RIBOZYME PHARMACEUTICALS INC
POS EX, 1999-07-01
PHARMACEUTICAL PREPARATIONS
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<PAGE>


  AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JULY 1, 1999.
                                                     REGISTRATION NO. 333-75079
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------

                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

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

                    POST-EFFECTIVE AMENDMENT NO. 1 TO
                                   FORM S-1
                            REGISTRATION STATEMENT
                                     UNDER
                          THE SECURITIES ACT OF 1933
                               ----------------
                        RIBOZYME PHARMACEUTICALS, INC.
            (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)


        DELAWARE                     2834                    34-1697351
     (STATE OR OTHER           (PRIMARY STANDARD          (I.R.S. EMPLOYER
     JURISDICTION OF       INDUSTRIALCLASSIFICATION    IDENTIFICATION NUMBER)
    INCORPORATION OR            CODE NUMBER)
      ORGANIZATION)

                             2950 Wilderness Place
                            Boulder, Colorado 80301
                                (303) 449-6500
  (Address, including zip code, and telephone number, including area code, of
                   Registrant's principal executive offices)
                               ----------------
                            RALPH E. CHRISTOFFERSEN
                        RIBOZYME PHARMACEUTICALS, INC.
                     CHIEF EXECUTIVE OFFICER AND PRESIDENT
                             2950 WILDERNESS PLACE
                            BOULDER, COLORADO 80301
                                (303) 449-6500
(NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                             OF AGENT FOR SERVICE)
                               ----------------
                                    COPIES:
         HERBERT H. DAVIS III                    JAMES R. TANENBAUM
    ROTHGERBER JOHNSON & LYONS LLP          STROOCK & STROOCK & LAVAN LLP
     1200 17TH STREET, SUITE 3000                  180 MAIDEN LANE
        DENVER, COLORADO 80202                NEW YORK, NEW YORK 10038
            (303) 623-9000                         (212) 806-6048
                               ----------------
  APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after the Registration Statement becomes effective.
                               ----------------

  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, check the following box: [_]
  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 this Form is a post-effective amendment filed pursuant to Rule 462(d)
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 SEC, ACTING PURSUANT TO SAID
SECTION 8(A), MAY DETERMINE.

- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>

                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 13. Other Expenses Of Issuance And Distribution

  The following table sets forth the various expenses in connection with the
distribution and sale of the securities being registered which will be paid by
us. All amounts are estimates except for the SEC registration fee:

<TABLE>
   <S>                                                                 <C>
   SEC registration fee............................................... $  2,390
   Printing and mailing expenses...................................... $ 70,000
   Nasdaq listing fee................................................. $ 17,500
   Legal fees and expenses............................................ $125,000
   Accounting fees and expenses....................................... $ 40,000
                                                                       --------
       TOTAL.......................................................... $254,890
                                                                       ========
</TABLE>

Item 14. Indemnification Of Directors And Officers

  Article XI of our Bylaws provides for indemnification of our directors to the
fullest extent permitted by law, as now in effect or later amended. Article XI
of our Bylaws also permits the indemnification to the same extent of our
officers, employees or agents if, and to the extent, authorized by the Board of
Directors. In addition, the Bylaws provide for indemnification against expenses
incurred by a director to be paid by us at reasonable intervals in advance of
the final disposition of such action, suit or proceeding upon receipt of an
undertaking by or on behalf of the director or officer to repay such amount if
it shall be ultimately determined that he is not entitled to be indemnified by
us. The Bylaws further provide for a contractual cause of action on the part of
our directors for indemnification claims that have not been paid by us.

  Article VI of our Certificate of Incorporation, as amended, limits under
certain circumstances the liability of our directors for a breach of their
fiduciary duty as directors. These provisions do not eliminate the liability of
a director (1) for a breach of the director's duty of loyalty to us or our
stockholders, (2) for acts or omissions not in good faith or that involve
intentional misconduct or a knowing violation of law, (3) under Section 174 of
the General Corporate Law of the State of Delaware ("DGCL") (relating to the
declaration of dividends and purchase or redemption of shares in violation of
the DGCL) or (4) for any transaction from which the director derived an
improper personal benefit.

  Section 145 of the DGCL contains provisions regarding indemnification, among
others, of officers and directors. Section 145 of the DGCL provides in relevant
part:

    (a) A corporation shall have power to indemnify any person who was or is
  a party or is threatened to be made a party to any threatened, pending or
  completed action, suit or proceeding, whether civil, criminal,
  administrative or investigative (other than an action by or in the right of
  the corporation) by reason of the fact that the person is or was a
  director, officer, employee or agent of the corporation, or is or was
  serving at the request of the corporation as a director, officer, employee
  or agent of another corporation, partnership, joint venture, trust or other
  enterprise, against expenses (including attorneys' fees), judgments, fines
  and amounts paid in settlement actually and reasonably incurred by the
  person in connection with such action, suit or proceeding if the person
  acted in good faith and in a manner the person reasonably believed to be in
  or not opposed to the best interests of the corporation, and, with respect
  to any criminal action or proceeding, had no reasonable cause to believe
  the person's conduct was unlawful. The termination of any action, suit or
  proceeding by judgment, order, settlement, conviction, or upon a plea of
  nolo contendere or its equivalent, shall not, of itself, create a
  presumption that the person did not act in good faith and in a manner which
  the person reasonably believed to be in or not opposed to the best
  interests of the corporation, and, with respect to any criminal action or
  proceeding, had reasonable cause to believe that the person's conduct was
  unlawful.

                                      II-1
<PAGE>

    (b) A corporation shall have power to indemnify any person who was or is
  a party or is threatened to be made a party to any threatened, pending or
  completed action or suit by or in the right of the corporation to procure a
  judgment in its favor by reason of the fact that the person is or was a
  director, officer, employee or agent of the corporation, or is or was
  serving at the request of the corporation as a director, officer, employee
  or agent of another corporation, partnership, joint venture, trust or other
  enterprise against expenses (including attorneys' fees) actually and
  reasonably incurred by the person in connection with the defense or
  settlement of such action or suit if the person acted in good faith and in
  a manner the person reasonably believed to be in or not opposed to the best
  interests of the corporation and except that no indemnification shall be
  made in respect of any claim, issue or matter as to which such person shall
  have been adjudged to be liable to the corporation unless and only to the
  extent that the Court of Chancery or the court in which such action or suit
  was brought shall determine upon application that, despite the adjudication
  of liability but in view of all the circumstances of the case, such person
  is fairly and reasonably entitled to indemnity for such expenses which the
  Court of Chancery or such other court shall deem proper.

    (c) To the extent that a present or former director or officer of a
  corporation has been successful on the merits or otherwise in defense of
  any action, suit or proceeding referred to in subsections (a) and (b) of
  this section, or in defense of any claim, issue or matter therein, such
  person shall be indemnified against expenses (including attorneys' fees)
  actually and reasonably incurred by such person in connection therewith.

    (d) Any indemnification under subsections (a) and (b) of this section
  (unless ordered by a court) shall be made by the corporation only as
  authorized in the specific case upon a determination that indemnification
  of the present or former director, officer, employee or agent is proper in
  the circumstances because the person has met the applicable standard of
  conduct set forth in subsections (a) and (b) of this section. Such
  determination shall be made, with respect to a person who is a director or
  officer at the time of such determination, (1) by a majority vote of the
  directors who are not parties to such action, suit or proceeding, even
  though less than a quorum, or (2) by a committee of such directors
  designated by majority vote of such directors, even though less than a
  quorum, or (3) if there are no such directors, or if such directors so
  direct, by independent legal counsel in a written opinion, or (4) by the
  stockholders.

  Delaware law also permits a corporation to purchase and maintain insurance on
behalf of any person who is or was a director or officer against any liability
asserted against him and incurred by him in such capacity or arising out of his
status as such, whether or not the corporation has the power to indemnify him
against that liability under Section 145 of the DGCL.

  We also have provided liability insurance for each director and officer for
losses arising from claims or charges made against them while acting in their
capacities as our directors or officers.

  The above discussion of our corporate documents is not intended to be
exhaustive and is respectively qualified in its entirety by our corporate
documents.

Item 15. Recent Sale Of Unregistered Securities

  The following table sets forth the Ribozyme Pharmaceuticals' sales of
unregistered securities for the past three years. All transactions listed below
involved the issuance of common stock, preferred stock convertible into shares
of common stock or options to acquire shares of common stock prior to
commencement of the offering described in the foregoing prospectus. No
underwriters were employed with respect to the sale of any of the securities
listed below. All shares were issued in reliance upon Section 4(2) and/or 3(b)
of the Securities Act.

<TABLE>
<CAPTION>
Securities Issued                        Purchaser  Date Acquired Consideration
- -----------------                       ----------- ------------- -------------
<S>                                     <C>         <C>           <C>
212,776 shares of common stock......... Schering AG    May 1997    $2,500,000
465,117 shares of common stock......... Schering AG    May 1998    $2,500,000
5 shares of Series L preferred stock... Eli Lilly    April 1999    $7,500,000
</TABLE>


                                      II-2
<PAGE>

Item 16. Exhibits And Financial Statement Schedules

  (a) Exhibits

<TABLE>
<CAPTION>
 Number                               Description
 ------                               -----------
 <C>    <S>
  1.1+  Form of Placement Agency Agreement dated          , between Ribozyme
         Pharmaceuticals and Hambrecht & Quist LLC

  1.2   Escrow Agreement dated June 29, 1999, between Ribozyme
         Pharmaceuticals, Hambrecht & Quist LLC and Citibank, N.A.

  3.1   Amended and Restated Certificate of Incorporation of Ribozyme
         Pharmaceuticals dated April 17, 1996(5)

  3.2   Bylaws of Ribozyme Pharmaceuticals, as amended(1)

  4.1   Specimen Stock Certificate(1)

  4.2+  Certificate of Designation, Preferences and Rights of Series L
         Preferred Shares

  5.1+  Opinion of Rothgerber Johnson & Lyons LLP

 10.1   Form of Indemnity Agreement entered into between Ribozyme
         Pharmaceuticals and its directors and officers, with related
         schedule(1)

 10.2   Ribozyme Pharmaceuticals' Incentive Stock Option Plan, including form
         of Incentive Stock Option Agreement(1)

 10.3   Ribozyme Pharmaceuticals' Non-Qualified Stock Option Plan, including
         form of Non-Qualified Stock Option Agreement(1)

 10.4   Ribozyme Pharmaceuticals' 1996 Stock Option Plan, including forms of
         Incentive Stock Option and Nonstatutory Stock Option Agreements(1)

 10.5   Ribozyme Pharmaceuticals' 1996 Employee Stock Purchase Plan(1)

 10.6   Employment Agreement dated January 1, 1997, between Ribozyme
         Pharmaceuticals and Ralph E. Christoffersen(5)

 10.7   Incentive Stock Option Agreement between Ribozyme Pharmaceuticals and
         Ralph E. Christoffersen dated December 23, 1992(1)

 10.8   Incentive Stock Option Agreement between Ribozyme Pharmaceuticals and
         Ralph E. Christoffersen dated September 23, 1994(1)

 10.9   Warrant Purchase Agreement dated March 15, 1995, between Ribozyme
         Pharmaceuticals and Hambrecht & Quist Guaranty Finance(1)

 10.10  Warrant to Purchase Common Stock dated March 15, 1995, issued to
         Hambrecht & Quist Guaranty Finance(1)

 10.11  Warrant to Purchase Common Stock dated February 22, 1993, issued to
         LINC Scientific Leasing(1)

 10.12  Warrant to Purchase Common Stock dated July 30, 1993, issued to
         Douglas E. Olson(1)

 10.13  Warrant to Purchase Common Stock dated July 30, 1993, issued to
         Richard J. Warburg and Ruth P. Warburg(1)

 10.14  Warrant to Purchase Common Stock dated December 28, 1994, issued to
         Competitive Technologies, Inc.(1)

 10.15  Warrant to Purchase Common Stock dated December 29, 1995, issued to
         Silicon Valley Bank(1)

 10.16  Warrant to Purchase Common Stock dated July 26, 1996, issued to
         Silicon Valley Bank(1)

 10.17  Warrant to Purchase Common Stock dated April 17, 1996, issued to
         Chiron Corporation(1)

 10.18  Collaborative Research, Development and Commercialization Agreement
         dated July 15, 1994, between Ribozyme Pharmaceuticals and Chiron
         Corporation(1)

 10.19  Research Collaboration and Licensing Agreement dated November 1, 1995,
         between Ribozyme Pharmaceuticals and Pharmacia Biotech, AB(1)

</TABLE>


                                      II-3
<PAGE>

<TABLE>
<CAPTION>
 Number                               Description
 ------                               -----------
 <C>    <S>
 10.20  Research and Development Collaboration Agreement dated April 19, 1993,
         between Ribozyme Pharmaceuticals and Parke-Davis Division of Warner-
         Lambert Company(1)

 10.21  First Amendment to the Research and Development Collaboration
         Agreement dated April 17, 1995, between Ribozyme Pharmaceuticals and
         Parke-Davis Division of Warner-Lambert Company(1)

 10.22  Second Amendment to the Research and Development Collaboration
         Agreement dated February 8, 1996, between Ribozyme Pharmaceuticals
         and Parke-Davis Division of Warner-Lambert Company(1)

 10.23  Financing Agreement dated March 16, 1995, among Wilderness Place
         Holdings L.L.C., Hambrecht & Quist Guaranty Finance, L.P. and
         Ribozyme Pharmaceuticals(1)

 10.24  Negotiable Promissory Note dated October 7, 1992, between Ribozyme
         Pharmaceuticals and Ralph Christoffersen and Addendum dated June 25,
         1993(1)

 10.25  Employment Agreement dated January 8, 1996, between Ribozyme
         Pharmaceuticals and Lawrence E. Bullock(1)

 10.26  Promissory Note dated February 8, 1996, between Ribozyme
         Pharmaceuticals and Lawrence E. Bullock(1)

 10.27  Lease for Real Property dated May 20, 1992, between Aero-Tech
         Investments and Ribozyme Pharmaceuticals(1)

 10.28  Non-Disturbance and Attornment Agreement dated March 31, 1995, among
         General American Life Insurance Company, Aero-Tech Investments,
         Wilderness Place Holdings L.L.C. and Ribozyme Pharmaceuticals(1)

 10.29  Master Lease Agreement dated September 2, 1992, between Ribozyme
         Pharmaceuticals and LINC Scientific Leasing(1)

 10.30  Loan and Security Agreement dated February 28, 1994, between Ribozyme
         Pharmaceuticals and Silicon Valley Bank(1)

 10.31  Loan Modification Agreement dated December 21, 1994, between Ribozyme
         Pharmaceuticals and Silicon Valley Bank(1)

 10.32  Loan and Security Agreement dated December 29, 1995, between Ribozyme
         Pharmaceuticals and Silicon Valley Bank and MMC/GATX Partnership No.
         1(1)

 10.33  Warrant to Purchase Common Stock dated December 29, 1995, issued to
         MMC/GATX Partnership No. 1(1)

 10.34  Agreement dated February 29, 1996, between Ribozyme Pharmaceuticals
         and Chiron Corporation relating to research and development funding(1)

 10.35  Amendments to original Employment Agreements between Ribozyme
         Pharmaceuticals and Ralph E. Christoffersen, Lawrence E. Bullock and
         Nassim Usman, pursuant to letters dated November 14, 1996, November
         22, 1996, and December 15, 1996(3)

 10.36  Promissory Note dated June 4, 1996, between Ribozyme Pharmaceuticals
         and Nassim Usman(3)

 10.37  Amendment to Lease for Real Property dated March 13, 1997, between
         Aero-Tech Investments and Ribozyme Pharmaceuticals(3)

 10.38  Employment Agreement dated May 2, 1996, between Ribozyme
         Pharmaceuticals and Nassim Usman(2)

 10.39  Collaboration Agreement Regarding Use of Ribozymes to Determine Gene
         Function dated May 13, 1996, between Ribozyme Pharmaceuticals and
         Chiron Corporation(2)

</TABLE>


                                      II-4
<PAGE>

<TABLE>
<CAPTION>
 Number                               Description
 ------                               -----------
 <C>    <S>
 10.40  Amended and Restated License Agreement dated November 20, 1996, between
         Ribozyme Pharmaceuticals, University Research Corporation, University
         of Colorado and United States Biochemical Corporation(3)*

 10.41  Amended and Restated Sublicense Agreement dated November 20, 1996,
         between Ribozyme Pharmaceuticals and United States Biochemical
         Corporation(3)*

 10.42  Amended and Restated License Agreement dated November 20, 1996, between
         Ribozyme Pharmaceuticals and Competitive Technologies,
         Incorporated(3)*

 10.43  Memorandum of Understanding dated March 1, 1996, between Ribozyme
         Pharmaceuticals and DowElanco(1)

 10.44  Stock Subscription Agreement dated September 1996 between Ribozyme
         Pharmaceuticals and University of Research Corporation(3)*

 10.45  Stock Subscription Agreement dated November 20, 1996, between Ribozyme
         Pharmaceuticals and United States Biochemical Corporation(3)*

 10.46  Assignment of License and Restated License Agreement dated November 20,
         1996, among Ribozyme Pharmaceuticals, United States Biochemical
         Corporation and Competitive Technologies(3)*

 10.47  Letter Agreement dated May 22, 1996, between Ribozyme Pharmaceuticals
         and ALZA Corporation(3)*

 10.48  Research and Development Collaboration Agreement dated December 2,
         1996, between Ribozyme Pharmaceuticals and Protogene Laboratories(3)*

 10.49  License Agreement dated February 14, 1997, between Ribozyme
         Pharmaceuticals and IntelliGene, Ltd.(3)*

 10.50  Subscription Agreement dated April 17, 1995, between Ribozyme
         Pharmaceuticals and Parke-Davis Division of Warner-Lambert Company(1)

 10.51  Stock Purchase Agreement dated June 28, 1995, among Ribozyme
         Pharmaceuticals and investors(1)

 10.52  Agreement dated March 1, 1996, between Ribozyme Pharmaceuticals and
         DowElanco Corporation relating to the conversion of preferred stock(1)

 10.53  Stock Subscription Agreement dated October 30, 1995, between Ribozyme
         Pharmaceuticals and Gewestelijke Investeringsmaatschappij voor
         Vlaanderon n.v.(1)

 10.54  Research, License, Supply and Royalty Agreement between Schering
         Aktiengesellschaft and Ribozyme Pharmaceuticals dated April 9,
         1997(4)*

 10.55  Purchase Agreement dated April 9, 1997, among Ribozyme Pharmaceuticals,
         Schering Berlin Venture Corporation and Schering
         Aktiengesellschaft(4)*

 10.56  Employment Agreement dated February 27, 1997, between Ribozyme
         Pharmaceuticals and Alene Holzman(5)

 10.57  Employment Agreement dated July 5, 1997, between Ribozyme
         Pharmaceuticals and Thomas Rossing(5)

 10.58  Executive Bonus Plan dated March 27, 1998(6)

 10.59  Research, Collaboration and License Agreement dated May 19, 1998,
         between Ribozyme Pharmaceuticals and Roche Bioscience, a division of
         Syntex (U.S.A.) Inc.(7)*

 10.60  Employment Agreement dated September 8, 1998, between Ribozyme
         Pharmaceuticals and Nassim Usman(8)

 10.61  Participation Agreement dated August 31, 1998, as amended, and related
         documents between Ribozyme Pharmaceuticals and Atugen Biotechnology
         GmbH(9)*

</TABLE>


                                      II-5
<PAGE>

<TABLE>
<CAPTION>
 Number                              Description
 ------                              -----------
 <C>    <S>
 10.62+ Research Collaboration and License Agreement dated March 17, 1999,
         between Ribozyme Pharmaceuticals and Eli Lilly and Company*

 10.63+ Stock Purchase Agreement dated April 30, 1999, between Ribozyme
         Pharmaceuticals and Eli Lilly and Company

 10.64+ Employment Agreement dated May 10, 1999 between Ribozyme
         Pharmaceuticals and Dr. Wayne Cowens

 23.1+  Consent of Ernst & Young LLP, Independent Auditors

 23.2+  Consent of Rothgerber Johnson & Lyons LLP (included in Exhibit 5.1)

 24.1+  Power of attorney (included on the signature page of this
         Registration Statement)
</TABLE>
- --------
  + Previously filed.
  * Ribozyme Pharmaceuticals has applied for and received confidential
    treatment with respect to portions of these exhibits.

(1) Documents incorporated by reference herein to certain exhibits to Ribozyme
    Pharmaceuticals' Form SB-2 Registration Statement, File No. 333-1908-D.
(2) Documents incorporated by reference herein to certain exhibits to Ribozyme
    Pharmaceuticals' Form 10-QSB for the quarter ended June 30, 1996.
(3) Documents incorporated by reference herein to certain exhibits to Ribozyme
    Pharmaceuticals' Form 10-KSB for the year ended December 31, 1996.
(4) Documents incorporated by reference herein to certain exhibits to Ribozyme
    Pharmaceuticals' Form 8-K dated June 12, 1997.
(5) Documents incorporated by reference herein to certain exhibits to Ribozyme
    Pharmaceuticals' Form SB-2 Registration Statement, dated September 5, 1997,
    File No. 333-34981.
(6) Documents incorporated by reference herein to certain exhibits to Ribozyme
    Pharmaceuticals' Form 10-K for the year ended December 31, 1997.
(7) Documents incorporated by reference herein to certain exhibits to Ribozyme
    Pharmaceuticals' Form 10-Q/A for the quarter ended June 30, 1998.
(8) Documents incorporated by reference herein to certain exhibits to Ribozyme
    Pharmaceuticals' Form 10-Q for the quarter ended September 30, 1998.
(9) Documents incorporated by reference herein to certain exhibits to Ribozyme
    Pharmaceuticals' Form 8-K/A dated June 16, 1999.

  (b) Financial Statement Schedules

  All schedules have been omitted because they are not applicable or not
required or the required information is included in the financial statements or
notes thereto.

Item 17. Undertakings

  The undersigned registrant hereby undertakes:

    (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. Notwithstanding the foregoing, any
    increase or decrease in volume of securities offered (if the total
    dollar value of securities offered would not exceed that which was

                                      II-6
<PAGE>

    registered) and any deviation from the low or high end of the estimated
    maximum offering range may be reflected in the form of prospectus filed
    with the SEC pursuant to Rule 424(b) if, in the aggregate, the changes
    in volume and price represent no more than 20% change in the maximum
    aggregate offering price set forth in the "Calculation of Registration
    Fee" table in the effective registration statement.

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

  Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers and controlling persons of the
registrant pursuant to the provision described under Item 20 or otherwise, the
registrant has been advised that in the opinion of the SEC such indemnification
is against public policy as expressed in the Securities 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 Securities Act and will be governed
by the final adjudication of such issue.


                                      II-7
<PAGE>

                                   SIGNATURES

  Pursuant to the requirements of the Securities Act of 1933, the registrant
certifies that it has reasonable grounds to believe that it meets all the
requirements for filing on Form S-1 and has duly caused this Post-Effective
Amendment No. 1 to Form S-1 Registration Statement to be signed on its behalf
by the undersigned, thereunto duly authorized in Boulder, Colorado, on June 30,
1999.

                                          Ribozyme Pharmaceuticals, Inc.

                                              /s/ Ralph E. Christoffersen
                                          By: _________________________________
                                               Ralph E. Christoffersen, Ph.D.
                                                Chief Executive Officer and
                                                         President

  In accordance with the requirements of the Securities Act of 1933, as
amended, this Post-Effective Amendment No. 1 to Form S-1 Registration Statement
has been signed below by the following persons in the capacities and on the
dates indicated.

<TABLE>
<CAPTION>
              Signature                          Title                   Date
              ---------                          -----                   ----

<S>                                    <C>                        <C>
   /s/ Ralph E. Christoffersen         Chief Executive Officer       July 1, 1999
______________________________________  and President (Principal
    Ralph E. Christoffersen, Ph.D.      Executive Officer)

     /s/ Lawrence E. Bullock           Vice President,               July 1, 1999
______________________________________  Administration Finance,
         Lawrence E. Bullock            Chief Financial Officer
                                        and Secretary (Principal
                                        Financial and Accounting
                                        Officer)

    /s/ David T. Morgenthaler*         Chairman of the Board of      July 1, 1999
______________________________________  Directors
        David T. Morgenthaler

       /s/ Jeremy C. Cook*             Director                      July 1, 1999
______________________________________
            Jeremy C. Cook

      /s/ Anthony B. Evnin*            Director                      July 1, 1999
______________________________________
       Anthony B. Evnin, Ph.D.

       /s/ David Ichikawa*             Director                      July 1, 1999
______________________________________
            David Ichikawa

       /s/ Anders Wiklund*             Director                      July 1, 1999
______________________________________
            Anders Wiklund

     */s/ Lawrence E. Bullock
______________________________________
         Lawrence E. Bullock
           Attorney-in-fact
</TABLE>

                                      II-8
<PAGE>

                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
 Exhibit
 Number                               Description
 -------                              -----------
 <C>     <S>
   1.1+  Form of Placement Agency Agreement dated,           between Ribozyme
         Pharmaceuticals and Hambrecht & Quist LLC

   1.2   Escrow Agreement dated June 29, 1999, between Ribozyme
         Pharmaceuticals, Hambrecht & Quist LLC and Citibank N.A.

   3.1   Amended and Restated Certificate of Incorporation of Ribozyme
         Pharmaceuticals dated April 17, 1996(5)

   3.2   Bylaws of Ribozyme Pharmaceuticals, as amended(1)

   4.1   Specimen Stock Certificate(1)
   4.2+  Certificate of Designation, Preferences and Rights of Series L
         Preferred Shares

   5.1+  Opinion of Rothgerber Johnson & Lyons LLP

  10.1   Form of Indemnity Agreement entered into between Ribozyme
         Pharmaceuticals and its directors and officers, with related
         schedule(1)

  10.2   Ribozyme Pharmaceuticals' Incentive Stock Option Plan, including form
         of Incentive Stock Option Agreement(1)

  10.3   Ribozyme Pharmaceuticals' Non-Qualified Stock Option Plan, including
         form of Non-Qualified Stock Option Agreement(1)

  10.4   Ribozyme Pharmaceuticals' 1996 Stock Option Plan, including forms of
         Incentive Stock Option and Nonstatutory Stock Option Agreements(1)

  10.5   Ribozyme Pharmaceuticals' 1996 Employee Stock Purchase Plan(1)

  10.6   Employment Agreement dated January 1, 1997, between Ribozyme
         Pharmaceuticals and Ralph E. Christoffersen(5)

  10.7   Incentive Stock Option Agreement between Ribozyme Pharmaceuticals and
         Ralph E. Christoffersen dated December 23, 1992(1)

  10.8   Incentive Stock Option Agreement between Ribozyme Pharmaceuticals and
         Ralph E. Christoffersen dated September 23, 1994(1)

  10.9   Warrant Purchase Agreement dated March 15, 1995, between Ribozyme
         Pharmaceuticals and Hambrecht & Quist Guaranty Finance(1)

  10.10  Warrant to Purchase Common Stock dated March 15, 1995, issued to
         Hambrecht & Quist Guaranty Finance(1)

  10.11  Warrant to Purchase Common Stock dated February 22, 1993, issued to
         LINC Scientific Leasing(1)

  10.12  Warrant to Purchase Common Stock dated July 30, 1993, issued to
         Douglas E. Olson(1)

  10.13  Warrant to Purchase Common Stock dated July 30, 1993, issued to
         Richard J. Warburg and Ruth P. Warburg(1)

  10.14  Warrant to Purchase Common Stock dated December 28, 1994, issued to
         Competitive Technologies, Inc.(1)

  10.15  Warrant to Purchase Common Stock dated December 29, 1995, issued to
         Silicon Valley Bank(1)

  10.16  Warrant to Purchase Common Stock dated July 26, 1996, issued to
         Silicon Valley Bank(1)

  10.17  Warrant to Purchase Common Stock dated April 17, 1996, issued to
         Chiron Corporation(1)

  10.18  Collaborative Research, Development and Commercialization Agreement
         dated July 15, 1994, between Ribozyme Pharmaceuticals and Chiron
         Corporation(1)

</TABLE>

<PAGE>

<TABLE>
<CAPTION>
 Exhibit
 Number                                Description
 -------                               -----------
 <C>     <S>
  10.19  Research Collaboration and Licensing Agreement dated November 1, 1995,
         between Ribozyme Pharmaceuticals and Pharmacia Biotech, AB(1)

  10.20  Research and Development Collaboration Agreement dated April 19, 1993,
         between Ribozyme Pharmaceuticals and Parke-Davis Division of Warner-
         Lambert Company(1)

  10.21  First Amendment to the Research and Development Collaboration
         Agreement dated April 17, 1995, between Ribozyme Pharmaceuticals and
         Parke-Davis Division of Warner-Lambert Company(1)

  10.22  Second Amendment to the Research and Development Collaboration
         Agreement dated February 8, 1996, between Ribozyme Pharmaceuticals and
         Parke-Davis Division of Warner-Lambert Company(1)

  10.23  Financing Agreement dated March 16, 1995, among Wilderness Place
         Holdings L.L.C., Hambrecht & Quist Guaranty Finance, L.P. and Ribozyme
         Pharmaceuticals(1)

  10.24  Negotiable Promissory Note dated October 7, 1992, between Ribozyme
         Pharmaceuticals and Ralph Christoffersen and Addendum dated June 25,
         1993(1)

  10.25  Employment Agreement dated January 8, 1996, between Ribozyme
         Pharmaceuticals and Lawrence E. Bullock(1)

  10.26  Promissory Note dated February 8, 1996, between Ribozyme
         Pharmaceuticals and Lawrence E. Bullock(1)

  10.27  Lease for Real Property dated May 20, 1992, between Aero-Tech
         Investments and Ribozyme Pharmaceuticals(1)

  10.28  Non-Disturbance and Attornment Agreement dated March 31, 1995, among
         General American Life Insurance Company, Aero-Tech Investments,
         Wilderness Place Holdings L.L.C. and Ribozyme Pharmaceuticals(1)

  10.29  Master Lease Agreement dated September 2, 1992, between Ribozyme
         Pharmaceuticals and LINC Scientific Leasing(1)

  10.30  Loan and Security Agreement dated February 28, 1994, between Ribozyme
         Pharmaceuticals and Silicon Valley Bank(1)

  10.31  Loan Modification Agreement dated December 21, 1994, between Ribozyme
         Pharmaceuticals and Silicon Valley Bank(1)

  10.32  Loan and Security Agreement dated December 29, 1995, between Ribozyme
         Pharmaceuticals and Silicon Valley Bank and MMC/GATX Partnership No.
         1(1)

  10.33  Warrant to Purchase Common Stock dated December 29, 1995, issued to
         MMC/GATX Partnership No. 1(1)

  10.34  Agreement dated February 29, 1996, between Ribozyme Pharmaceuticals
         and Chiron Corporation relating to research and development funding(1)

  10.35  Amendments to original Employment Agreements between Ribozyme
         Pharmaceuticals and Ralph E. Christoffersen, Lawrence E. Bullock and
         Nassim Usman, pursuant to letters dated November 14, 1996, November
         22, 1996, and December 15, 1996(3)

  10.36  Promissory Note dated June 4, 1996, between Ribozyme Pharmaceuticals
         and Nassim Usman(3)

  10.37  Amendment to Lease for Real Property dated March 13, 1997, between
         Aero-Tech Investments and Ribozyme Pharmaceuticals(3)

  10.38  Employment Agreement dated May 2, 1996, between Ribozyme
         Pharmaceuticals and Nassim Usman(2)

</TABLE>
<PAGE>

<TABLE>
<CAPTION>
 Exhibit
 Number                                Description
 -------                               -----------
 <C>     <S>
  10.39  Collaboration Agreement Regarding Use of Ribozymes to Determine Gene
         Function dated May 13, 1996, between Ribozyme Pharmaceuticals and
         Chiron Corporation(2)

  10.40  Amended and Restated License Agreement dated November 20, 1996,
         between Ribozyme Pharmaceuticals, University Research Corporation,
         University of Colorado and United States Biochemical Corporation(3)*

  10.41  Amended and Restated Sublicense Agreement dated November 20, 1996,
         between Ribozyme Pharmaceuticals and United States Biochemical
         Corporation(3)*

  10.42  Amended and Restated License Agreement dated November 20, 1996,
         between Ribozyme Pharmaceuticals and Competitive Technologies,
         Incorporated(3)*

  10.43  Memorandum of Understanding dated March 1, 1996, between Ribozyme
         Pharmaceuticals and DowElanco(1)

  10.44  Stock Subscription Agreement dated September 1996 between Ribozyme
         Pharmaceuticals and University of Research Corporation(3)*

  10.45  Stock Subscription Agreement dated November 20, 1996, between Ribozyme
         Pharmaceuticals and United States Biochemical Corporation(3)*

  10.46  Assignment of License and Restated License Agreement dated November
         20, 1996, among Ribozyme Pharmaceuticals, United States Biochemical
         Corporation and Competitive Technologies(3)*

  10.47  Letter Agreement dated May 22, 1996, between Ribozyme Pharmaceuticals
         and ALZA Corporation(3)*

  10.48  Research and Development Collaboration Agreement dated December 2,
         1996, between Ribozyme Pharmaceuticals and Protogene Laboratories(3)*

  10.49  License Agreement dated February 14, 1997, between Ribozyme
         Pharmaceuticals and IntelliGene, Ltd.(3)*

  10.50  Subscription Agreement dated April 17, 1995, between Ribozyme
         Pharmaceuticals and Parke-Davis Division of Warner-Lambert Company(1)

  10.51  Stock Purchase Agreement dated June 28, 1995, among Ribozyme
         Pharmaceuticals and investors(1)

  10.52  Agreement dated March 1, 1996, between Ribozyme Pharmaceuticals and
         DowElanco Corporation relating to the conversion of preferred stock(1)

  10.53  Stock Subscription Agreement dated October 30, 1995, between Ribozyme
         Pharmaceuticals and Gewestelijke Investeringsmaatschappij voor
         Vlaanderon n.v.(1)

  10.54  Research, License, Supply and Royalty Agreement between Schering
         Aktiengesellschaft and Ribozyme Pharmaceuticals dated April 9,
         1997(4)*

  10.55  Purchase Agreement dated April 9, 1997, among Ribozyme
         Pharmaceuticals, Schering Berlin Venture Corporation and Schering
         Aktiengesellschaft(4)*

  10.56  Employment Agreement dated February 27, 1997, between Ribozyme
         Pharmaceuticals and Alene Holzman(5)

  10.57  Employment Agreement dated July 5, 1997, between Ribozyme
         Pharmaceuticals and Thomas Rossing(5)

  10.58  Executive Bonus Plan dated March 27, 1998(6)

  10.59  Research, Collaboration and License Agreement dated May 19, 1998,
         between Ribozyme Pharmaceuticals and Roche Bioscience, a division of
         Syntex (U.S.A.) Inc.(7)*

</TABLE>
<PAGE>

<TABLE>
<CAPTION>
 Exhibit
 Number                                Description
 -------                               -----------
 <C>     <S>
 10.60   Employment Agreement dated September 8, 1998, between Ribozyme
         Pharmaceuticals and Nassim Usman(7)

 10.61   Participation Agreement dated August 31, 1998, as amended, and related
         documents between Ribozyme Pharmaceuticals and Atugen Biotechnology
         GmbH(9)*

 10.62+  Research Collaboration and License Agreement dated March 17, 1999,
         between Ribozyme Pharmaceuticals and Eli Lilly and Company*

 10.63+  Stock Purchase Agreement dated April 30, 1999, between Ribozyme
         Pharmaceuticals and Eli Lilly and Company

 10.64+  Employment Agreement dated May 10, 1999 between Ribozyme
         Pharmaceuticals and Dr. Wayne Cowens

 23.1+   Consent of Ernst & Young LLP, Independent Auditors

 23.2+   Consent of Rothgerber Johnson & Lyons LLP (included in Exhibit 5.1)

 24.1+   Power of attorney (included on the signature page of this Registration
         Statement)
</TABLE>
- --------
+  Previously filed.
*  Ribozyme Pharmaceuticals has applied for and received confidential treatment
   with respect to portions of these exhibits.
(1)  Documents incorporated by reference herein to certain exhibits to Ribozyme
     Pharmaceuticals' Form SB-2 Registration Statement, File No. 333-1908-D.
(2)  Documents incorporated by reference herein to certain exhibits to Ribozyme
     Pharmaceuticals' Form 10-QSB for the quarter ended June 30, 1996.
(3)  Documents incorporated by reference herein to certain exhibits to Ribozyme
     Pharmaceuticals' Form 10-KSB for the year ended December 31, 1996.
(4)  Documents incorporated by reference herein to certain exhibits to Ribozyme
     Pharmaceuticals' Form 8-K dated June 12, 1997.
(5)  Documents incorporated by reference herein to certain exhibits to Ribozyme
     Pharmaceuticals' Form SB-2 Registration Statement, dated September 5,
     1997, File No. 333-34981.
(6)  Documents incorporated by reference herein to certain exhibits to Ribozyme
     Pharmaceuticals' Form 10-K for the year ended December 31, 1997.
(7)  Documents incorporated by reference herein to certain exhibits to Ribozyme
     Pharmaceuticals' Form 10-Q/A for the quarter ended June 30, 1998.
(8)  Documents incorporated by reference herein to certain exhibits to Ribozyme
     Pharmaceuticals' Form 10-Q for the quarter ended September 30, 1998.
(9)  Documents incorporated by reference herein to certain exhibits to Ribozyme
     Pharmaceuticals' Form 8-K/A dated June 16, 1999.

<PAGE>

                                 ESCROW AGREEMENT


          ESCROW AGREEMENT, dated as of June 29, 1999, by and among Ribozyme
Pharmaceuticals, Inc., a Delaware corporation (the "Company"), Hambrecht & Quist
LLC (the "Placement Agent") and Citibank, N.A., a national banking institution
incorporated under the laws of the United States of America (the "Escrow
Agent").

          WHEREAS, the Company proposes to sell an aggregate of 1,800,000 shares
of its common stock, par value $0.01 per share (the "Shares"), for an aggregate
of $6,300,000, all as described in the Company's registration statement on Form
S-1 (Registration No. 333-75079) (which, together with all amendments or
supplements thereto is referred to herein as the "Registration Statement");

          WHEREAS, the Shares are being offered by the Company to investors whom
the Placement Agent has introduced to the Company, pursuant to registration
under the Securities Act of 1933, as amended, and pursuant to registration or
exemptions from registration under state securities laws;

          WHEREAS, the offering of the Shares will terminate on July 6, 1999
(the "Closing Date") and, if subscriptions for the total number of Shares being
offered pursuant to the Registration Statement have not been received by the
Company on or before the Closing Date, no Shares will be sold and all payments
made by subscribers will be refunded by the Escrow Agent with interest earned
thereon, if any; and

          WHEREAS, with respect to all subscription payments received from
subscribers, the Company proposes to establish an escrow account with the Escrow
Agent at the office of its Escrow Administration, 120 Broadway, New York, New
York 10271, Attention: John P. Howard.

          NOW THEREFORE, it is agreed as follows:

          1. Establishment of Escrow. The Escrow Agent hereby agrees to receive
             -----------------------
and disburse the proceeds from the offering of the Shares and any interest
earned thereon in accordance herewith.

          2. Deposit of Escrowed Property. The Placement Agent, on behalf of
             ----------------------------
the subscribers for the Shares, shall from time to time, but in no event later
than 12:00 noon on the date following the date of receipt by the Placement
Agent, cause to be wired to or deposited with, or, cause the subscribers for the
Shares to wire or deposit with, the Escrow Agent funds or checks of the
subscribers delivered in payment for Shares (the "Escrowed Property"). Any
checks delivered to the Escrow Agent pursuant to the terms hereof shall be made
payable to the Escrow Agent. The Escrow Agent upon receipt of such checks shall
present such checks for payment to the drawee-bank under such checks. Any checks
not honored by the drawee-bank thereunder after the first presentment for
payment shall be returned to the Placement Agent, on behalf of such subscriber,
in the same manner notices are delivered pursuant to Section 6. Upon receipt of
funds or checks from

<PAGE>

the Placement Agent, the Escrow Agent shall credit such funds and the amount of
such checks to an interest-bearing account (the "Escrow Account") held by the
Escrow Agent. If following the credit of the amount of any check to the Escrow
Account such check is dishonored, the Escrow Agent, if such dishonored check
amount shall have been invested pursuant to Section 3, shall liquidate to the
extent of such dishonored check amount such investments and debit the Escrow
Account for the amount of such dishonored check plus, if any, the amount of
interest and other income earned with respect to any investment of such
dishonored check amount.

          3. Investment of Escrowed Property. The Escrow Agent on the second
              -------------------------------
business day ("business day" defined for purposes of this Escrow Agreement as
any day which is not a Saturday, a Sunday or a day on which banks or trust
companies in the City and State of New York are authorized or obligated by law,
regulation or executive order to remain closed) succeeding (unless such deposit
is made in federal or other immediately available or "same day" funds, in which
case, on the business day next succeeding) the credit of any subscription
proceeds to the Escrow Account pursuant to Section 2 and until release of such
proceeds in accordance with the terms hereof, shall deposit such proceeds in a
Citibank Market Deposit Account, pursuant to Rule 15c2-4 promulgated by the
Securities and Exchange Commission under the Securities Exchange Act of 1934, as
amended, in accordance with the terms set forth on Exhibit A hereto (made a part
of this Escrow Agreement as if herein set forth). The Escrow Agent shall in no
event be liable for any loss resulting from any change in interest rates
applicable to proceeds invested pursuant to this Section. Interest on proceeds
invested pursuant to this section shall accrue from the date of investment of
such proceeds until the termination of such investment pursuant to the terms
hereof and shall be paid as set forth in Section 5.

          4.  List of Subscribers.  The Placement Agent shall furnish or cause
              -------------------
to be furnished to the Escrow Agent, at the time of each deposit of funds or
checks pursuant to Section 2, a list, substantially in the form of Exhibit B
hereto, containing the name of, the address of, the number of Shares subscribed
for by, the subscription amount delivered to the Escrow Agent on behalf of, and
the social security or taxpayer identification number, if applicable, of each
subscriber whose funds are being deposited, and to which is attached a completed
W-9 form (or, in the case of any subscriber who is not a United States citizen
or resident, a W-8 form) for each listed subscriber. The Escrow Agent shall
notify the Placement Agent and the Company of any discrepancy between the
subscription amounts set forth on any list delivered pursuant to this Section 4
and the subscription amounts received by the Escrow Agent. The Escrow Agent is
authorized to revise such list to reflect the actual subscription amounts
received and the release of any subscription amounts pursuant to Section 5.

          5.  Withdrawal of Subscription Amounts.  (a)  If the Escrow Agent
              ----------------------------------
shall receive a notice, substantially in the form of Exhibit C hereto (an
"Offering Termination Notice"), from the Company, the Escrow Agent shall (i)
promptly after receipt of such Offering Termination Notice and the clearance of
all checks received by the Escrow Agent as Escrowed Property, but in no event
within five business days of receipt of the Offering Termination Notice,
liquidate any investments that shall have been made pursuant to Section 3 and
send to each subscriber listed on the list held by the Escrow Agent pursuant to
Section 4 whose total subscription amount shall not have been released pursuant
to paragraph (b) or (c) of this Section 5, in the manner set forth in paragraph
(e) of this Section 5, a check to the order of such subscriber in the amount of
the remaining subscription
                                      -2-
<PAGE>

amount held by the Escrow Agent as set forth on such list held by the Escrow
Agent, and (ii) promptly after the fourth business day of the month immediately
following the month in which the investments made pursuant to Section 3 were
terminated pursuant to this paragraph, send, in the manner set forth in
paragraph (e) of this Section 5, a check to the order of each such subscriber in
the amount of interest and other income earned and not yet paid with respect to
any investment of such subscriber's funds. The Escrow Agent shall notify the
Company and the Placement Agent of the distribution of such funds to the
subscribers.

                (b)  In the event that (i) the Shares have been subscribed for
and funds in respect thereof shall have been deposited with the Escrow Agent on
or before the Closing Date and (ii) no Offering Termination Notice shall have
been delivered to the Escrow Agent, the Company and the Placement Agent, shall
deliver to the Escrow Agent a joint notice, substantially in the form of Exhibit
D hereto (a "Closing Notice"), designating the date on which Shares are to be
sold and delivered to the subscribers thereof as the "Closing Date", which date
shall not be earlier than the clearance of any checks received by the Escrow
Agent as Escrowed Property, the proceeds of which are to be distributed on such
Closing Date, and identifying the subscribers and the number of Shares to be
sold to each thereof on such Closing Date. Such Closing Notice, unless the
parties otherwise agree, shall be delivered not less than two (2) nor more than
five (5) business days prior to such Closing Date. The Escrow Agent, after
receipt of such Closing Notice and the clearance of such checks:

                (i)  on or prior to the Closing Date identified in such Closing
        Notice, shall liquidate any investments that shall have been made
        pursuant to Section 3 to the extent of the subscription amount to be
        distributed pursuant to the immediately succeeding clause (ii);

                (ii)  on such Closing Date, pay to the Company and the
        Placement Agent, in federal or other immediately available funds and
        otherwise in the manner and amount specified by the Company and the
        Placement Agent in such Closing Notice, an amount equal to the aggregate
        of the subscription amounts paid by the subscribers identified in such
        Closing Notice for the Shares to be sold on such Closing Date as set
        forth on the list held by the Escrow Agent pursuant to Section 4; and

                (iii)  promptly after the fourth business day of the month
        immediately following the month in which the investments made pursuant
        to Section 3 were terminated pursuant to such Closing Notice, shall
        send, in the manner set forth in paragraph (e) of this Section 5, a
        check to the order of each subscriber identified in such Closing Notice
        in the amount of interest and other income earned and not yet paid with
        respect to any investment of each such subscriber's funds distributed on
        such Closing Date. At the time of such transfer, the Escrow Agent shall
        identify in writing to the Company and the Placement Agent the amount of
        the interest earned for the account of each subscriber and the date such
        subscription was received.

                (c)  If at any time and from time to time prior to the release
of any subscriber's total subscription amount pursuant to paragraph (a) or (b)
of this Section 5 from escrow, the Company shall deliver to the Escrow Agent a
notice, substantially in the form of Exhibit E hereto (a "Subscription
Termination Notice"), to the effect that any or all of the subscriptions of

                                      -3-
<PAGE>

such subscriber have been rejected by the Company (a "Rejected Subscription"),
the Escrow Agent (i) promptly after receipt of such Subscription Termination
Notice and, if such subscriber delivered a check in payment of its Rejected
Subscription, after the clearance of such check, shall liquidate, to the extent
of the sum of such subscriber's Rejected Subscription amount as set forth in the
Subscription Termination Notice, any investments that shall have been made
pursuant to Section 3 and send to such subscriber, in the manner set forth in
paragraph (e) of this Section 5, a check to the order of such subscriber in the
amount of such Rejected Subscription amount, and (ii) promptly after the fourth
business day of the month immediately following the month in which the
investments made pursuant to Section 3 were terminated pursuant to this
paragraph, shall send to such subscriber, in the manner set forth in paragraph
(e) of this Section 5, a check to the order of such subscriber in the amount of
interest and other income earned and not yet paid with respect to any investment
of such subscriber's Rejected Subscription amount. At the time of such transfer,
the Escrow Agent shall identify in writing to the Company and the Placement
Agent the amount of the interest earned for the account of each subscriber and
the date such subscription was received.

                (d)  On a date following the transfer of any interest earned
for the account of each subscriber pursuant to Section 5(a), (b) or (c), but not
later than January 31, 2000, the Escrow Agent shall provide each subscriber with
tax form 1099 setting forth the amount of such interest.

                (e)  For the purposes of this Section 5, any check that the
Escrow Agent shall be required to send to any subscriber shall be sent to such
subscriber by first class mail, postage prepaid, at such subscriber's address
furnished to the Escrow Agent pursuant to Section 4.

        6.      Notices.  Any notice or other communication required or
                -------
permitted to be given hereunder shall be in writing and shall be (a) delivered
by hand or (b) sent by mail, registered or certified, with proper postage
prepaid or (c) sent by facsimile, with confirmation , and addressed as follows:

        if to the Company, to:

                Ribozyme Pharmaceuticals, Inc.
                2950 Wilderness Place
                Boulder, Colorado  80301
                Attention:  Larry E. Bullock
                Facsimile: (303) 449-6995

        with a copy to:

                Rothgerber Johnson & Lyons LLP
                One Tabor Center
                1200 17th Street, Suite 3000
                Denver, Colorado  80202-5839
                Attention:  Herbert Davis III
                Facsimile: (303) 623-9560

                                      -4-
<PAGE>

        if to the Placement Agent, to:

                Hambrecht & Quist LLC
                One Bush Street
                San Francisco, California  94104
                Attention:  Shelly D. Guyer
                Facsimile: (415) 439-3479

        with a copy to:

                Stroock & Stroock & Lavan LLP
                180 Maiden Lane
                New York, New York  10038-4982
                Attention:  Anna T. Pinedo, Esq.
                Facsimile: (212) 806-6006

        if to the Escrow Agent, to:

                Citibank, N.A.
                The Citibank Private Bank
                120 Broadway, 2nd Floor
                New York, New York 10271
                Attention: John P. Howard
                Facsimile: (212) 266-4550


or to such other address as the person to whom notice is to be given may have
previously furnished to the others in the above-referenced manner.  All such
notices and communications, if mailed, shall be effective when deposited in the
mails, except that notices and communications to the Escrow Agent and notices of
changes of address shall not be effective until received.

        7.      Concerning the Escrow Agent.  To induce the Escrow Agent to act
                ---------------------------
hereunder, it is further agreed by the Company and Placement Agent that:

                (a)  The Escrow Agent shall not be under any duty to give the
Escrowed Property held by it hereunder any greater degree of care than it gives
its own similar property and shall not be required to invest any funds held
hereunder except as directed in this Escrow Agreement. Uninvested funds held
hereunder shall not earn or accrue interest.

                (b)  This Escrow Agreement expressly sets forth all the duties
of the Escrow Agent with respect to any and all matters pertinent hereto. No
implied duties or obligations shall be read into this Escrow Agreement against
the Escrow Agent. The Escrow Agent shall not be bound by the provisions of any
agreement among the other parties hereto except this Escrow Agreement.

                                      -5-
<PAGE>

                (c)  The Escrow Agent shall not be liable, except for its own
gross negligence or willful misconduct, and, except with respect to claims based
upon such gross negligence or willful misconduct that are successfully asserted
against the Escrow Agent, and the other parties hereto shall jointly and
severally indemnify and hold harmless the Escrow Agent (and any successor Escrow
Agent) from and against any and all losses, liabilities, claims, actions,
damages and expenses, including reasonable attorneys' fees and disbursements,
arising out of and in connection with this Escrow Agreement. Without limiting
the foregoing, the Escrow Agent shall in no event be liable in connection with
its investment or reinvestment of any cash held by it hereunder in good faith,
in accordance with the terms hereof, including without limitation any liability
for any delays (not resulting from gross negligence or willful misconduct) in
the investment or reinvestment of the Escrowed Property, or any loss of interest
incident to any such delays.

                (d)  The Escrow Agent shall be entitled to rely upon any order,
judgment, certification, demand, notice, instrument or other writing delivered
to it hereunder without being required to determine the authenticity or the
correctness of any fact stated therein or the propriety or validity of the
service thereof. The Escrow Agent may act in reliance upon any instrument or
signature believed by it in good faith to be genuine and may assume, if in good
faith, that any person purporting to give notice or receipt or advice or make
any statement or execute any document in connection with the provisions hereof
has been duly authorized to do so.

                (e)  The Escrow Agent may act pursuant to the advice of counsel
with respect to any matter relating to this Escrow Agreement and shall not be
liable for any action taken or omitted in good faith and in accordance with such
advice.

                (f)  The Escrow Agent does not have any interest in the Escrowed
Property deposited hereunder but is serving as escrow holder only. Any payments
of income from the Escrow Account shall be subject to withholding regulations
then in force with respect to United States taxes. The parties hereto will
provide the Escrow Agent with appropriate W-9 forms for tax I.D., number
certification, or non-resident alien certifications.

        This paragraph (f) and paragraph (c) of this Section 7 shall survive
notwithstanding any termination of this Escrow Agreement or the resignation of
the Escrow Agent.

                (g)  The Escrow Agent makes no representation as to the
validity, value, genuineness or the collectibility of any security or other
document or instrument held by or delivered to it.

                (h)  The Escrow Agent shall not be called upon to advise any
party as to the wisdom of selling or retaining or taking or refraining from any
action with respect to any securities or other property deposited hereunder.

                (i)  The Escrow Agent (and any successor escrow agent) at any
time may be discharged from its duties and obligations hereunder by the delivery
to it of notice of termination signed by both the Company and the Placement
Agent or at any time may resign by giving written notice to such effect to the
Company and the Placement Agent. Upon any such termination or resignation, the
Escrow Agent shall deliver the Escrowed Property to any successor escrow agent

                                      -6-
<PAGE>

jointly designated by the other parties hereto in writing, or to any court of
competent jurisdiction if no such successor escrow agent is agreed upon,
whereupon the Escrow Agent shall be discharged of and from any and all further
obligations arising in connection with this Escrow Agreement. The termination or
resignation of the Escrow Agent shall take effect on the earlier of (i) the
appointment of a successor (including a court of competent jurisdiction) or (ii)
the day that is 30 days after the date of delivery: (A) to the Escrow Agent of
the other parties' notice of termination or (B) to the other parties hereto of
the Escrow Agent's written notice of resignation. If at that time the Escrow
Agent has not received a designation of a successor escrow agent, the Escrow
Agent's sole responsibility after that time shall be to keep the Escrowed
Property safe until receipt of a designation of successor escrow agent or a
joint written disposition instruction by the other parties hereto or any
enforceable order of a court of competent jurisdiction.

          (j)  The Escrow Agent shall have no responsibility for the contents of
any writing of any third party contemplated herein as a means to resolve
disputes and may rely without any liability upon the contents thereof.

          (k)  In the event of any disagreement among or between the other
parties hereto and/or the subscribers of the Shares resulting in adverse claims
or demands being made in connection with the Escrowed Property, or in the event
that the Escrow Agent in good faith is in doubt as to what action it should take
hereunder, the Escrow Agent shall be entitled to retain the Escrowed Property
until the Escrow Agent shall have received (i) a final and non-appealable order
of a court of competent jurisdiction directing delivery of the Escrowed Property
or (ii) a written agreement executed by the other parties hereto and consented
to by the subscribers directing delivery of the Escrowed Property, in which
event the Escrow Agent shall disburse the Escrowed Property in accordance with
such order or agreement. Any court order referred to in (i) above shall be
accompanied by a legal opinion by counsel for the presenting party satisfactory
to the Escrow Agent to the effect that said court order is final and non-
appealable. The Escrow Agent shall act on such court order and legal opinion
without further question.

          (l)  As consideration for its agreement to act as Escrow Agent as
herein described, the Company agrees to pay the Escrow Agent fees determined in
accordance with the terms set forth on Exhibit F hereto (made a part of this
Escrow Agreement as if herein set forth). In addition, the Company agrees to
reimburse the Escrow Agent for all reasonable expenses, disbursements and
advances incurred or made by the Escrow Agent in performance of its duties
hereunder (including reasonable fees, expenses and disbursements of its
counsel).

          (m)  The other parties hereto irrevocably (i) submit to the
jurisdiction of any New York State or federal court sitting in New York City in
any action or proceeding arising out of or relating to this Escrow Agreement,
(ii) agree that all claims with respect to such action or proceeding shall be
heard and determined in such New York State or federal court and (iii) waive, to
the fullest extent possible, the defense of an inconvenient forum. The other
parties hereby consent to and grant any such court jurisdiction over the persons
of such parties and over the subject matter of any such dispute and agree that
delivery or mailing of process or other papers in connection with any such
action or proceeding in the manner provided hereinabove, or in such other manner
as may be permitted by law, shall be valid and sufficient service thereof.

                                      -7-
<PAGE>

          (n)  No printed or other matter in any language (including, without
limitation, the Registration Statement, notices, reports and promotional
material) which mentions the Escrow Agent's name or the rights, powers, or
duties of the Escrow Agent shall be issued by the other parties hereto or on
such parties' behalf unless the Escrow Agent shall first have given its specific
written consent thereto. The Escrow Agent hereby consents to the use of its name
and the reference to the escrow arrangement in the Registration Statement.

 8.  Miscellaneous.
     -------------

          (a)  This Escrow Agreement shall be binding upon and inure solely to
the benefit of the parties hereto and their respective successors and assigns,
heirs, administrators and representatives, and the subscribers of the Shares and
shall not be enforceable by or inure to the benefit of any other third party
except as provided in paragraph (i) of Section 7 with respect to the termination
of, or resignation by, the Escrow Agent. No party may assign any of its rights
or obligations under this Escrow Agreement without the written consent of the
other parties.

          (b)  This Escrow Agreement shall be construed in accordance with and
governed by the internal law of the State of New York (without reference to its
rules as to conflicts of law).

          (c)  This Escrow Agreement may only be modified by a writing signed by
all of the parties hereto and consented to by the subscribers of the Shares
adversely affected by such modifications. No waiver hereunder shall be effective
unless in a writing signed by the party to be charged.

          (d)  This Escrow Agreement shall terminate upon the payment pursuant
to Section 5 of all amounts held in the Escrow Account.

          (e)  The section headings herein are for convenience only and shall
not affect the construction thereof. Unless otherwise indicated, references to
Sections are to Sections contained herein.

          (f)  This Escrow Agreement may be executed in one or more counterparts
but all such separate counterparts shall constitute but one and the same
instrument; provided that, although executed in counterparts, the executed
signature pages of each such counterpart may be affixed to a single copy of this
Agreement which shall constitute an original.

                                      -8-
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Escrow Agreement to
be executed as of the day and year first above written.


                                          RIBOZYME PHARMACEUTICALS, INC.


                                          By:
                                             -----------------------------------
                                             Name:
                                             Title:


                                          HAMBRECHT & QUIST LLC


                                          By:
                                             -----------------------------------
                                             Name:
                                             Title:


                                          CITIBANK, N.A.


                                          By:
                                             -----------------------------------
                                             Name:
                                             Title:

                                      -9-
<PAGE>

                                  EXHIBIT A

                Citibank Insured Money Market Deposit Accounts

     Deposits/Withdrawals may be made to the Citibank Money Market Deposit
Account ("MMDA") established under the Escrow Agreement to which this Exhibit is
attached only through the Escrow Account. All transaction and balance reporting
of the MMDA will be included as part of the Escrow Account Statement. Activity
in the MMDA will be reflected as the equivalent of dollars on deposit in a
Citibank Money Market Deposit Account. Deposits/Withdrawals to the MMDA will be
made only as permitted by the Escrow Agreement to which this Exhibit is
attached. The MMDA has certain regulatory restrictions as well as some minimum
requirements:

     1.  By regulation, Citibank, N.A. is required to reserve the right to
require seven days' prior notice of any withdrawals of funds from an account;
provided, however, that, if Citibank, N.A. elects to exercise its right to
require seven days' prior notice, it shall exercise such right as to all such
accounts established.

     2.  A daily balance of $10,000 must be maintained on deposit in the MMDA.
If the MMDA should fall below $10,000 on any day, Citibank, N.A. will be
authorized to transfer the remaining balance to the Escrow Account.

     3.  Rates will be determined by Citibank, N.A. and can be determined by
calling your custody account officer.

     4.  Balances up to $100,000 (total on deposit at Citibank, N.A.) are FDIC-
insured.

                                      A-1
<PAGE>

                                   EXHIBIT B
                           SUMMARY OF CASH RECEIVED
                            NEW PARTICIPANT DEPOSIT
<TABLE>
<CAPTION>
                                                                                                              Date:_________________
Deposit Date:                                                                                             List Number:______________
Investment Date:                                                                                                    Page____ of ____
Batch Number:                                                                                             Approved By:______________
                                                                                                              JOB#:_________________
           For Bank use only

TITLE:________________________________

- ----------------------------------------------------------------------------------------------------------------------
                           *          *AMOUNT OF   *            *TAX ID NO./                          | FOR BANK
        NAME               *DEPOSIT   *SHARES      *ADDRESS     |SOC. SEC. NO.                        * USE ONLY
- ----------------------------------------------------------------------------------------------------------------------
<S>                 <C>    <C>        <C>          <C>          <C>               <C>                 <C>
                           *          *            *            *                 *                   * TAX CODE
                           *          *            *            *                 *                   * EXEMPT(Y/N)
                           *          *            *            *                 *                   * W-9(YR) NRA
                           *          *            *            *                 *                   * W-8(YR)
                           *          *            *            *                 *                   * 1008(87)
                           *          *            *            *                 *                   *
- -------------------------------------------------------------------------------------------------------
Broker              Misc.  *          *            *            * Misc. II        * Misc. III         | TAX CODE
                           *          *            *            *                 *                   * EXEMPT(Y/N)
                           *          *            *            *                 *                   * W-2(YR) NRS
                           *          *            *            *                 *                   * W-8(YR)
                           *          *            *            *                 *                   * 1008(87)
                           *          *            *            *                 *                   *
- -------------------------------------------------------------------------------------------------------
Broker              Misc.  *          *            *            * Misc. II        * Misc. III         | TAX CODE
                                                                                                      * EXEMPT(Y/N)
                           *          *            *            *                 *                   * W-2(YR) NRS
                           *          *            *            *                 *                   * W-8(YR)
                           *          *            *            *                 *                   * 1008(87)
                           *          *            *            *                 *                   *
- -------------------------------------------------------------------------------------------------------
Broker              Misc.  *          *            *            * Misc. II        * Misc. III         | TAX CODE
                           *          *            *            *                 *                   * EXEMPT(Y/N)
                           *          *            *            *                 *                   * W-2(YR) NRS
                           *          *            *            *                 *                   * W-8(YR)
                           *          *            *            *                 *                   * 1000(87)
                           *          *            *            *                 *                   *
- -------------------------------------------------------------------------------------------------------
Broker              Misc.  *          *           *            *  Misc. II        * Misc. III         |
                           *          *           *            *                  *                   *
</TABLE>

                                      B-1
<PAGE>

                                   EXHIBIT C


                     [Form of Offering Termination Notice]



                                                   June __, 1999


Citibank, N.A.
The Citibank Private Bank
120 Broadway, 2/nd/ Floor
New York, New York  10271



Attention:

Dear            :

          Pursuant to Section 5(a) of the Escrow Agreement dated as of June __,
1999 (the "Escrow Agreement") among Ribozyme Pharmaceuticals, Inc., (the
"Company"),  Hambrecht & Quist LLC and you, the Company hereby notifies you of
the termination of the offering of the Shares (as that term is defined in the
Escrow Agreement) and directs you to make payments to subscribers as provided
for in Section 5(a) of the Escrow Agreement.

                              Very truly yours,

                              RIBOZYME PHARMACEUTICALS, INC.



                              By:  _______________________________
                                   Name:
                                   Title:


                                      C-1
<PAGE>

                                   EXHIBIT D

                           [Form of Closing Notice]



                                                   June __, 1999


Citibank, N.A.
The Citibank Private Bank
120 Broadway, 2/nd/ Floor
New York, New York  10271

Attention:

Ladies and Gentlemen:

     Pursuant to Section 5(b) of the Escrow Agreement dated as of June __, 1999,
(the "Escrow Agreement") among Ribozyme Pharmaceuticals, Inc. (the "Company"),
Hambrecht & Quist LLC and you, the Company hereby certifies that it has received
subscriptions for the Shares (as that term is defined in the Escrow Agreement)
and the Company will sell and deliver Shares to the subscribers thereof at a
closing to be held on June __, 1999 (the "Closing Date").  The names of the
subscribers concerned, the number of Shares subscribed for by each of such
subscribers and the related subscription amounts are set forth on Schedule I
annexed hereto.

     Please accept these instructions as standing instructions for the closing
to be held on the Closing Date.  The parties hereto certify that they do not
wish to have a call back regarding these instructions.

     We hereby request that the aggregate subscription
amount be paid to the Placement Agent and us as follows:

     1.        To the Company, $_________;

     2.        To Hambrecht & Quist LLC, $_________; and

     3.        To the Escrow Agent, $_________.


                                      D-1
<PAGE>

      These instructions may be executed in any number of counterparts, each of
which shall be deemed to be an original, and all of which together shall
constitute one and the same instrument.


                              Very truly yours,

                              RIBOZYME PHARMACEUTICALS, INC.



                              By:  _____________________________
                                   Name:
                                   Title:


                              HAMBRECHT & QUIST LLC



                              By:  ______________________________
                                   Name:
                                   Title:


                                      D-2
<PAGE>

                                 SCHEDULE I
                                 ----------


Name of                  Number of            Subscription
Subscriber               Shares               Amount
- ----------               ---------            ------------




<PAGE>

                                   EXHIBIT E


                   [Form of Subscription Termination Notice]



                                                   June __, 1999


Citibank, N.A.
The Citibank Private Bank
120 Broadway,2/nd/ Floor
New York, New York  10271

Attention:

Dear               :

          Pursuant to Section 5(c) of the Escrow Agreement dated as of June __,
1999 (the "Escrow Agreement") among Ribozyme Pharmaceuticals, Inc. (the
"Company"), Hambrecht & Quist LLC and you, the Company hereby notifies you that
the following subscription(s) have been rejected:



                     Amount of             Dollar
                    Subscribed           Amount of
Name of               Shares              Rejected
Subscriber           Rejected           Subscription
- ----------          ----------          ------------



                                    Very truly yours,

                                    RIBOZYME PHARMACEUTICALS, INC.


                                    By:  ____________________________
                                         Name:

                                      E-1
<PAGE>

                                         Title:

                                      E-2
<PAGE>

                                   EXHIBIT F


Fee to Citibank, N.A.:    $____________

                                      F-1


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