       Turkey
Schering-Plough Veterinaire                                       France
Schering-Plough Veterinaria, S.A. de C.V.                         Mexico
Schering-Plough Veterinary Belgium NV                             Belgium
Schering-Plough Veterinary Corporation                            Nevada
Schering-Plough Veterinary Ltd.                                   Thailand
Schering-Plough Veterinary Nederland BV                           Netherlands
Schering-Plough Veterinary Operations, Inc.                       Delaware
Schering-Plough Veterinary S.A.                                   Greece
Sentipharm A.G.                                                   Switzerland
Shanghai Schering-Plough Pharmaceutical Company, Ltd.             China
SOL Limited                                                       Bermuda
SP Biotech, S.A.                                                  Spain
SP Flight Operations, Inc.                                        Delaware
SP HealthCare Products Corp.                                      Delaware
SP Neurotech, S.A.                                                Spain
S-P RIL Limited (United Kingdom)                                  United Kingdom
S-P Veterinary (UK) Limited                                       United Kingdom
S-P Veterinary Holdings Limited                                   United Kingdom
S-P Veterinary Limited                                            United Kingdom
S-P Veterinary Pensions Limited                                   United Kingdom
Suntan Sensations, Inc.                                           California
Syntro Corporation                                                Delaware
Syntro Zeon, LC                                                   Kansas
SyntroVenture Corporation                                         Kansas
SyntroVet Incorporated                                            Kansas
Tasman Vaccine Laboratory (UK) Limited                            United Kingdom
Technobiotic  Ltd.                                                Australia
The Coppertone Corporation                                        Florida
Trading Pharma AG                                                 Switzerland
Undra S.A. de C.V.                                                Mexico
UNICET, SAS                                                       France
Warrick Pharmaceuticals Corporation                               Delaware
Warrick Pharmaceuticals Limited (United Kingdom)                  United Kingdom
Werthenstein Chemie A.G.                                          Switzerland
White Laboratories Ltd.                                           United Kingdom
White Laboratories of Canada Ltd.                                 Canada
White Laboratories, Inc.                                          New Jersey



                                                   Exhibit 23


INDEPENDENT AUDITORS' CONSENT

We consent to the incorporation by reference in Registration
Statements No. 2-83963, No. 33-19013, No. 33-50606, No. 333-30331
and No.333-87077 on Form S-8, Registration Statement No. 333-853
on Form S-3, Post Effective Amendment No. 1 to Registration
Statement No. 2-84723 on Form S-8, Post Effective Amendment No. 1
to Registration Statement No. 2-80012 on Form S-3, Post Effective
Amendment No. 1 to Registration Statement No. 2-77740 on Form S-3
and Registration Statements No. 333-12909 and No. 333-30355 on
Form S-3 of our reports dated February 11, 2000, appearing in and
incorporated by reference in the Annual Report on Form 10-K of
Schering-Plough Corporation for the year ended December 31, 1999.


/s/ DELOITTE & TOUCHE, LLP

Parsippany, New Jersey
March 2, 2000


                                                        EXHIBIT 24
POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that each of the undersigned officers and/or
directors of Schering-Plough Corporation, a New Jersey corporation
(herein called the "Corporation"), does hereby constitute and appoint William J.
Silbey, Thomas H. Kelly and Edward Smith, or any of them, his or her true
and lawful attorney or attorneys and agent or agents, to do any and all acts
and things and to execute any and all instruments which said attorney or
attorneys and agent or agents may deem necessary or advisable to enable the
Corporation to comply with the Securities Exchange Act of 1934, as
amended, and any rules, regulations, requirements or requests of the
Securities and Exchange Commission thereunder or in respect thereof in
connection with the filing under said Act of the Annual Report of the
Corporation on Form 10-K for the fiscal year ended December 31, 1999 (herein
called the "Form 10-K"); including specifically, but without limiting the
generality of the foregoing, the power and authority to sign the respective
names of the undersigned officers and/or directors as indicated below to the
Form 10-K and/or to any amendment of the Form 10-K and each of the undersigned
does hereby ratify and confirm all that said attorney or attorneys and agent or
agents, or any of them, shall do or cause to be done by virtue hereof.

IN WITNESS WHEREOF, each of the undersigned has subscribed these
presents this 22nd day of February, 2000.


/s/ Richard Jay Kogan                /s/ Jack L. Wyszomierski
Richard Jay Kogan, Chairman and      Jack L. Wyszomierski, Executive
Chief Executive Officer; Director    Vice President and Chief Financial
                                     Officer


/s/ Thomas H. Kelly                  /s/ H. Barclay Morley
Thomas H. Kelly, Vice President      H. Barclay Morley
and Controller; Principal            Director
Accounting Officer


/s/ Hans W. Becherer                 /s/ Carl E. Mundy, Jr.
Hans W. Becherer                     Carl E. Mundy, Jr.
Director                             Director


/s/ Raul E. Cesan                    /s/ Richard de J. Osborne
Raul E. Cesan                        Richard de J. Osborne
Director                             Director


/s/ Hugh A. D'Andrade                /s/ Patricia F. Russo
Hugh A. D'Andrade                    Patricia F. Russo
Director                             Director


/s/ David C. Garfield                /s/ William A. Schreyer
David C. Garfield                    William A. Schreyer
Director                             Director


/s/ Regina E. Herzlinger             /s/ Robert F. W. van Oordt
Regina E. Herzlinger                 Robert F. W. van Oordt
Director                             Director


/s/ Robert P. Luciano                /s/ Arthur F. Weinbach
Robert P. Luciano                    Arthur F. Weinbach
Director                             Director


/s/ Donald L. Miller                 /s/ James Wood
Donald L. Miller                     James Wood
Director                             Director


<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
This schedule contains financial data extracted from Schering-Plough Corporation
Consolidated Financial Statements and 10-K schedules for the year ended December
31, 1999, and is qualified in its entirety by reference to such financial
statements.
</LEGEND>
<MULTIPLIER> 1,000,000

<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                              JAN-1-1999
<PERIOD-END>                               DEC-31-1999
<CASH>                                            1876
<SECURITIES>                                         0
<RECEIVABLES>                                     1022
<ALLOWANCES>                                        92
<INVENTORY>                                        958
<CURRENT-ASSETS>                                  4909
<PP&E>                                            4386
<DEPRECIATION>                                    1447
<TOTAL-ASSETS>                                    9375
<CURRENT-LIABILITIES>                             3209
<BONDS>                                              6
                                0
                                          0
<COMMON>                                          1015
<OTHER-SE>                                        4150
<TOTAL-LIABILITY-AND-EQUITY>                      9375
<SALES>                                           9176
<TOTAL-REVENUES>                                  9176
<CGS>                                             1800
<TOTAL-COSTS>                                     1800
<OTHER-EXPENSES>                                  1191
<LOSS-PROVISION>                                    17
<INTEREST-EXPENSE>                                  29
<INCOME-PRETAX>                                   2795
<INCOME-TAX>                                       685
<INCOME-CONTINUING>                               2110
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                      2110
<EPS-BASIC>                                       1.44
<EPS-DILUTED>                                     1.42


</TABLE>


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