PAREXEL INTERNATIONAL CORP
POS AM, 1997-02-03
COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH
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<PAGE>   1

As filed with the Securities and Exchange Commission on February 3, 1997
                                                     Registration No. 333-06953
===============================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549
                                ---------------

                 POST EFFECTIVE AMENDMENT NO. 1 TO FORM S-1 ON
                                    FORM S-3
            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                                ---------------

                       PAREXEL INTERNATIONAL CORPORATION
             (Exact name of registrant as specified in its charter)

<TABLE>
<S>                                <C>                               <C>       
        MASSACHUSETTS                         8731                        04-2776269
(State or other Jurisdiction       (Primary Standard Industrial        (I.R.S. Employer
of incorporation organization)     Classification Code Number)       Identification Number)
</TABLE>

                                ---------------

                                195 WEST STREET
                          WALTHAM, MASSACHUSETTS 02154
                                 (617) 487-9900
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)

                            JOSEF H. VON RICKENBACH
                PRESIDENT, CHIEF EXECUTIVE OFFICER AND CHAIRMAN
                       PAREXEL INTERNATIONAL CORPORATION
                                195 WEST STREET
                          WALTHAM, MASSACHUSETTS 02154
                                 (617) 487-9900
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)

                                   Copies to:
                            WILLIAM J. SCHNOOR, JR.
                                HEATHER M. STONE
                         TESTA, HURWITZ & THIBEAULT, LLP
                       HIGH STREET TOWER, 125 HIGH STREET
                          BOSTON, MASSACHUSETTS 02110
                                 (617) 248-7000
        
                                 ---------------

     APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after this registration statement becomes effective.

     If the only securities being registered on this form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box. [ ]

     If any of the securities being registered on this form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. [X]
       
     If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [ ]____

     If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [ ]____

     If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [ ]

     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a),
MAY DETERMINE.



<PAGE>   2

PROSPECTUS

                                 56,818 SHARES

                       PAREXEL INTERNATIONAL CORPORATION

                                  COMMON STOCK

     This prospectus relates to the resale of up to 56,818 shares (the "Shares")
of common stock, par value $.01 per share (the "Common Stock"), of PAREXEL
International Corporation ("PAREXEL" or the "Company") which may be offered
hereby from time to time by any or all of the selling stockholders of the
Company named herein (collectively, the "Selling Stockholders"). See "Selling
Stockholders" and "Plan of Distribution."

     The Company will not receive any of the proceeds from the resale of the
Shares. The Company has agreed to bear all of the expenses in connection with
the registration and resale of the Shares (other than selling commissions and
the fees and expenses of counsel or other advisors to the Selling Stockholders).

     On May 26, 1996, the Company entered into a stock purchase agreement with
the stockholders of Sitebase Clinical Systems, Inc. ("Sitebase") pursuant to
which the Company purchased all outstanding shares of capital stock of Sitebase
with shares of Common Stock of the Company. The shares of Common Stock offered
hereby by the Selling Stockholders were acquired by such stockholders upon the
closing of the acquisition of Sitebase. In connection with the issuance of the
shares of Common Stock to the stockholders of Sitebase, each stockholder of
Sitebase agreed not to sell or otherwise transfer such shares until the
expiration of the pooling lockup period referred to herein, which expired in
August 1996. See "Selling Stockholders."

     The Common Stock of the Company is quoted on the Nasdaq National Market
under the symbol "PRXL". On January 30, 1997, the last reported sale price for
the Common Stock on the Nasdaq National Market was $58.00 per share.

   SEE "RISK FACTORS," ON PAGE 6 FOR INFORMATION THAT SHOULD BE CONSIDERED BY
                             PROSPECTIVE INVESTORS.

                                   ----------

THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

                 THE DATE OF THIS PROSPECTUS IS FEBRUARY  , 1997



<PAGE>   3

                             AVAILABLE INFORMATION

The Company is subject to the informational requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and in accordance
therewith files reports, proxy statements and other information with the
Securities and Exchange Commission (the "Commission"). Reports, proxy statements
and other information filed by the Company may be inspected and copied at the
public reference facilities maintained by the Commission at 450 Fifth Street,
N.W., Washington, D.C. 20549 and at the Commission's regional offices located at
Seven World Trade Center, New York, New York 10048, and at Northwestern Atrium
Center, 500 West Madison Street, Suite 1400, Chicago, Illinois 60661. Copies may
also be obtained from the Public Reference Section of the Commission at 450
Fifth Street, N.W., Washington, D.C. 20549 at prescribed rates. In addition, the
Commission maintains a Web site (http://www.sec.gov) that contains reports,
proxy and information statements and other information regarding registrants
that file electronically with the Commission. The Common Stock of the Company is
quoted on the Nasdaq National Market. Reports, proxy statements and other
information concerning the Company may be inspected at the offices of the
National Association of Securities Dealers, Inc. located at 1735 K Street, N.W.,
Washington, D.C. 20006.

The Company has filed with the Commission a Registration Statement on Form S-3
(including all amendments thereto, the "Registration Statement") under the
Securities Act of 1933, as amended (the "Securities Act"), with respect to the
Common Stock offered hereby. This Prospectus does not contain all information
set forth in the Registration Statement, certain parts of which are omitted in
accordance with the rules and regulations of the Commission. For further
information regarding the Company and the Common Stock offered hereby, reference
is hereby made to the Registration Statement and to the exhibits and schedules
filed therewith. Statements contained in this Prospectus regarding the contents
of any agreement or other document filed as an exhibit to the Registration
Statement are necessarily summaries of such documents, and in each instance
reference is made to the copy of such document filed as an exhibit to the
Registration Statement for a more complete description of the matters involved.
The Registration Statement, including the exhibits and schedules thereto, may be
inspected and copied at the public reference facilities maintained by the
Commission at 450 Fifth Street, N.W., Washington, D.C. 20549 or through its Web
site (http://www.sec.gov).

The Company will provide without charge to each person to whom a Prospectus is
delivered, on the written or oral request of any such person, a copy of any or
all of the documents incorporated by reference herein (other than exhibits to
such documents unless such exhibits are specifically incorporated by reference
into such documents). Requests for such copies should be directed to PAREXEL
International Corporation, Attention: Investor Relations Department, 195 West
Street, Waltham, Massachusetts, 02154, telephone number (617) 487-9900.

PAREXEL is a registered service mark of the Company.




                                       2
<PAGE>   4

               INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

The following documents filed by the Company with the Commission pursuant to the
Exchange Act are incorporated in this Prospectus by reference (File No.
0-27058):

     1.   The Company's Annual Report on Form 10-K for the fiscal year ended
          June 30, 1996.

     2.   The Company's Quarterly Report on Form 10-Q for the quarter ended
          September 30, 1996.

     3.   The Company's Current Report on Form 8-K filed on January 28, 1997.

     4.   The description of the Company's Common Stock, $.01 par value per
          share, contained in the Registration Statement on Form 8-A filed under
          the Exchange Act and declared effective on November 21, 1995,
          including any amendment or report filed for the purpose of updating
          such description.

All documents subsequently filed by the Company pursuant to Section 13(a),
13(c), 14 or 15(d) of the Exchange Act, prior to the termination of the offering
of the Shares, shall be deemed to be incorporated by reference in this
Prospectus and made a part hereof from the date of filing of such documents. Any
statement contained in a document incorporated or deemed to be incorporated by
reference in this Prospectus shall be deemed to be modified or superseded for
purposes of this Prospectus to the extent that a statement contained herein or
in any other subsequently filed document which also is or is deemed to be
incorporated by reference herein or in any Prospectus Supplement modifies or
supersedes such statement. Any such statement so modified or superseded shall
not be deemed, except as so modified or superseded, to constitute a part of this
Prospectus.



                                       3
<PAGE>   5


                                    SUMMARY

     The following summary is qualified in its entirety by the more detailed
information appearing elsewhere or incorporated by reference in this Prospectus.
This Prospectus may contain certain "forward-looking" information, as that term
is defined by (i) the Private Securities Litigation Reform Act of 1995 (the
"Act") and (ii) releases made by the Securities and Exchange Commission. Such
information involves risks and uncertainties. The Company's actual results may
differ materially from the results discussed in the forward-looking statements.
Factors that might cause such a difference include, but are not limited to,
those discussed in "Risk Factors."

                                  THE COMPANY

     PAREXEL International Corporation ("PAREXEL" or the "Company") is a leading
contract research organization ("CRO"), providing clinical research and
development services to the worldwide pharmaceutical and biotechnology
industries. The Company believes it is the fourth largest CRO, based on
estimated annual net revenue, and one of only a few CROs capable of providing a
full range of clinical services on a global basis. The Company complements the
research and development departments of pharmaceutical and biotechnology
companies by offering high quality clinical research services to the client and
reducing drug development time and cost. In addition, the Company's integrated
services and extensive information technology capabilities, coupled with its
broad experience and expertise in global drug development, provide clients with
a variable cost alternative to the fixed costs associated with internal drug
development. The Company offers a full complement of clinical research and
development services, including designing, initiating and monitoring clinical
trials, managing and analyzing clinical data and consulting on regulatory
affairs.

     PAREXEL's integrated information systems and worldwide network of offices
enable the Company to provide high-quality comprehensive services on a global
basis. The Company has provided clinical research and development services in
North America since 1985, in Europe since 1989, in Japan since May 1995 and in
Australia since December 1995.

     The CRO industry derives substantially all of its revenue from the
pharmaceutical and biotechnology industries. The Company believes that the
following trends will cause the CRO industry to continue to grow: (i) many
pharmaceutical companies, in response to margin pressures, are seeking to reduce
the high fixed costs associated with peak-load staffing for drug development by
relying on a combination of internal resources and CROs; (ii) pharmaceutical and
biotechnology companies increasingly are attempting to maximize profits from a
given drug by pursuing regulatory approvals in multiple countries in parallel,
rather than sequentially, by outsourcing to CROs with global capabilities; (iii)
as consolidation in the pharmaceutical industry continues, many pharmaceutical
companies aggressively manage costs by reducing jobs and outsourcing to
variable-cost CRO's in an effort to reduce the fixed costs associated with
internal drug development; (iv) as regulatory requirements in many jurisdictions
have become more complex, the pharmaceutical and biotechnology industries are
increasingly outsourcing to certain CROs to take advantage of their data
management expertise and global presence;


                                       4
<PAGE>   6

(v) the worldwide research and development expenditures for new drugs, including
amounts spent on services of the type provided by CROs, have experienced
substantial growth in recent years as a result of pressures to develop new drugs
for an aging population and for the treatment of life threatening diseases and
chronic disorders; and (vi) the growth of the biotechnology industry has
increased the demand for expertise and services provided by outside sources,
including CROs. There can be no assurance, however, that these trends will
result in growth in the CRO industry.

     PAREXEL's objective is to maintain and enhance its position as a leading
CRO by providing a full range of clinical services on a global basis. The
Company addresses all aspects of clinical research and development with a
flexible approach that allows its clients to use the Company's services on an
individual or bundled basis. The Company believes its expertise in conducting
scientifically demanding trials and its ability to coordinate complicated global
trials are significant competitive strengths. PAREXEL continues to devote
significant resources developing information systems designed to allow the
Company to more effectively manage its business operations and deliver services
to its clients. The Company will continue to invest in improvements in
information technology and consider acquisitions of complementary businesses in
order to enhance its competitive position and its level of service.

     Sitebase is a leading provider of remote data entry software and related
services to the pharmaceutical and biotechnology industries. Remote data entry
software facilitates the collection of clinical trials data on personal
computers at investigational sites and the ongoing transmission of such data to
trial sponsors for review and manufacturing.

     The Company was incorporated in The Commonwealth of Massachusetts in 1983.
Unless the context otherwise requires, the terms "PAREXEL" and "the Company"
refer to PAREXEL International Corporation and its subsidiaries. The Company's
principal executive offices are located at 195 West Street, Waltham,
Massachusetts 02154, and its telephone number is (617) 487-9900.

                                  THE OFFERING

     This Prospectus relates to the resale of 56,818 shares of Common Stock of
the Company received by the Selling Stockholders on the closing of the
acquisition of all outstanding shares of capital stock of Sitebase by the
Company. Such shares may be offered hereby from time to time by any or all of
the Selling Stockholders. The Company will not receive any of the proceeds from
the resale of the shares of Common Stock by the Selling Stockholders.





                                       5
<PAGE>   7


                                  RISK FACTORS

     In addition to the other information in this Prospectus, the following risk
factors should be considered carefully in evaluating the Company and its
business before purchasing the shares of Common Stock offered hereby.

LOSS OR DELAY OF LARGE CONTRACTS

     Most of the Company's contracts are terminable upon 60 to 90 days' notice
by the client. Clients terminate or delay contracts for a variety of reasons,
including, among others, the failure of products being tested to satisfy safety
requirements, unexpected or undesired clinical results of the product, the
client's decision to forego a particular study, insufficient patient enrollment
or investigator recruitment or production problems resulting in shortages of the
drug. In addition, the Company believes that several factors, including the
potential adverse impact of health care reform, have caused pharmaceutical
companies to apply more stringent criteria to the decision to proceed with
clinical trials and therefore may result in a greater willingness of these
companies to cancel contracts with CROs. The loss or delay of a large contract
or the loss or delay of multiple contracts could have a material adverse effect
on the Company.

VARIABILITY OF QUARTERLY OPERATING RESULTS

     The Company's quarterly operating results have been subject to variation,
and will continue to be subject to variation, depending upon factors such as the
initiation and progress of significant projects, exchange rate fluctuations, the
mix of services offered, the opening of new offices, the costs associated with
integrating acquisitions and the start-up costs incurred in connection with the
introduction of new products and services. In addition, during the third quarter
of fiscal 1993 and 1995, the Company's results of operations were affected by a
non-cash restructuring charge and a non-cash write-down due to the impairment of
long-lived assets, respectively. See "Risks Associated with Acquisitions."
Because a high percentage of the Company's operating costs are relatively fixed,
variations in the initiation, completion, delay or loss of contracts, or in the
progress of clinical trials can cause material adverse variations in quarterly
operating results.

DEPENDENCE ON CERTAIN INDUSTRIES AND CLIENTS

     The Company's revenues are highly dependent on research and development
expenditures by the pharmaceutical and biotechnology industries. The Company's
operations could be materially and adversely affected by general economic
downturns in its clients' industries, the impact of the current trend toward
consolidation in these industries or any decrease in research and development
expenditures. Furthermore, the Company has benefited to date from the increasing
tendency of pharmaceutical and biotechnology companies to outsource large
clinical research projects. A reversal or slowing of this trend would have a
material adverse effect on the Company.

     The Company believes that concentrations of business in the CRO industry
are not uncommon. The Company has experienced such concentration in the past and
may experience such concentration in 



                                       6
<PAGE>   8


future years. No client accounted for 10% or more of consolidated net revenue in
fiscal 1994, 1995 or 1996. In fiscal 1994, 1995 and 1996, the Company's top five
clients accounted for 29.8%, 25.2% and 32.0%, respectively, of the Company's
consolidated net revenue. The loss of business from a significant client could
have a material adverse effect on the Company.

DEPENDENCE ON GOVERNMENT REGULATION

     The Company's business depends on the comprehensive government regulation
of the drug development process. In the United States, the general trend has
been in the direction of continued or increased regulation, although the FDA
recently announced regulatory changes intended to streamline the approval
process for biotechnology products by applying the same standards as are in
effect for conventional drugs. In Europe, the general trend has been toward
coordination of common standards for clinical testing of new drugs, leading to
changes in the various requirements currently imposed by each country. Changes
in regulation, including a relaxation in regulatory requirements or the
introduction of simplified drug approval procedures, as well as anticipated
regulation, could materially and adversely affect the demand for the services
offered by the Company. In addition, failure on the part of the Company to
comply with applicable regulations could result in the termination of ongoing
research or the disqualification of data, either of which could have a material
adverse effect on the Company.

POTENTIAL ADVERSE IMPACT OF HEALTH CARE REFORM

     Numerous governments have recently undertaken efforts to control growing
health care costs through legislation, regulation and voluntary agreements with
medical care providers and pharmaceutical companies. In the last several years,
several comprehensive health care reform proposals were introduced in the U.S.
Congress. The intent of the proposals was, generally, to expand health care
coverage for the uninsured and reduce the growth of total health care
expenditures. While none of the proposals were adopted, health care reform may
again be addressed by the U.S. Congress. Implementation of government health
care reform may adversely affect research and development expenditures by
pharmaceutical and biotechnology companies, resulting in a decrease of the
business opportunities available to the Company. Management is unable to predict
the likelihood of health care reform proposals being enacted into law or the
effect such law would have on the Company.

     Many European governments have also undertaken health care reform. For
example, German health care reform legislation (the "Seehofer Gesetz"), which
was implemented on January 1, 1993, contributed to an estimated 15% decline in
German pharmaceutical industry sales in calendar 1993 and led several clients to
cancel contracts with the Company. Subsequent to these events, in the third
quarter of fiscal 1993, the Company restructured its German operations and
incurred a restructuring charge of approximately $3.3 million. In addition, in
the third quarter of fiscal 1995, the Company's results of operations were
affected by a non-cash write-down due to the impairment of long-lived assets of
PAREXEL GmbH, the Company's German subsidiary of approximately $11.3 million.
The Company cannot predict the impact that any pending or future health care
reform proposals may have on the Company's business in Europe.




                                       7
<PAGE>   9

COMPETITION; CRO INDUSTRY CONSOLIDATION

        The Company primarily competes against in-house departments of
pharmaceutical companies, full service CROs and, to a lesser extent,
universities and teaching hospitals. Some of these competitors have
substantially greater capital, technical and other resources than the Company.
CROs generally compete on the basis of previous experience, medical and
scientific expertise in specific therapeutic areas, the quality of contract
research, the ability to organize and manage large-scale trials on a global
basis, the ability to manage large and complex medical databases, the ability to
provide statistical and regulatory services, the ability to recruit
investigators, the ability to integrate information technology with systems to
improve the efficiency of contract research, an international presence with
strategically located facilities, financial viability and price. There can be no
assurance that the Company will be able to compete favorably in these areas.

     The CRO industry is highly fragmented, with participants ranging from
several hundred small, limited-service providers to several large, full-service
CROs with global operations. The trend toward CRO industry consolidation has
resulted in heightened competition among the larger CROs for clients and
acquisition candidates. In addition, consolidation within the pharmaceutical
industry as well as a trend by pharmaceutical companies of outsourcing among
fewer CROs has led to heightened competition for CRO contracts.

MANAGEMENT OF BUSINESS EXPANSION; NEED FOR IMPROVED SYSTEMS; ASSIMILATION OF
FOREIGN OPERATIONS

     The Company's business and operations have experienced substantial
expansion over the past 10 years. The Company believes that such expansion
places a strain on operational, human and financial resources. In order to
manage such expansion, the Company must continue to improve its operating,
administrative and information systems, accurately predict its future personnel
and resource needs to meet client contract commitments, track the progress of
ongoing client projects and attract and retain qualified management,
professional, scientific and technical operating personnel. Expansion of foreign
operations also may involve the additional risks of assimilating differences in
foreign business practices, hiring and retaining qualified personnel, and
overcoming language barriers. In the event that the operation of an acquired
business does not live up to expectations, the Company may be required to
restructure the acquired business or write-off the value of some or all of the
assets of the acquired business. In fiscal 1993 and 1995, the Company's results
of operations were materially and adversed affected by write-offs associated
with the Company's acquired German operations. Failure by the Company to meet
the demands of and to manage expansion of its business and operations could have
a material adverse effect on the Company's business.

RISKS ASSOCIATED WITH ACQUISITIONS

     The Company has made a number of acquisitions, including four since June 1,
1996, and will continue to review future acquisition opportunities. No
assurances can be given that acquisition candidates will continue to be
available on terms and conditions acceptable to the Company. Acquisitions
involve numerous risks, including, among other things, difficulties and expenses
incurred in connection with the acquisitions and the subsequent assimilation of
the operations and services or 



                                       8
<PAGE>   10


products of the acquired companies, the difficulty of operating new (albeit
related) businesses, the diversion of management's attention from other business
concerns and the potential loss of key employees of the acquired company.
Acquisitions of foreign companies also may involve the additional risks of
assimilating differences in foreign business practices and overcoming language
barriers. In the event that the operations of an acquired business do not live
up to expectations, the Company may be required to restructure the acquired
business or write-off the value of some or all of the assets of the acquired
business. In fiscal 1993 and 1995, the Company's results of operations were
materially and adversely affected by write-offs associated with the Company's
acquired German operations. There can be no assurance that any acquisition will
be successfully integrated into the Company's operations.

DEPENDENCE ON PERSONNEL

     The Company relies on a number of key executives, including Josef H. von
Rickenbach, its President, Chief Executive Officer and Chairman, upon whom the
Company maintains key man life insurance. Although the Company has entered into
agreements containing non-competition restrictions with its senior officers, the
Company does not have employment agreements with most of these persons and the
loss of the services of any of the Company's key executives could have a
material adverse effect on the Company. The Company's performance also depends
on its ability to attract and retain qualified professional, scientific and
technical operating staff. The level of competition among employers for skilled
personnel, particularly those with M.D., Ph.D. or equivalent degrees, is high.
There can be no assurance the Company will be able to continue to attract and
retain qualified staff. In addition, the cost of recruiting skilled personnel
has increased and there can be no assurance that such costs will not continue to
rise.

POTENTIAL LIABILITY; POSSIBLE INSUFFICIENCY OF INSURANCE

     Clinical research services involve the testing of new drugs on human
volunteers pursuant to a study protocol. Such testing involves a risk of
liability for personal injury or death to patients due to, among other reasons,
possible unforeseen adverse side effects or improper administration of the new
drug. Many of these patients are already seriously ill and are at risk of
further illness or death. The Company could be materially and adversely affected
if it were required to pay damages or incur defense costs in connection with a
claim that is outside the scope of an indemnity or insurance coverage, or if the
indemnity, although applicable, is not performed in accordance with its terms or
if the Company's liability exceeds the amount of applicable insurance. In
addition, there can be no assurance that such insurance will continue to be
available on terms acceptable to the Company.

ADVERSE EFFECT OF EXCHANGE RATE FLUCTUATIONS

     Approximately 36.0%, 40.2%, 38.4% and 33.8% of the Company's net revenue
for fiscal 1994, 1995 and 1996 and the three months ended September 30, 1996,
respectively, were derived from the Company's operations outside of North
America. Since the revenue and expenses of the Company's foreign operations are
generally denominated in local currencies, exchange rate fluctuations between
local currencies and the United States dollar will subject the Company to
currency translation risk with respect to the results of its foreign operations.
To the extent the Company is unable to shift to its clients the effects of
currency fluctuations, these fluctuations could have a material adverse effect
on the 





                                       9
<PAGE>   11


Company's results of operations. The Company does not currently hedge against
the risk of exchange rate fluctuations.

VOLATILITY OF STOCK PRICE

     The market price of the Company's Common Stock is subject to wide
fluctuations in response to quarter-to-quarter variations in operating results,
changes in earnings estimates by analysts, market conditions in the industry,
prospects of health care reform, changes in government regulation and general
economic conditions. In addition, the stock market has from time to time
experienced significant price and volume fluctuations that have been unrelated
to the operating performance of particular companies. These market fluctuations
may adversely affect the market price of the Company's Common Stock. Because the
Company's Common Stock currently trades at a relatively high price-earnings
multiple, due in part to analysts' expectations of continued earnings growth,
even a relatively small shortfall in earnings from, or a change in, analysts'
expectations may cause an immediate and substantial decline in the Company's
stock price. Investors in the Company's Common Stock must be willing to bear the
risk of such fluctuations in earnings and stock price.

ANTI-TAKEOVER PROVISIONS; POSSIBLE ISSUANCE OF PREFERRED STOCK

     The Company's Restated Articles of Organization and Restated By-Laws
contain provisions that may make it more difficult for a third party to acquire,
or may discourage a third party from acquiring, the Company. These provisions
could limit the price that certain investors might be willing to pay in the
future for shares of the Company's Common Stock. In addition, shares of the
Company's Preferred Stock may be issued in the future without further
stockholder approval and upon such terms and conditions, and having such rights,
privileges and preferences, as the Board of Directors may determine. The rights
of the holders of Common Stock will be subject to, and may be adversely affected
by, the rights of any holders of Preferred Stock that may be issued in the
future. The issuance of Preferred Stock, while providing desirable flexibility
in connection with possible acquisitions and other corporate purposes, could
adversely affect the market price of the Common Stock and could have the effect
of making it more difficult for a third party to acquire, or discouraging a
third party from acquiring, a majority of the outstanding voting stock of the
Company. The Company has no present plans to issue any shares of Preferred
Stock. See "Description of Capital Stock."




                                       10
<PAGE>   12

                                USE OF PROCEEDS

     The Company will not receive any proceeds from the resale of shares of
Common Stock by the Selling Stockholders hereunder. See "Selling Stockholders"
and "Plan of Distribution."

     The principal purpose of this offering is to effect an orderly disposition
of the Selling Stockholders' shares.

                PRICE RANGE OF COMMON STOCK AND DIVIDEND POLICY

<TABLE>
     The Company's Common Stock is quoted on the Nasdaq National Market under
the symbol "PRXL." Public trading of the Common Stock commenced on November 22,
1995. Prior to that time, there was no public market for the Company's Common
Stock. The following table sets forth the high and low sale prices for the
Common Stock as reported by Nasdaq for the periods indicated:

<CAPTION>

                                                    HIGH          LOW
                                                    ----          ---

<S>                                               <C>           <C> 
FISCAL YEAR ENDED JUNE 30, 1996:
  Second quarter  (from November 22, 1995) .....  $36           $18 3/4
  Third quarter ................................   44 1/2        26
  Fourth quarter ...............................   55 3/4        37 1/2

FISCAL YEAR ENDED JUNE 30, 1997:
  First quarter ................................  $63           $31
  Second quarter ...............................   63 3/4        45 3/4
  Third quarter (through January 30, 1997) .....   64 3/4        46 3/4

</TABLE>


     On January 30, 1997, the last reported sale price of the Common Stock on
the Nasdaq National market, was $58.00 per share. As of January 30, 1997, there
were approximately 67 stockholders of record of the Common Stock. The Company
believes that most of its stock (other than shares held by its officers and
directors) is held in street names through one or more nominees.

     In November 1995, in connection with its initial public offering, the
Company paid a cash dividend of approximately $940,000 on certain series of its
Preferred Stock, which were subsequently converted into Common Stock. The
Company has never paid or declared any dividends on its Common Stock and does
not anticipate paying any cash dividends in the foreseeable future. The Company
currently intends to retain future earnings to fund the development and growth
of its business.



                                       11
<PAGE>   13

                              SELLING STOCKHOLDERS

<TABLE>
     The Shares are to be offered by and for the respective accounts of the
Selling Stockholders. The number of Shares which each Selling Stockholder may
offer is as follows:

<CAPTION>
                                   SHARES                  SHARES OFFERED               SHARES
                                   ------                  --------------               ------
                                   OWNED                  PURSUANT TO THIS              OWNED
                                   -----                  ----------------              -----
                              BEFORE OFFERING               PROSPECTUS             AFTER OFFERING (2)
                              ---------------             ----------------         ------------------

SELLING STOCKHOLDERS        NUMBER      PERCENT (1)     NUMBER    PERCENT (1)     NUMBER     PERCENT (1)
- --------------------        ------      -----------     ------    -----------     ------     -----------

<S>                        <C>             <C>          <C>          <C>            <C>         <C>          
Raymond A. Konisky         28,409          *            28,409       *              0           *
Karen A. Konisky           28,409          *            28,409       *              0           *
                           -----------------------------------------------------------------------------
                           56,818                       56,818                      0
                           -----------------------------------------------------------------------------

- -----------
<FN>

*    Less than 1% of the outstanding Common Stock.
(1)  As of January 30, 1997, there were 9,719,484 shares of Common Stock
     outstanding.
(2)  Assuming all shares offered pursuant to this Prospectus are sold.

</TABLE>

     Raymond A. Konisky and Karen A. Konisky acquired their shares in connection
with the sale of all the outstanding stock of Sitebase Clinical Systems, Inc.
("Sitebase") to the Company pursuant to a Stock Purchase Agreement (the
"Purchase Agreement") dated May 24, 1996. Mr. Konisky and Ms. Konisky were each
officers and directors of Sitebase until they resigned such positions on the
closing of the acquisition. Mr. Konisky is currently an employee of the Company.
In the Purchase Agreement, the Company agreed to bear all expenses in connection
with the registration and sale of Mr. Konisky's and Ms. Konisky's shares (other
than underwriting discounts and selling commissions). See "Plan of
Distribution."

     Each of Mr. Konisky and Ms. Konisky represented in the Purchase Agreement,
and Registration Rights Agreement referenced therein, that he or she was
purchasing the shares from the Company without any present intention of
effecting a distribution of those shares. The acquisition is accounted for as a
pooling of interests. Mr. and Ms. Konisky each had agreed not to sell or
otherwise transfer such shares until the expiration of the pooling lockup
period, which expired in August 1996. In recognition of the fact that investors
may want to be able to sell their shares when they consider appropriate, the
Company has filed with the Commission a registration statement on Form S-3 (of
which this Prospectus is a part) with respect to the resale of the shares by the
Selling Stockholders from time to time on the Nasdaq National Market. The
Company 




                                       12
<PAGE>   14


will prepare and file such amendments and supplements to the registration
statement as may be necessary to keep it effective until the earlier of (i) the
sale of all shares pursuant to the registration statement or (ii) June 28, 1998.

     The Registration Rights Agreement entered into by the Company and the
Selling Stockholders provides that the Company will indemnify the Selling
Stockholders for any losses incurred by them in connection with actions arising
from any untrue statement of a material fact in the Registration Statement or
any omission of a material fact required to be stated therein, unless such
statement or omission was made in reliance upon written information furnished to
the Company by the Selling Stockholders. Similarly, the Registration Rights
Agreement provides that each Selling Stockholder will indemnify the Company and
its officers and directors for any losses incurred by them in connection with
any action arising from any untrue statement of material fact in the
Registration Statement or any omission of a material fact required to be stated
therein, if such statement or omission was made in reliance on written
information furnished to the Company by such Selling Stockholders.




                                       13
<PAGE>   15

                          DESCRIPTION OF CAPITAL STOCK

     The current authorized capital stock of the Company is 50,000,000 shares of
Common Stock, par value $.01 per share, and 5,000,000 shares of Preferred Stock,
par value $.01 per share.

COMMON STOCK

     As of January 30, 1997, there were 9,719, 484 shares of Common Stock
outstanding and held of record by 67 stockholders.

     Holders of Common Stock are entitled to one vote for each share held on all
matters submitted to a vote of stockholders. Holders of Common Stock do not have
cumulative voting rights. Accordingly, holders of a majority of the shares of
Common Stock entitled to vote in any election of directors may elect all of the
directors standing for election. Holders of Common Stock are entitled to receive
ratably such dividends, if any, as may be declared by the Board of Directors out
of funds legally available therefor, subject to any preferential dividend rights
of any outstanding Preferred Stock. Upon the liquidation, dissolution or winding
up of the Company, the holders of Common Stock are entitled to receive ratably
the net assets of the Company available after the payment of all debts and other
liabilities and subject to the prior rights of any outstanding Preferred Stock.
Holders of the Common Stock have no preemptive, subscription, redemption or
conversion rights. The outstanding shares of Common Stock are, and the shares
offered by the Company in this offering will be, when issued and paid for, fully
paid and nonassessable. The rights, preferences and privileges of holders of
Common Stock are subject to, and may be adversely affected by, the rights of the
holders of shares of any series of Preferred Stock which the Company may
designate and issue in the future. There are no shares of Preferred Stock
outstanding.

PREFERRED STOCK

     The Board of Directors is authorized, subject to certain limitations
prescribed by law, without further stockholder approval, to issue from time to
time up to an aggregate of 5,000,000 shares of Preferred Stock in one or more
series and to fix or alter the designations, preferences, rights and any
qualifications, limitations or restrictions of the shares of each such series
thereof, including the dividend rights, dividend rates, conversion rights,
voting rights, terms of redemption (including sinking fund provisions),
redemption price or prices, liquidation preferences and the number of shares
constituting any series or designations of such series. The issuance of
Preferred Stock may have the effect of delaying, deferring or preventing a
change of control of the Company. The Company has no present plans to issue any
shares of Preferred Stock.

MASSACHUSETTS LAW AND CERTAIN PROVISIONS OF THE COMPANY'S RESTATED ARTICLES OF
ORGANIZATION AND BY-LAWS

     The Company believes that it has more than 200 beneficial stockholders,
thus making it subject to Chapter 110F of the Massachusetts General Laws, an
anti-takeover law. In general, this statute prohibits a publicly held
Massachusetts corporation from engaging in a "business combination" with an
"interested stockholder" for a period of three years after the date of the
transaction in which the person


                                      14
<PAGE>   16


becomes an interested stockholder, unless (i) the interested stockholder obtains
the approval of the board of directors prior to becoming an interested
stockholder, (ii) the interested stockholder acquires 90% of the outstanding
voting stock of the corporation (excluding shares held by certain affiliates of
the corporation) at the time it becomes an interested stockholder, or (iii) the
business combination is approved by both the board of directors and the holders
of two-thirds of the outstanding voting stock of the corporation (excluding
shares held by the interested stockholder). An "interested stockholder" is a
person who, together with its affiliates and associates, owns (or at any time
within the prior three years did own) 5% or more of the outstanding voting stock
of the corporation. A "business combination" includes a merger, a stock or asset
sale, and certain other transactions resulting in a financial benefit to the
interested stockholder. The Company may at any time elect not to be governed by
Chapter 110F by vote of a majority of its stockholders, but such an amendment
would not be effective for twelve months and would not apply to a business
combination with any person who became an interested stockholder prior to the
adoption of the amendment.

     The Massachusetts Business Corporation Law generally requires that
publicly-held Massachusetts corporations have a classified board of directors
consisting of three classes as nearly equal in size as possible, unless those
corporations elect to opt out of the statute's coverage. By vote of the Board of
Directors, the Company has elected to opt out of the classified board provisions
of this statute and has adopted separate classified Board provisions in its
Restated Articles of Organization.

     The Company's By-Laws include a provision that excludes the Company from
the applicability of Massachusetts General Laws Chapter 110D, entitled
"Regulation of Control Share Acquisitions." In general, this statute provides
that any stockholder of a corporation subject to this statute who acquires 20%
or more of the outstanding voting stock of a corporation may not vote such stock
unless the stockholders of the corporation so authorize. The Board of Directors
may amend the Company's By-Laws at any time to subject the Company to this
statute prospectively.

     The Company's By-Laws require that nominations for the Board of Directors
made by a stockholder comply with certain notice procedures. A notice by a
stockholder of a planned nomination must be given not less than 60 and not more
than 90 days prior to a scheduled meeting, provided that if less than 70 days'
notice is given of the date of the meeting, a stockholder will have ten days
within which to give such notice. The stockholder's notice of nomination must
include particular information about the stockholder, the nominee and any
beneficial owner on whose behalf the nomination is made. The Company may require
any proposed nominee to provide such additional information as is reasonably
required to determine the eligibility of the proposed nominee.

     The By-Laws also require that a stockholder seeking to have any business
conducted at a meeting of stockholders give notice to the Company not less than
60 and not more than 90 days prior to the scheduled meeting, provided that if
less than 70 days' notice is given of the date of the meeting, a stockholder
will have ten days within which to give such notice. The notice from the
stockholder must describe the proposed business to be brought before the meeting
and include information about the stockholder making the proposal, any
beneficial owner on whose behalf the proposal is made, and any other stockholder
known to be supporting the proposal. The By-Laws require the Company to call a
special stockholders' meeting at the request of stockholders holding at least 33
1/3% of the voting power of the Company.


                                       15
<PAGE>   17
     The Company's Restated Articles of Organization include provisions
eliminating the personal liability of the Company's directors for monetary
damages resulting from breaches of their fiduciary duty to the extent permitted
by the Massachusetts Business Corporation Law. Additionally, the Company's
Restated Articles of Organization provide that the Company shall indemnify each
person who is or was a director or officer of the Company, and each person who
is or was serving or has agreed to serve at the request of the Company as a
director or officer of, or in a similar capacity with, another organization or
in any capacity with respect to any employee benefit plan of the Company,
against all liabilities, costs and expenses reasonably incurred by any such
persons in connection with the defense or disposition of or otherwise in
connection with or resulting from any action, suit or other proceeding in which
they may be involved by reason of being or having been such a director or
officer, or by reason of any action taken or not taken in such capacity, except
with respect to any matter as to which such person shall have been finally
adjudicated by a court of competent jurisdiction not to have acted in good faith
in the reasonable belief that his or her action was in the best interests of the
Company or, to the extent such matter relates to service with respect to an
employee benefit plan, in the best interests of the participants or
beneficiaries of such employee benefit plan.

     The Restated Articles of Organization provide that certain transactions,
such as the sale, lease or exchange of all or substantially all of the Company's
property and assets and the merger or consolidation of the Company into or with
any other corporation, may be authorized by the approval of the holders of a
majority of the shares of each class of stock entitled to vote thereon, rather
than by two-thirds as otherwise provided by statute, provided that the
transactions have been authorized by a majority of the members of the Board of
Directors and the requirements of any other applicable provisions of the
Restated Articles of Organization have been met.

     Certain of the provisions of the Restated Articles of Organization and
By-Laws discussed above would discourage or make more difficult a proxy contest
or the assumption of control by a holder of a substantial block of the Company's
stock. Such provisions could also have the effect of discouraging a third party
from making a tender offer or otherwise attempting to obtain control of the
Company, even though such an attempt might be beneficial to the Company and its
stockholders. In addition, since the Restated Articles of Organization and
By-Laws are designed to discourage accumulations of large blocks of the
Company's stock by purchasers whose objective is to have stock repurchased by
the Company at a premium, such provisions could tend to reduce the temporary
fluctuations in the market price of the Company's stock which are caused by such
accumulations. Accordingly, stockholders could be deprived of certain
opportunities to sell their stock at a temporarily higher market price.

TRANSFER AGENT AND REGISTRAR

     The Transfer Agent and Registrar for the Common Stock is The First National
Bank of Boston.



                                       16
<PAGE>   18

                              PLAN OF DISTRIBUTION

     The Shares offered hereby may be resold from time to time by the Selling
Stockholders for their own accounts. The Company will receive none of the
proceeds from this offering. The Selling Stockholders will pay or assume
brokerage commissions or other charges and expenses incurred in the resale of
the Shares.

     Resales of the shares by the Selling Stockholders are not subject to any
underwriting agreement. The shares covered by this Prospectus may be resold by
the Selling Stockholders or by pledgees, donees, transferees or other successors
in interest. The shares offered by each Selling Stockholder may be resold from
time to time at market prices prevailing at the time of sale, at prices relating
to such prevailing market prices or at negotiated prices. In addition, the
Selling Stockholders may resell their shares covered by this Prospectus through
customary brokerage channels, either through broker-dealers acting as agents or
brokers, or through broker-dealers acting as principals, who may then resell the
shares, or at private sales or otherwise, at market prices prevailing at the
time of sale, at prices related to such prevailing market prices or at
negotiated prices. The Selling Stockholders may effect such transactions by
selling shares to or through broker-dealers, and such broker-dealers may receive
compensation in the form of underwriting discounts, concessions, commissions, or
fees from the Selling Stockholders and/or purchasers of the shares for whom such
broker-dealers may act as agent or to whom they sell as principal, or both
(which compensation to a particular broker-dealer might be in excess of
customary commissions). Any broker-dealers that participate with the Selling
Stockholders in the distribution of the shares may be deemed to be underwriters
and any commissions received by them and any profit on the resale of the shares
positioned by them might be deemed to be underwriting discounts and commissions,
within the meaning of the Securities Act, in connection with such sales.

     The Company will inform the Selling Stockholders that the antimanipulation
rules under the Securities Exchange Act of 1934 (Rule 10b-5 and 10-6) may apply
to sales in the market and will furnish the Selling Stockholders upon request
with a copy of these Rules. The Company will also inform the Selling
Stockholders of the need for delivery of copies of this Prospectus.

     Any shares covered by the Prospectus that qualify for resale pursuant to
Rule 144 under the Securities Act may be sold under Rule 144 rather than
pursuant to this Prospectus.

     The Common Stock is quoted on the Nasdaq National Market under the symbol
"PRXL."




                                       17
<PAGE>   19


                                 LEGAL MATTERS

     The validity of the shares of Common Stock offered hereby will be passed
upon for the Company and the Selling Stockholders by Testa, Hurwitz & Thibeault,
LLP, Boston, Massachusetts.

                                    EXPERTS

     The financial statements incorporated in this Prospectus by reference to
the Annual Report on Form 10-K of PAREXEL International Corporation for the year
ended June 30, 1996, have been so incorporated in reliance on the report of
Price Waterhouse LLP, independent accountants, given on the authority of said
firm as experts in auditing and accounting.


  

                                       18
<PAGE>   20
================================================================================


No dealer, sales representative or any other person has been authorized to
give any information or to make any representations in connection with this
offering other than those contained in this prospectus, and, if given or
made, such information or representations must not be relied upon as having
been authorized by the company, any of the selling stockholders or any of the
underwriters. This prospectus does not constitute an offer to sell, or a
solicitation of an offer to buy, any securities other than the registered 
securities to which it relates or an offer to, or a solicitation of, any person
in any jurisdiction where such offer or solicitation would be unlawful.
Neither the delivery of this prospectus nor any sale made hereunder shall, 
under any circumstances, create any implication that there has been no
change in the affairs of the company since the date hereof or that the 
information contained herein is correct as of any time subsequent to the date
hereof.
    
                          _________________________


<TABLE>
                              TABLE OF CONTENTS
<CAPTION>
                                                                        PAGE
                                                                        ----

<S>                                                                      <C>
Available Information ...............................................    2
Incorporation of Certain Information by Reference ...................    3
The Company .........................................................    4
Risk Factors ........................................................    6
Use of Proceeds .....................................................    11
Price Range of Common Stock and Dividend Policy .....................    11
Selling Stockholders ................................................    12
Description of Capital Stock ........................................    14
Plan of Distribution ................................................    17
Legal Matters .......................................................    18
Experts .............................................................    18
</TABLE>


================================================================================


                                56,818 SHARES



                            PAREXEL INTERNATIONAL
                                 CORPORATION


                                 COMMON STOCK








                           _______________________

                                  PROSPECTUS


                              FEBRUARY   , 1997

                           ________________________







================================================================================

<PAGE>   21

                                   PART II
                    INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
<TABLE>

     Estimated expenses (other than underwriting discounts and commissions)
payable in connection with the sale of the Common Stock offered hereby are as
follows:

 
<S>                                                     <C>  
Registration fee......................................  $   880
Nasdaq Additional Listing fee ........................    1,616
Printing and engraving expenses ......................   15,000  
Legal fees and expenses...............................   10,000
Accounting fees and expenses..........................   10,000
Blue Sky fees and expenses (including legal fees) ....    1,500
Miscellaneous ........................................   11,004
                                                        -------
     Total............................................  $50,000
                                                        =======
<FN>

     The Company will bear all expenses shown above.


</TABLE>

ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

     Article 6 of the Company's Restated Articles of Organization provides
that the Company shall indemnify each person who is or was a director or officer
of the Company, and each person who is or was serving or has agreed to serve at
the request of the Company as a director or officer of, or in a similar capacity
with, another organization  against all liabilities,  costs and expenses
reasonably incurred by any such persons in connection with the defense or
disposition of or otherwise in connection with or resulting from any action,
suit or other proceeding in which they may be involved by reason of being or
having been such a director or officer or by reason of any action taken or not
taken in such capacity, except with respect to any matter as to which such
person shall have been finally adjudicated by a court of competent jurisdiction
not to have acted in good faith in the reasonable belief that his or her action
was in the best interests of the Company. Section 67 of Chapter 156B of the
Massachusetts Business Corporation Law authorizes a corporation to indemnify its
directors, officers, employees and other agents unless such person shall have
been adjudicated in any proceeding not to have acted in good faith in the
reasonable belief that such action was in the best interests of the corporation.

     Reference is hereby made to Section 9 of the Registration Rights
Agreement among the Company and the Selling Stockholders, filed as Exhibit 4.3
to the Registrant's Registration Statement on Form S-1 (File No. 333-06953), for
a description of indemnification arrangements between the Company and the
Selling Stockholders, pursuant to which the Selling Stockholders are obligated,
under certain circumstances, to indemnify directors, officers and controlling
persons of the Company against certain liabilities, including liabilities under
the Securities Act of 1933, as amended (the "Act").


                                     II-1
<PAGE>   22

ITEM 16.  EXHIBITS.
 
         Exhibits:

                  4.1      Specimen certificate representing the Common Stock 
                           (filed as Exhibit 4.1 to Registrant's Registration
                           Statement on Form S-1 (File No. 33-97406) and
                           incorporated herein by reference).

                  4.2*     Stock Purchase Agreement dated as of May 24, 1996 
                           between the Company, Sitebase Clinical Systems, Inc.,
                           Raymond A. Konisky and Karen A. Konisky.

                  4.3*     Registration Rights Agreement dated as of June 28,
                           1996 between the Company, Raymond A. Konisky and
                           Karen A. Konisky.

                  5.1*     Opinion of Testa, Hurwitz & Thibeault, LLP. 

                 23.1      Consent of Price Waterhouse LLP.

                 23.2*      Consent of Testa, Hurwitz & Thibeault, LLP (included
                           in Exhibit 5.1).

                 24.1*     Power of Attorney.


                -------------
                * Previously filed. 

                                      II-2
<PAGE>   23

ITEM 17. UNDERTAKINGS.

 The undersigned Registrant hereby undertakes:

(a)  (1)  To file, during any period in which offers or sales are being made, a 
          post-effective amendment to this Registration Statement:

          (i) To include any prospectus required by Section 10(a)(3) of the
          Securities Act of 1933;

          (ii) To reflect in the prospectus any facts or events arising after 
          the effective date of the registration statement (or the most recent
          post-effective amendment thereof) which, individually or in the
          aggregate, represent a fundamental change in the information set forth
          in the registration statement.

          (iii) To include any material information with respect to the plan of
          distribution not previously disclosed in the Registration Statement or
          any material change to such information in this Registration 
          Statement.

     (2)  That, for the purpose of determining any liability under the 
          Securities Act of 1933, each such post-effective amendment shall be 
          deemed to be a new registration statement relating to the securities
          offered therein, and the offering of such securities at that time 
          shall be deemed to be the initial bona fide offering thereof.

     (3)  To remove from registration by means of a post-effective amendment any
          of the securities being registered which remain unsold at the
          termination of the offering.

(b)  For the purpose of determining any liability under the Securities Act of
     1933, the information omitted from the form of prospectus filed as part of
     this registration statement in reliance upon Rule 430A and contained in a
     form of prospectus filed by the registrant pursuant to Rule 424(b)(1) or 
     (4) or 497(h) under the Securities Act shall be deemed to be part of this
     registration statement as of the time it was declared effective.

The undersigned registrant hereby undertakes that, for purposes of determining
any liability under the Securities Act of 1933, each filing of the registrant's
annual report pursuant to Section 13(a) or 15(d) of the Securities Exchange Act
of 1934 (and, where applicable, each filing of an employee benefit plan's annual
report pursuant to Section 15(d) of the Securities Exchange Act of 1934) that is
incorporated by reference in the registration statement shall be deemed to be a
new registration statement relating to the securities offered therein, and other
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

Insofar as indemnification for liabilities arising under the Securities Act of
1933 may be permitted to directors, officers and controlling persons of the
registrant pursuant to the foregoing provisions, or otherwise, the registrant
has been advised that in the opinion of the Securities and Exchange Commission
such indemnification is against public policy as expressed in the Act, and is,
therefore, unenforceable. In the event that a claim for indemnification against
such liabilities (other than the payment by the registrant of expenses incurred
or paid by a director, officer or controlling person of the registrant in the
successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Act and will be governed by the final adjudication of
such issue.


                                     II-3
<PAGE>   24


                                  SIGNATURES

     Pursuant to the requirements of the Securities Act of 1993, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the  
requirements for filing on Form S-3 and has duly caused this Post-Effective 
Amendment No. 1 on Form S-3 to this Registration Statement on Form S-1 to be 
signed on its behalf by the undersigned, thereunto duly authorized in the City
of Waltham, Commonwealth of Massachusetts on February 3, 1997.

                                     PAREXEL INTERNATIONAL CORPORATION

                                     By: /s/ William T. Sobo, Jr.
                                        ----------------------------------------
                                        William T. Sobo, Jr.
                                        Senior Vice President and Treasurer
<TABLE>
Pursuant to the requirements of the Securities Act of 1933, this Post-Effective
Amendment No. 1 to this Registration Statement has been signed below by the
following persons on behalf of the Registrant and in the capacities and on the
dates indicated.
<CAPTION>

Name                                    Capacity                                Date


<S>                                     <C>                                     <C>
           *                            President, Chief Executive Officer      February 3, 1997
- ---------------------------             and Chairman (principal executive 
Joseph H. von Rickenbach                officer)


/s/ William T. Sobo, Jr.                Senior Vice President and Treasurer     February 3, 1997
- --------------------------              (principal financial and accounting 
William T. Sobo, Jr.                    officer)

           *                            Director                                February 3, 1997
- --------------------------
A. Dana Callow, Jr.


           *                            Director                                February 3, 1997
- --------------------------
Patrick J. Fortune


           *                            Director                                February 3, 1997
- --------------------------
Werner M. Herrmann


           *                            Director                                February 3, 1997
- --------------------------  
Peter Barton Hutt


           *                            Director                                February 3, 1997
- --------------------------
James A. Saalfield


By: /s/ William T. Sobo, Jr.
   ----------------------------
   Attorney-in-fact
</TABLE>


<PAGE>   25

                                 EXHIBIT INDEX

Exhibit No.  Description of Exhibit
- -----------  -----------------------------------------------------------------

  4.1        Specimen certificate representing the Common Stock (filed as 
             Exhibit 4.1 to Registrant's Registration Statement on Form S-1 
             (File No. 33-97406) and incorporated herein by reference).

  4.2*       Stock Purchase Agreement dated as of May 24, 1996 between the 
             Company, Sitebase Clinical Systems, Inc., Raymond A. Konisky and 
             Karen A. Konisky.

  4.3*       Registration Rights Agreement dated as of June 28, 1996 between the
             Company, Raymond A. Konisky and Karen A. Konisky.

  5.1*       Opinion of Testa, Hurwitz & Thibeault, LLP. 

 23.1        Consent of Price Waterhouse LLP.

 23.2*       Consent of Testa, Hurwitz & Thibeault, LLP (included in 
             Exhibit 5.1).

 24.1*       Power of Attorney.

- ------------
* Previously filed.




<PAGE>   1


                                                                    EXHIBIT 23.1


                       CONSENT OF INDEPENDENT ACCOUNTANTS

We hereby consent to the incorporation by reference in the Prospectus
constituting part of this Registration Statement on Form S-3 of our report dated
August 22, 1996, which appears on page 33 of the 1996 Annual Report to
Shareholders of PAREXEL International Corporation, which is incorporated by
reference in PAREXEL International Corporation's Annual Report on Form 10-K for
the year ended June 30, 1996. We also consent to the application of such report
to the Financial Statement Schedule for the three years ended June 30, 1996
listed under Item 14(a) of PAREXEL International Corporation's Annual Report on
Form 10-K for the year ended June 30, 1996 when such schedule is read in
conjunction with the financial statements referred to in our report. The audit
referred to in such report also included this Financial Statement Schedule. We
also consent to the reference to us under the heading "Experts" in such
Prospectus.



PRICE WATERHOUSE LLP


BOSTON, MASSACHUSETTS
FEBRUARY 3, 1997









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