1
                                                                     EXHIBIT 4.3

NEITHER THESE SECURITIES NOR THE SECURITIES INTO WHICH THESE SECURITIES ARE
EXERCISABLE HAVE BEEN REGISTERED WITH THE SECURITIES AND EXCHANGE COMMISSION OR
THE SECURITIES COMMISSION OF ANY STATE IN RELIANCE UPON AN EXEMPTION FROM
REGISTRATION UNDER SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"),
AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD EXCEPT PURSUANT TO AN EFFECTIVE
REGISTRATION STATEMENT UNDER THE SECURITIES ACT OR PURSUANT TO AN AVAILABLE
EXEMPTION FROM THE REGISTRATION REQUIREMENTS THEREUNDER AND IN COMPLIANCE WITH
APPLICABLE STATE SECURITIES OR BLUE SKY LAWS.


                              NEOTHERAPEUTICS, INC.

                                 CLOSING WARRANT

Warrant No. C-1                                         Dated: November 19, 1999


         NeoTherapeutics, Inc., a Delaware corporation (the "Company"), hereby
certifies that, for value received, Montrose Investments Ltd., or its registered
assigns ("Holder"), is entitled, subject to the terms set forth below, to
purchase from the Company up to a total of 63,420 shares of common stock, $.001
par value per share (the "Common Stock"), of the Company (each such share, a
"Warrant Share" and all such shares, the "Warrant Shares") at an exercise price
equal to $14.235 per share (as adjusted from time to time as provided in Section
9, the "Exercise Price"), at any time and from time to time from and after the
date hereof and through and including November 19, 2004 (the "Expiration Date"),
and subject to the following terms and conditions:

               1. Registration of Warrant. The Company shall register this
Warrant, upon records to be maintained by the Company for that purpose (the
"Warrant Register"), in the name of the record Holder hereof from time to time.
The Company may deem and treat the registered Holder of this Warrant as the
absolute owner hereof for the purpose of any exercise hereof or any distribution
to the Holder, and for all other purposes, and the Company shall not be affected
by notice to the contrary.

   2

               2. Registration of Transfers and Exchanges.

                  (a) This Warrant may only be transferred pursuant to an
effective registration statement under the Securities Act, to the Company or
pursuant to an available exemption from or in a transaction not subject to the
registration requirements of the Securities Act. In connection with any transfer
of this Warrant other than pursuant to an effective registration statement or to
the Company, the Company may require the transferor thereof to provide to the
Company an opinion of counsel selected by the transferor, the form and substance
of which opinion shall be reasonably satisfactory to the Company, to the effect
that such transfer does not require registration of such Warrant under the
Securities Act Holder agrees to the imprinting, so long as is required by this
Section 2(a), of a legend substantially similar to that first above written on
any New Warrant (as defined below). Any such transferee shall agree in writing
to be bound by the terms of this Warrant and shall have the rights of Holder
under this Warrant.

                  (b) The Company shall register the transfer of any portion of
this Warrant in the Warrant Register, upon surrender of this Warrant, with the
Form of Assignment attached hereto duly completed and signed, to the Transfer
Agent or to the Company at the office specified in or pursuant to Section 3(b).
Upon any such registration or transfer, a new warrant to purchase Common Stock,
in substantially the form of this Warrant (any such new warrant, a "New
Warrant"), evidencing the portion of this Warrant so transferred shall be issued
to the transferee and a New Warrant evidencing the remaining portion of this
Warrant not so transferred, if any, shall be issued to the transferring Holder.
The acceptance of the New Warrant by the transferee thereof shall be deemed the
acceptance of such transferee of all of the rights and obligations of a holder
of a Warrant.

                  (c) This Warrant is exchangeable, upon the surrender hereof by
the Holder to the office of the Company specified in or pursuant to Section 3(b)
for one or more New Warrants, evidencing in the aggregate the right to purchase
the number of Warrant Shares which may then be purchased hereunder. Any such New
Warrant will be dated the date of such exchange.

               3. Duration and Exercise of Warrants.

                  (a) This Warrant shall be exercisable by the registered Holder
on any business day before 8:00 P.M., New York City time, at any time and from
time to time on or after the date hereof to and including the Expiration Date.
At 8:00 P.M., New York City time on the Expiration Date, the portion of this
Warrant not exercised prior thereto shall be and become void and of no value.
Prior to the Expiration Date, the Company may not call or otherwise redeem this
Warrant without the prior written consent of the Holder.

                  (b) Subject to Sections 2(b), 6 and 10, upon surrender of this
Warrant, with the Form of Election to Purchase attached hereto duly completed
and signed, to the Company at its address for notice set forth in Section 13 and
upon payment of the Exercise Price multiplied by the number of Warrant Shares
that the Holder intends to purchase hereunder, in the manner provided hereunder,
all as specified by the Holder in the Form of Election to Purchase, the Company
shall promptly (but in no event later than 3 business days after the Date of
Exercise (as defined herein)) issue or cause to be issued and cause to be
delivered to or upon the written order of the


                                      -2-
   3

Holder and in such name or names as the Holder may designate, a certificate for
the Warrant Shares issuable upon such exercise, free of restrictive legends
except (i) either in the event that a registration statement covering the resale
of the Warrant Shares and naming the Holder as a selling stockholder thereunder
is not then effective or the Warrant Shares are not freely transferable without
volume restrictions pursuant to Rule 144(k) promulgated under the Securities Act
of 1933, as amended (the "Securities Act"), or (ii) if this Warrant shall have
been issued pursuant to a written agreement between the original Holder and the
Company, as required by such agreement. Any person so designated by the Holder
to receive Warrant Shares shall be deemed to have become holder of record of
such Warrant Shares as of the Date of Exercise of this Warrant.

                  A "Date of Exercise" means the date on which the Company shall
have received (i) this Warrant (or any New Warrant, as applicable), with the
Form of Election to Purchase attached hereto (or attached to such New Warrant)
appropriately completed and duly signed, and (ii) payment of the Exercise Price
for the number of Warrant Shares so indicated by the holder hereof to be
purchased.

                  (c) This Warrant shall be exercisable, either in its entirety
or, from time to time, for a portion of the number of Warrant Shares. If less
than all of the Warrant Shares which may be purchased under this Warrant are
exercised at any time, the Company shall issue or cause to be issued, at its
expense, a New Warrant evidencing the right to purchase the remaining number of
Warrant Shares for which no exercise has been evidenced by this Warrant.

               4. Piggyback Registration Rights. During the Effectiveness Period
(as defined in the Registration Rights Agreement, of even date herewith, between
the Company and the original Holder), the Company may not file any registration
statement with the Securities and Exchange Commission (other than registration
statements of the Company filed on Form S-8 or Form S-4, each as promulgated
under the Securities Act, pursuant to which the Company is registering
securities pursuant to a Company employee benefit plan or pursuant to a merger,
acquisition or similar transaction including supplements thereto, but not
additionally filed registration statements in respect of such securities) at any
time when there is not an effective registration statement covering the resale
of the Warrant Shares and naming the Holder as a selling stockholder thereunder,
unless the Company provides the Holder with not less than 20 days notice of its
intention to file such registration statement and provides the Holder the option
to include any or all of the applicable Warrant Shares therein. The piggyback
registration rights granted to the Holder pursuant to this Section shall
continue until all of the Holder's Warrant Shares have been sold in accordance
with an effective registration statement or upon the expiration of the Effective
Period. The Company will pay all registration expenses in connection therewith.

               5. Demand Registration Rights. During the Effectiveness Period if
the Warrant Shares are not registered pursuant to an effective registration
statement, the Holder may make a written request for the registration under the
Securities Act (a "Demand Registration"), of all of the Warrant Shares (the
"Registrable Securities"), and the Company shall use its best efforts to effect
such Demand Registration as promptly as possible, but in any case within 90 days
thereafter. Any request for a Demand Registration shall specify the aggregate
number of Registrable Securities proposed to be sold and shall also specify the
intended method of disposition thereof. The right to


                                      -3-
   4

cause a registration of the Registrable Securities under this Section 5 shall be
limited to one such registration. In any registration initiated as a Demand
Registration, the Company will pay all of its registration expenses in
connection therewith. A Demand Registration shall not be counted as a Demand
Registration hereunder until the registration statement filed pursuant to the
Demand Registration has been declared effective by the Securities and Exchange
Commission and maintained continuously effective for a period of at least 360
days or such shorter period when all Registrable Securities included therein
have been sold in accordance with such registration statement, provided, however
that any days on which such registration statement is not effective or on which
the Holder is not permitted by the Company or any governmental authority to sell
Warrant Shares under such registration statement shall not count towards such
360 day period.

               6. Payment of Taxes. The Company will pay all documentary stamp
taxes attributable to the issuance of Warrant Shares upon the exercise of this
Warrant; provided, however, that the Company shall not be required to pay any
tax which may be payable in respect of any transfer involved in the registration
of any certificates for Warrant Shares or Warrants in a name other than that of
the Holder. The Holder shall be responsible for all other tax liability that may
arise as a result of holding or transferring this Warrant or receiving Warrant
Shares upon exercise hereof.

               7. Replacement of Warrant. If this Warrant is mutilated, lost,
stolen or destroyed, the Company shall issue or cause to be issued in exchange
and substitution for and upon cancellation hereof, or in lieu of and
substitution for this Warrant, a New Warrant, but only upon receipt of evidence
reasonably satisfactory to the Company of such loss, theft or destruction and
indemnity, if requested, satisfactory to it. Applicants for a New Warrant under
such circumstances shall also comply with such other reasonable regulations and
procedures and pay such other reasonable charges as the Company may prescribe.

               8. Reservation of Warrant Shares. The Company covenants that it
will at all times reserve and keep available out of the aggregate of its
authorized but unissued Common Stock, solely for the purpose of enabling it to
issue Warrant Shares upon exercise of this Warrant as herein provided, the
number of Warrant Shares which are then issuable and deliverable upon the
exercise of this entire Warrant, free from preemptive rights or any other actual
contingent purchase rights of persons other than the Holder (taking into account
the adjustments and restrictions of Section 9). The Company covenants that all
Warrant Shares that shall be so issuable and deliverable shall, upon issuance
and the payment of the applicable Exercise Price in accordance with the terms
hereof, be duly and validly authorized, issued and fully paid and nonassessable.

               9. Certain Adjustments. The Exercise Price and number of Warrant
Shares issuable upon exercise of this Warrant are subject to adjustment from
time to time as set forth in this Section 9. Upon each such adjustment of the
Exercise Price pursuant to this Section 9, the Holder shall thereafter prior to
the Expiration Date be entitled to purchase, at the Exercise Price resulting
from such adjustment, the number of Warrant Shares obtained by multiplying the
Exercise Price in effect immediately prior to such adjustment by the number of
Warrant Shares issuable upon exercise of this Warrant immediately prior to such
adjustment and dividing the product thereof by the Exercise Price resulting from
such adjustment. Notwithstanding anything to the contrary set forth herein, no
adjustment shall be made hereunder to the Exercise Price due to (i) the adoption
by the


                                      -4-
   5

Company of a shareholders rights plan, (ii) the creation of "rights" under such
a plan that are evidenced by the shares of Common Stock to which they are
attached, but adjustments would be made if such rights are ever separated from
such shares of Common Stock or otherwise become evidenced by a separate
certificate or if, for any other reason, such rights would entitle the holders
thereof or of the Common Stock to which they attach to receive shares of Common
Stock , (iii) the granting of options or warrants to employees, officers,
directors, consultants and other service providers, and the issuance of shares
upon exercise of options granted, under any stock option plan heretofore or
hereinafter duly adopted by the Company, (iv) shares of Common Stock issuable
upon exercise of currently outstanding options and warrants and upon conversion
of any currently outstanding convertible securities of the Company, in each case
to the extent disclosed in Schedule 2.1(c) to the Securities Purchase Agreement
but not with respect to any amendment or modification thereof, (v) shares of
Common Stock issuable in connection with a Strategic Transaction (as defined in
Section 3.9 of the Securities Purchase Agreement), (vi) an underwritten public
offering of Common Stock resulting in net proceeds to the Company in excess of
$10,000,000, (vii) warrants issuable to Brighton Capital, Ltd. in connection
with the Securities Purchase Agreement and the issuance of shares upon exercise
thereof, (viii) warrants to be issued by the Company to Kingsbridge Capital
Limited to purchase 25,000 shares of Common Stock and the issuance of shares
upon exercise thereof, (ix) the granting of warrants to purchase up to 10,000
shares of Common Stock in connection with equipment leasing or other debt
financing transactions, and (x) the issuance of shares of Common Stock issuable
pursuant to the Private Equity Line of Credit Agreement dated March 27, 1998
between the Company and Kingsbridge Capital Limited.

                  (a) If the Company, at any time while this Warrant is
outstanding, (i) shall pay a stock dividend (except scheduled dividends paid on
outstanding preferred stock as of the date hereof which contain a stated
dividend rate) or otherwise make a distribution or distributions on shares of
its Common Stock or on any other class of capital stock payable in shares of
Common Stock, (ii) subdivide outstanding shares of Common Stock into a larger
number of shares, or (iii) combine outstanding shares of Common Stock into a
smaller number of shares, the Exercise Price shall be multiplied by a fraction
of which the numerator shall be the number of shares of Common Stock (excluding
treasury shares, if any) outstanding before such event and of which the
denominator shall be the number of shares of Common Stock (excluding treasury
shares, if any) outstanding after such event. Any adjustment made pursuant to
this Section shall become effective immediately after the record date for the
determination of stockholders entitled to receive such dividend or distribution
and shall become effective immediately after the effective date in the case of a
subdivision or combination, and shall apply to successive subdivisions and
combinations.

                  (b) In case of any reclassification of the Common Stock or any
compulsory share exchange pursuant to which the Common Stock is converted into
other securities, cash or property, then the Holder shall have the right
thereafter to exercise this Warrant only into the shares of stock and other
securities and property receivable upon or deemed to be held by holders of
Common Stock following such reclassification or share exchange, and the Holder
shall be entitled upon such event to receive such amount of securities or
property equal to the amount of Warrant Shares such Holder would have been
entitled to had such Holder exercised this Warrant immediately prior to such
reclassification or share exchange. The terms of any such reclassification or
share exchange shall include such terms so as to continue to give to the Holder
the right to receive the


                                      -5-
   6

securities or property set forth in this Section 9(b) upon any exercise
following any such reclassification or share exchange.

                  (c) If the Company, at any time while this Warrant is
outstanding, shall distribute to all holders of Common Stock (and not to holders
of this Warrant) evidences of its indebtedness or assets or rights or warrants
to subscribe for or purchase any security (excluding those referred to in
Sections 9(a), (b) and (d)), then in each such case the Exercise Price shall be
determined by multiplying the Exercise Price in effect immediately prior to the
record date fixed for determination of stockholders entitled to receive such
distribution by a fraction of which the denominator shall be the Exercise Price
determined as of the record date mentioned above, and of which the numerator
shall be such Exercise Price on such record date less the then fair market value
at such record date of the portion of such assets or evidence of indebtedness so
distributed applicable to one outstanding share of Common Stock as determined by
the Company's independent certified public accountants that regularly examines
the financial statements of the Company (an "Appraiser").

                  (d) If at any time the Company or any subsidiary thereof, as
applicable with respect to Common Stock Equivalents (as defined below), shall
issue shares of Common Stock or rights, warrants, options or other securities or
debt that is convertible into or exchangeable for shares of Common Stock
("Common Stock Equivalents"), entitling any person or entity to acquire shares
of Common Stock at a price per share less than both the market price of the
Common Stock at the time of issuance and the Exercise Price then in effect (if
the holder of the Common Stock or Common Stock Equivalent so issued shall at any
time, whether by operation of purchase price adjustments, reset provisions,
floating conversion, exercise or exchange prices or otherwise, or due to
warrants, options or rights issued in connection with such issuance at a price
less than the prevailing Exercise Price and market price, such issuance shall be
deemed to have occurred for less than such Exercise Price and market price),
then, forthwith upon such issue or sale, the Exercise Price shall be reduced to
the price (calculated to the nearest cent) determined by multiplying the
Exercise Price in effect immediately prior thereto by a fraction, the numerator
of which shall be the sum of (i) the number of shares of Common Stock
outstanding immediately prior to such issuance, and (ii) the number of shares of
Common Stock which the aggregate consideration received (or to be received,
assuming exercise or conversion in full of such Common Stock Equivalents) for
the issuance of such additional shares of Common Stock would purchase at the
Exercise Price, and the denominator of which shall be the sum of the number of
shares of Common Stock outstanding immediately after the issuance of such
additional shares. For purposes hereof, all shares of Common Stock that are
issuable upon conversion, exercise or exchange of Common Stock Equivalents shall
be deemed outstanding immediately after the issuance of such Common Stock
Equivalents. Such adjustment shall be made whenever such Common Stock or Common
Stock Equivalents are issued. However, upon the expiration of any Common Stock
Equivalents the issuance of which resulted in an adjustment in the Exercise
Price pursuant to this Section, if any such Common Stock Equivalents shall
expire and shall not have been exercised, the Exercise Price shall immediately
upon such expiration be recomputed and effective immediately upon such
expiration be increased to the price which it would have been (but reflecting
any other adjustments in the Exercise Price made pursuant to the provisions of
this Section after the issuance of such Common Stock Equivalents) had the
adjustment of the Exercise Price made upon the issuance of such Common Stock
Equivalents been


                                      -6-
   7

made on the basis of offering for subscription or purchase only that number of
shares of the Common Stock actually purchased upon the exercise of such Common
Stock Equivalents actually exercised.

                  (e) In case of any (1) merger or consolidation of the Company
with or into another Person, or (2) sale by the Company of more than one-half of
the assets of the Company (on a book value basis) in one or a series of related
transactions, or (3) tender or other offer or exchange (whether by the Company
or another Person) pursuant to which holders of Common Stock are permitted to
tender or exchange their shares for other securities, stock, cash or property of
the Company or another Person; then the Holder shall have the right thereafter
to (A) exercise this Warrant for the shares of stock and other securities, cash
and property receivable upon or deemed to be held by holders of Common Stock
following such merger, consolidation or sale, and the Holder shall be entitled
upon such event or series of related events to receive such amount of
securities, cash and property as the Common Stock for which this Warrant could
have been exercised immediately prior to such merger, consolidation or sales
would have been entitled, (B) in the case of a merger or consolidation, (x)
require the surviving entity to issue to the Holder a warrant entitling the
Holder to acquire shares of such entity's common stock, which warrant shall have
terms identical (including with respect to exercise) to the terms of this
Warrant and shall be entitled to all of the rights and privileges set forth
herein and the agreements pursuant to which this Warrant was issued (including,
without limitation, as such rights relate to the acquisition, transferability,
registration and listing of such shares of stock other securities issuable upon
exercise thereof), or (C) in the event of an exchange or tender offer or other
transaction contemplated by clause (3) of this Section, tender or exchange this
Warrant for such securities, stock, cash and other property receivable upon or
deemed to be held by holders of Common Stock that have tendered or exchanged
their shares of Common Stock following such tender or exchange, and the Holder
shall be entitled upon such exchange or tender to receive such amount of
securities, cash and property as the shares of Common Stock for which this
Warrant could have been exercised immediately prior to such tender or exchange
would have been entitled as would have been issued. In the case of clause (B),
the exercise price applicable for the newly issued warrant shall be based upon
the amount of securities, cash and property that each shares of Common Stock
would receive in such transaction and the Exercise Price immediately prior to
the effectiveness or closing date for such transaction. The terms of any such
merger, sale, consolidation, tender or exchange shall include such terms so as
continue to give the Holder the right to receive the securities, cash and
property set forth in this Section upon any conversion or redemption following
such event. This provision shall similarly apply to successive such events.

                  (f) For the purposes of this Section 9, the following clauses
shall also be applicable:

                      (i) Record Date. In case the Company shall take a record
of the holders of its Common Stock for the purpose of entitling them (A) to
receive a dividend or other distribution payable in Common Stock or in
securities convertible or exchangeable into shares of Common Stock, or (B) to
subscribe for or purchase Common Stock or securities convertible or exchangeable
into shares of Common Stock, then such record date shall be deemed to be the
date of the issue or sale of the shares of Common Stock deemed to have been
issued or sold upon the declaration of such dividend or the making of such other
distribution or the date of the granting of such right of subscription or
purchase, as the case may be.

                      (ii) Treasury Shares. The number of shares of Common Stock
outstanding at any given time shall not include shares owned or held by or for
the account of the


                                      -7-
   8

Company, and the disposition of any such shares shall be considered an issue or
sale of Common Stock.

                  (g) All calculations under this Section 9 shall be made to the
nearest cent or the nearest 1/100th of a share, as the case may be.

                  (h) Whenever the Exercise Price is adjusted pursuant to
Section 9(c) above, the Holder, after receipt of the determination by the
Appraiser, shall have the right to select an additional appraiser (which shall
be a nationally recognized accounting firm), in which case the adjustment shall
be equal to the average of the adjustments recommended by each of the Appraiser
and such appraiser. The Holder shall promptly mail or cause to be mailed to the
Company, a notice setting forth the Exercise Price after such adjustment and
setting forth a brief statement of the facts requiring such adjustment. Such
adjustment shall become effective immediately after the record date mentioned
above.

                  (i) If:

                         (i)       the Company shall declare a dividend (or any
                                   other distribution) on its Common Stock; or

                         (ii)      the Company shall declare a special
                                   nonrecurring cash dividend on or a redemption
                                   of its Common Stock; or

                         (iii)     the Company shall authorize the granting to
                                   all holders of the Common Stock rights or
                                   warrants to subscribe for or purchase any
                                   shares of capital stock of any class or of
                                   any rights; or

                         (iv)      the approval of any stockholders of the
                                   Company shall be required in connection with
                                   any reclassification of the Common Stock, any
                                   consolidation or merger to which the Company
                                   is a party, any sale or transfer of all or
                                   substantially all of the assets of the
                                   Company, or any compulsory share exchange
                                   whereby the Common Stock is converted into
                                   other securities, cash or property; or

                         (v)       the Company shall authorize the voluntary
                                   dissolution, liquidation or winding up of the
                                   affairs of the Company,

then the Company shall cause to be mailed to each Holder at their last addresses
as they shall appear upon the Warrant Register, at least 30 calendar days prior
to the applicable record or effective date


                                      -8-
   9

hereinafter specified, a notice stating (x) the date on which a record is to be
taken for the purpose of such dividend, distribution, redemption, rights or
warrants, or if a record is not to be taken, the date as of which the holders of
Common Stock of record to be entitled to such dividend, distributions,
redemption, rights or warrants are to be determined or (y) the date on which
such reclassification, consolidation, merger, sale, transfer or share exchange
is expected to become effective or close, and the date as of which it is
expected that holders of Common Stock of record shall be entitled to exchange
their shares of Common Stock for securities, cash or other property deliverable
upon such reclassification, consolidation, merger, sale, transfer, share
exchange, dissolution, liquidation or winding up; provided, however, that the
failure to mail such notice or any defect therein or in the mailing thereof
shall not affect the validity of the corporate action required to be specified
in such notice.

              10. Payment of Exercise Price. The Holder shall pay the Exercise
Price in one of the following manners:

                  (a) Cash Exercise. The Holder may deliver immediately
available funds; or

                  (b) Cashless Exercise. The Holder may surrender this Warrant
to the Company together with a notice of cashless exercise, in which event the
Company shall issue to the Holder the number of Warrant Shares determined as
follows:

                                    X = Y (A-B)/A

         where:

                                    X = the number of Warrant Shares to be
                                    issued to the Holder.

                                    Y = the number of Warrant Shares with
                                    respect to which this Warrant is being
                                    exercised.

                                    A = the average of the closing sale prices
                                    of the Common Stock for the five (5) trading
                                    days immediately prior to (but not
                                    including) the Date of Exercise.

                                    B = the Exercise Price.

For purposes of Rule 144 promulgated under the Securities Act, it is intended,
understood and acknowledged that the Warrant Shares issued in a cashless
exercise transaction shall be deemed to have been acquired by the Holder, and
the holding period for the Warrant Shares shall be deemed to have been
commenced, on the issue date.

              11. Certain Exercise Restrictions. A Holder may not exercise
this Warrant to the extent such exercise would result in the Holder, together
with any affiliate thereof, beneficially owning (as determined in accordance
with Section 13(d) of the Securities Exchange Act 1934, as amended and the rules
promulgated thereunder) in excess of 9.999% of the then issued and outstanding
shares of Common Stock, including shares of Common Stock issuable upon such
exercise and held by such


                                      -9-
   10

Holder after application of this Section. Since the Holder will not be obligated
to report to the Company the number of shares of Common Stock it may hold at the
time of an exercise hereunder, unless the exercise at issue would result in the
issuance of shares of Common Stock in excess of 9.999% of the then outstanding
shares of Common Stock without regard to any other shares of Common Stock which
may be beneficially owned by the Holder or an affiliate thereof, the Holder
shall have the authority and obligation to determine whether the restriction
contained in this Section will limit any particular exercise hereunder and to
the extent that the Holder determines that the limitation contained in this
Section applies, the determination of which portion of this Warrant is
exercisable shall be the responsibility and obligation of the Holder. If the
Holder has delivered a Form of Election to Purchase for a number of Warrant
Shares that would result in the issuance in excess of the permitted amount
hereunder, the Company shall notify the Holder of this fact and shall honor the
exercise for the maximum portion of this Warrant permitted to be exercised on
such Date of Exercise in accordance with the periods described herein and
disregard the balance of such Form of Election to Purchase, as if never
delivered The provisions of this Section may be waived by a Holder (but only as
to itself and not to any other Holder) upon not less than 61 days prior notice
to the Company. Other Holders shall be unaffected by any such waiver.

              12. Fractional Shares. The Company shall not be required to issue
or cause to be issued fractional Warrant Shares on the exercise of this Warrant.
The number of full Warrant Shares which shall be issuable upon the exercise of
this Warrant shall be computed on the basis of the aggregate number of Warrant
Shares purchasable on exercise of this Warrant so presented. If any fraction of
a Warrant Share would, except for the provisions of this Section, be issuable on
the exercise of this Warrant, the Company shall pay an amount in cash equal to
the Exercise Price multiplied by such fraction.

              13. Notices. Any and all notices or other communications or
deliveries hereunder shall be in writing and shall be deemed given and effective
on the earliest of (i) the date of transmission, if such notice or communication
is delivered via facsimile at the facsimile telephone number specified in this
Section prior to 8:00 p.m. (New York City time) on a business day, (ii) the
business day after the date of transmission, if such notice or communication is
delivered via facsimile at the facsimile telephone number specified in this
Section later than 8:00 p.m. (New York City time) on any date and earlier than
11:59 p.m. (New York City time) on such date, (iii) the business day following
the date of mailing, if sent by nationally recognized overnight courier service,
or (iv) if sent other than by the methods set forth in (i)-(iii) of this
section, upon actual receipt by the party to whom such notice is required to be
given. The addresses for such communications shall be: (i) if to the Company, to
157 Technology Drive, Irvine, CA 92618, Attention: Chief Financial Officer, or
to Facsimile No. (949) 788-6706, or (ii) if to the Holder, to the Holder at the
address or facsimile number appearing on the Warrant Register or such other
address or facsimile number as the Holder may provide to the Company in
accordance with this Section.

               14. Warrant Agent. The Company shall serve as warrant agent under
this Warrant. Upon thirty (30) days' notice to the Holder, the Company may
appoint a new warrant agent. Any corporation into which the Company or any new
warrant agent may be merged or any corporation resulting from any consolidation
to which the Company or any new warrant agent shall


                                      -10-
   11

be a party or any corporation to which the Company or any new warrant agent
transfers substantially all of its corporate trust or shareholders services
business shall be a successor warrant agent under this Warrant without any
further act. Any such successor warrant agent shall promptly cause notice of its
succession as warrant agent to be mailed (by first class mail, postage prepaid)
to the Holder at the Holder's last address as shown on the Warrant Register.

              15. Miscellaneous.

              (a) This Warrant shall be binding on and inure to the benefit of
the parties hereto and their respective successors and assigns. This Warrant may
be amended only in writing signed by the Company and the Holder and their
successors and assigns.

                  (b) Subject to Section 15(a), above, nothing in this Warrant
shall be construed to give to any person or corporation other than the Company
and the Holder any legal or equitable right, remedy or cause under this Warrant.
This Warrant shall inure to the sole and exclusive benefit of the Company and
the Holder.

                  (c) The corporate laws of the State of Delaware shall govern
all issues concerning the relative rights of the Company and its stockholders.
All other questions concerning the construction, validity, enforcement and
interpretation of this Warrant shall be governed by and construed and enforced
in accordance with the internal laws of the State of New York, without regard to
the principles of conflicts of law thereof. The Company and the Holder hereby
irrevocably submit to the exclusive jurisdiction of the state and federal courts
sitting in the City of New York, borough of Manhattan, for the adjudication of
any dispute hereunder or in connection herewith or with any transaction
contemplated hereby or discussed herein, and hereby irrevocably waives, and
agrees not to assert in any suit, action or proceeding, any claim that it is not
personally subject to the jurisdiction of any such court, or that such suit,
action or proceeding is improper. Each of the Company and the Holder hereby
irrevocably waives personal service of process and consents to process being
served in any such suit, action or proceeding by receiving a copy thereof sent
to the Company at the address in effect for notices to it under this instrument
and agrees that such service shall constitute good and sufficient service of
process and notice thereof. Nothing contained herein shall be deemed to limit in
any way any right to serve process in any manner permitted by law.

                  (d) The headings herein are for convenience only, do not
constitute a part of this Warrant and shall not be deemed to limit or affect any
of the provisions hereof.

                  (e) In case any one or more of the provisions of this Warrant
shall be invalid or unenforceable in any respect, the validity and
enforceability of the remaining terms and provisions of this Warrant shall not
in any way be affected or impaired thereby and the parties will attempt in good
faith to agree upon a valid and enforceable provision which shall be a
commercially reasonable substitute therefor, and upon so agreeing, shall
incorporate such substitute provision in this Warrant.


                                      -11-
   12

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK,
                             SIGNATURE PAGE FOLLOWS]

   13

                  IN WITNESS WHEREOF, the Company has caused this Warrant to be
duly executed by its authorized officer as of the date first indicated above.


                                NEOTHERAPEUTICS, INC.

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


                                      -13-
   14

                          FORM OF ELECTION TO PURCHASE

(To be executed by the Holder to exercise the right to purchase shares of Common
Stock under the foregoing Warrant)

To NeoTherapeutics, Inc.:

         In accordance with the Warrant enclosed with this Form of Election to
Purchase, the undersigned hereby irrevocably elects to purchase _____________
shares of common stock, $.001 par value per share, of NeoTherapeutics, Inc. (the
"Common Stock") and , if such Holder is not utilizing the cashless exercise
provisions set forth in this Warrant, encloses herewith $________ in cash,
certified or official bank check or checks, which sum represents the aggregate
Exercise Price (as defined in the Warrant) for the number of shares of Common
Stock to which this Form of Election to Purchase relates, together with any
applicable taxes payable by the undersigned pursuant to the Warrant.

         The undersigned requests that certificates for the shares of Common
Stock issuable upon this exercise be issued in the name of:

                                            PLEASE INSERT SOCIAL SECURITY OR
                                            TAX IDENTIFICATION NUMBER

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

- --------------------------------------------------------------------------------
                         (Please print name and address)


         If the number of shares of Common Stock issuable upon this exercise
shall not be all of the shares of Common Stock which the undersigned is entitled
to purchase in accordance with the enclosed Warrant, the undersigned requests
that a New Warrant (as defined in the Warrant) evidencing the right to purchase
the shares of Common Stock not issuable pursuant to the exercise evidenced
hereby be issued in the name of and delivered to:


- --------------------------------------------------------------------------------
                         (Please print name and address)

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

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



Dated:                      ,        Name of Holder:
      ---------------------  ----
                                      (Print)
                                             -----------------------------------
                                      (By:)
                                           -------------------------------------
                                      (Name:)
                                      (Title:)
                                      (Signature must conform in all respects to
                                      name of holder as specified on the face of
                                      the Warrant)

   15

                               FORM OF ASSIGNMENT

           [To be completed and signed only upon transfer of Warrant]

         FOR VALUE RECEIVED, the undersigned hereby sells, assigns and transfers
unto ________________________________ the right represented by the within
Warrant to purchase ____________ shares of Common Stock of NeoTherapeutics, Inc.
to which the within Warrant relates and appoints ________________ attorney to
transfer said right on the books of NeoTherapeutics, Inc. with full power of
substitution in the premises.

Dated:

          ,
- ----------  ----

                            ---------------------------------------
                            (Signature must conform in all respects to name of
                            holder as specified on the face of the Warrant)

                            ---------------------------------------
                            Address of Transferee

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

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

In the presence of:

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