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Exhibit 10.16


                               COMMERCIAL GUARANTY

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    Principal          Loan Date         Maturity          Loan No.

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  Call / Coll        Account           Officer          Initials
                                          RK             /s/ RK
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           References in the boxes above are for Lender's use only and
               do not limit the applicability of this document to
                   any particular loan or item. Any item above
                  containing "***" has been omitted due to text
                               length limitations.

Borrower:                                      Lender:
    Amexdrug Corporation; Dermagen, Inc.;        National Bank of California
    Biorx Pharmaceuticals, Inc.; Royal           Corporate Banking Department
    Health Care, Inc.; and Allied Med Inc.       145 South Fairfax Avenue
    8909 West Olympic Boulevard, Suite 208       Los Angeles, CA 90036
    Beverly Hills, CA 90211


Guarantor:   Nora Y. Amin
             369 South Doheny Drive, Suite 326
             Beverly Hills, CA  90211

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CONTINUING  GUARANTEE  OF  PAYMENT  AND  PERFORMANCE.   For  good  and  valuable
consideration,  Guarantor  absolutely and  unconditionally  guarantees  full and
punctual payment and satisfaction of the Indebtedness of Borrower, or any one or
more of them, to Lender,  and the  performance  and discharge of all  Borrower's
obligations  under the Note and the  Related  Documents.  This is a guaranty  of
payment  and  performance  and not of  collection,  so Lender can  enforce  this
Guaranty against Guarantor even when Lender has not exhausted  Lender's remedies
against anyone else obligated to pay the  Indebtedness or against any collateral
securing  the  Indebtedness,   this  Guaranty  or  any  other  Guaranty  of  the
Indebtedness.  Guarantor  will make any,  payments  to Lender or its  order,  on
demand,  in legal  tender of the United  States of America,  in same-day  funds,
without  set-off  or  deduction  or  counterclaim,  and will  otherwise  perform
Borrower's  obligations  under  the  Note  and  related  Documents.  Under  this
Guaranty,  Guarantor's  liability is unlimited and  Guarantor's  obligations are
continuing.

INDEBTEDNESS.  The word "Indebtedness" as used in this Guaranty means all of the
principal  amount  outstanding  from time to time and at any one or more  times,
accrued  unpaid  interest  thereon and all  collection  costs and legal expenses
related  thereto  permitted by law,  attorneys'  fees,  arising from any and all
debts,.  liabilities  and  obligations  of every nature or form, now existing or
hereafter  arising or acquired,  that Borrower  individually  or collectively or
interchangeably with others, owes or will owe Lender.  "Indebtedness"  includes,
without limitation, loans, advances, debts, overdraft indebtedness,  credit card
indebtedness, lease obligations,  liabilities and obligations under any interest
rate protection  agreements or foreign currency exchange agreements or commodity
price protection agreements,  other obligations, and liabilities of Borrower, or
any one or more of them, and any present or future judgments  against  Borrower,
or any one or more of them,  future advances,  loans or transactions that renew,
extend, modify,  refinance,  consolidate or substitute these debts,  liabilities
and obligations whether: voluntarily or involuntarily incurred; due or to become
due by their  terms or  acceleration;  absolute  or  contingent;  liquidated  or
unliquidated;  determined  or  undetermined;  direct  or  indirect;  primary  or
secondary in nature or arising from a guaranty or surety;  secured or unsecured;
joint  or  several  or  joint  and  several;   evidenced  by  a  negotiable   or
non-negotiable instrument or writing; originated by Lender or another or others;
barred or  unenforceable  against  Borrower for any reason  whatsoever;  for any
transactions  that may be voidable  for any reason  (such as infancy,  insanity,
ultra vires or otherwise);  and originated then reduced or extinguished and then
afterwards increased or reinstated.

If  Lender  presently  holds  one or  more  guaranties,  or  hereafter  receives
additional guaranties from Guarantor, Lender's rights under all guaranties shall
be cumulative.  This Guaranty shall not (unless  specifically  provided below to
the  contrary)  affect or  invalidate  any such  other  guaranties.  Guarantor's
liability  will be  Guarantor's  aggregate  liability  under  the  terms of this
Guaranty and any such other unterminated guaranties.

CONTINUING  GUARANTY.  THIS IS A  "CONTINUING  GUARANTY"  UNDER WHICH  GUARANTOR
AGREES TO GUARANTEE THE FULL AND PUNCTUAL PAYMENT,  PERFORMANCE AND SATISFACTION
OF THE  INDEBTEDNESS  OF BORROWER,  OR ANY ONE OR MORE OF THEM,  TO LENDER,  NOW
EXISTING OR HEREAFTER  ARISING OR  ACQUIRED,  ON AN OPEN AND  CONTINUING  BASIS.
ACCORDINGLY,  ANY  PAYMENTS  MADE ON THE  INDEBTEDNESS  WILL  NOT  DISCHARGE  OR
DIMINISH  GUARANTOR'S  OBLIGATIONS  AND  LIABILITY  UNDER THIS  GUARANTY FOR ANY
REMAINING AND SUCCEEDING  INDEBTEDNESS  EVEN WHEN ALL OR PART OF THE OUTSTANDING
INDEBTEDNESS MAY BE A ZERO BALANCE FROM TIME TO TIME.

DURATION OF GUARANTY.  This  Guaranty  will take effect when  received by Lender
without the necessity of any acceptance by Lender, or any notice to Guarantor or
to Borrower, and will continue in full force until all the Indebtedness incurred
or contracted  before  receipt by Lender of any notice of revocation  shall have
been  fully  and  finally  paid  and  satisfied  and  all of  Guarantor's  other
obligations  under this Guaranty shall have been performed in full. If Guarantor
elects to revoke this Guaranty, Guarantor may only do so in writing. Guarantor's
written  notice of revocation  must be mailed to Lender,  by certified  mail, at
Lender's  address  listed  above or such other place as Lender may  designate in
writing. Written revocation of this Guaranty will apply only to new Indebtedness
created after actual receipt by Lender of 'Guarantor's  written revocation.  For
this  purpose  and  without  limitation,  the term "new  Indebtedness"  does not
include  the  Indebtedness  which  at  the  time  of  notice  of  revocation  is
contingent,  unliquidated,  undetermined  or not due  and  which  later  becomes
absolute,   liquidated,   determined  or  due.  For  this  purpose  and  without
limitation,  "new Indebtedness" does not include all or part of the Indebtedness
that is:  incurred by Borrower prior to revocation;  incurred under a commitment
that became binding before revocation; any renewals, extensions,  substitutions,
and  modifications  of the  Indebtedness.  This Guaranty shall bind  Guarantor's
estate as to the Indebtedness created both before and after Guarantor's death or
incapacity,  regardless of Lender's actual notice of Guarantor's death.  Subject
to  the  foregoing,   Guarantor's  executor  or  administrator  or  other  legal
representative may terminate this Guaranty in the same manner in which Guarantor
might  have  terminated  it and with  the  same  effect.  Release  of any  other
guarantor or  termination of any other  guaranty of the  Indebtedness  shall not
affect the  liability  of Guarantor  under this  Guaranty.  A revocation  Lender
receives from any one or more  Guarantors  shall not affect the liability of any
remaining  Guarantors under this Guaranty,  Guarantor's  obligations  under this
Guaranty shall be in addition to any of Guarantor's obligations, or any of them,
under any other guaranties of the Indebtedness or any other person heretofore or
hereafter  given to Lender unless such other  guaranties are modified or revoked
in writing;  and this Guarantor  shall not,  unless  provided in this -Guaranty,
affect, invalidate, or supersede any such other guaranty. It is anticipated that
fluctuations may occur in the aggregate  amount of the  Indebtedness  covered by
this  Guaranty,  and  Guarantor   specifically   acknowledges  and  agrees  that
reductions  in the amount of the  Indebtedness,  even to zero  dollars  ($0.00),
shall not constitute a termination  of this  Guaranty.  This Guaranty is binding
upon Guarantor and Guarantor's  heirs,  successors and assigns so long as any of
the  Indebtedness  remains unpaid and even though the Indebtedness may from time
to time be zero dollars ($0.00).

OBLIGATIONS  OF MARRIED  PERSONS.  Any  married  person who signs this  Guaranty
hereby  expressly  agrees that  recourse  under this Guaranty may be had against
both his or her separate property and community property.

GUARANTOR'S  AUTHORIZATION TO LENDER. Guarantor authorizes Lender, either before
or after any revocation  hereof,  without notice or demand and without lessening
Guarantor's  liability  under  this  Guaranty,  from time to time:  (A) prior to
revocation  as set  forth  above,  to make  one or more  additional  secured  or
unsecured loans to Borrower,  to, lease equipment or other goods to Borrower, or
otherwise to extend  additional  credit to Borrower;  (B) to alter,  compromise,
renew,  extend,  accelerate,  or otherwise change one or more times the time for
payment  or other  terms of the  Indebtedness  or any part of the  Indebtedness,
including  increases and decreases of the rate of interest on the  Indebtedness;
extensions  may be repeated and may be for longer than the  original  loan term;
(C) to  take  and  hold  security  for  the  payment  of  this  Guaranty  or the
Indebtedness,  and exchange, enforce, waive, subordinate,  fail or decide not to
perfect, and release any such security,  with or without the substitution of new
collateral; (D) to release,  substitute,  agree not to sue, or deal with any one
or more of Borrower's sureties,  endorsers,  or other guarantors on any terms or



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                               COMMERCIAL GUARANTY
Loan No: 930610000                 (Continued)                            Page 2
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in any manner Lender may choose; (E) to determine how, when and what application
of payments  and credits  shall be made on the  Indebtedness;  (F) to apply such
security  and  direct  the order or manner of sale  thereof,  including  without
limitation,  any  nonjudicial  sale  permitted  by the terms of the  controlling
security  agreement or deed of trust, as Lender in its discretion may determine;
(G) to sell, transfer,  assign or grant participations in all or any part of the
Indebtedness; and (H) to assign or transfer this Guaranty in whole or in part.

GUARANTOR'S REPRESENTATIONS AND WARRANTIES. Guarantor represents and warrants to
Lender that (A) no  representations  or agreements of any kind have been made to
Guarantor  which would  limit or qualify in any way the terms of this  Guaranty;
(B) this  Guaranty is executed at  Borrower's  request and not at the request of
Lender;  (C)  Guarantor  has full power,  right and authority to enter into this
Guaranty;  (D) the provisions of this Guaranty do not conflict with or result in
a default under any agreement or other instrument  binding upon Guarantor and do
not  result  in a  violation  of any  law,  regulation,  court  decree  or order
applicable to Guarantor;  (E) Guarantor has not and will not,  without the prior
written consent of Lender, sell, lease, assign, encumber, hypothecate, transfer,
or otherwise dispose of all or substantially  all of Guarantor's  assets, or any
interest therein;  (F) upon Lender's  request,  Guarantor will provide to Lender
financial and credit  information  in form  acceptable  to Lender,  and all such
financial  information  which  currently  has  been,  and all  future  financial
information  which will be provided to Lender is and will be true and correct in
all material respects and fairly present  Guarantor's  financial condition as of
the dates the financial information is provided;  (G) no material adverse change
has  occurred  in  Guarantor's  financial  condition  since the date of the most
recent financial  statements  provided to Lender and no event has occurred which
may  materially  adversely  affect  Guarantor's  financial  condition;   (H)  no
litigation,  claim,  investigation,  administrative proceeding or similar action
(including  those for unpaid taxes) against  Guarantor is pending or threatened;
(I) Lender has made no representation to Guarantor as to the creditworthiness of
Borrower;  and (J) Guarantor has  established  adequate  means of obtaining from
Borrower  on a  continuing  basis  information  regarding  Borrower's  financial
condition.  Guarantor agrees to keep adequately  informed from such means of any
facts,  events, or circumstances which might in any way affect Guarantor's risks
under this Guaranty,  and Guarantor  further  agrees that,  absent a request for
information,  Lender  shall have no  obligation  to  disclose to  Guarantor  any
information  or documents  acquired by Lender in the course of its  relationship
with Borrower.

GUARANTOR'S  WAIVERS.  Except as prohibited by applicable law,  Guarantor waives
any right to require Lender to (A) make any  presentment,  protest,  demand,  or
notice of any kind,  including notice of change of any terms of repayment of the
Indebtedness,  default by Borrower or any other guarantor or surety,  any action
or nonaction  taken by  Borrower,  Lender,  or any other  guarantor or surety of
Borrower, or the creation of new or additional Indebtedness; (B) proceed against
any person, including Borrower, before proceeding against Guarantor; (C) proceed
against any collateral for the Indebtedness,  including  Borrower's  collateral,
before proceeding against Guarantor; (D) apply any payments or proceeds received
against the Indebtedness in any order;  (E) give notice of the terms,  time, and
place of any sale of the collateral  pursuant to the Uniform  Commercial Code or
any other law  governing  such.  sale;  (F) disclose any  information  about the
Indebtedness, the Borrower, the collateral, or any other guarantor or surety, or
about any action or nonaction  of Lender;  or (G) pursue any remedy or course of
action in Lender's power whatsoever.

Guarantor  also waives any and all rights or  defenses  arising by reason of (H)
any  disability or other defense of Borrower,  any other  guarantor or surety or
any other  person;  (I) the  cessation  from any cause  whatsoever,  other  than
payment in full, of the  Indebtedness;  (J) the  application  of proceeds of the
Indebtedness  by Borrower for purposes  other than the purposes  understood  and
intended by  Guarantor  and Lender;  (K) any act of  omission or  commission  by
Lender which  directly or indirectly  results in or contributes to the discharge
of Borrower or any other guarantor or surety, or the  Indebtedness,  or the loss
or release of any  collateral by operation of law or otherwise;  (L) any statute
of limitations in any action under this Guaranty or on the Indebtedness;  or (M)
any modification or change in terms of the Indebtedness,  whatsoever,  including
without limitation, the renewal, extension, acceleration, or other change in the
time payment of the Indebtedness is due and any change in the interest rate, and
including  any such  modification  or change in terms after  revocation  of this
Guaranty on the Indebtedness incurred prior to such revocation.

Guarantor waives all rights of subrogation, reimbursement,  indemnification, and
contribution  and any other rights and defenses that are or may become available
to  Guarantor  by  reason  of  California  Civil  Code  Sections  2787 to  2855,
inclusive.

Guarantor  waives all rights and any  defenses  arising  out of an  election  of
remedies  by  Lender  even  though  that the  election  of  remedies,  such as a
non-judicial  foreclosure with respect to security for a guaranteed  obligation,
has  destroyed  Guarantor's  rights of  subrogation  and  reimbursement  against
Borrower by operation of Section 580d of the California  Code of Civil Procedure
or otherwise.

Guarantor  waives  all rights  and  defenses  that  Guarantor  may have  because
Borrower's  obligation  is secured by real  property.  This  means  among  other
things:  (N) Lender may collect from Guarantor  without first foreclosing on any
real  or  personal  property  collateral  pledged  by  Borrower.  (0) If  Lender
forecloses on any real property  collateral pledged by Borrower:  (1) the amount
of  Borrower's  obligation  may be  reduced  only by the  price  for  which  the
collateral is sold at the foreclosure sale, even if the collateral is worth more
than the sale price.  (2) Lender may collect from Guarantor  even if Lender,  by
foreclosing on the real property  collateral,  has destroyed any right Guarantor
may have to collect from  Borrower.  This is an  unconditional  and  irrevocable
waiver  of any  rights  and  defenses  Guarantor  may  have  because  Borrower's
obligation is secured by real property.  These rights and defenses include,  but
are not limited to, any rights and defenses based upon Section 580a, 580b, 580d,
or 726 of the Code of Civil Procedure.

Guarantor  understands and agrees that the foregoing  waivers are  unconditional
and  irrevocable  waivers of substantive  rights and defenses to which Guarantor
might otherwise be entitled under state and federal law. The rights and defenses
waived  include,  without  limitation,  those  provided  by  California  laws of
suretyship and guaranty, anti-deficiency laws, and the Uniform Commercial -Code.
Guarantor  acknowledges  that Guarantor has provided these waivers of rights and
defenses with the intention that they be fully relied upon by Lender.  Guarantor
further  understands and agrees that this Guaranty is a separate and independent
contract between Guarantor and Lender,  given for full and ample  consideration,
and is enforceable on its own terms.  Until all of the  Indebtedness  is paid in
full,  Guarantor  waives any right to  enforce  any  remedy  Guarantor  may have
against the  Borrower  or any other  guarantor,  surety,  or other  person,  and
further,  Guarantor  waives any right to  participate  in any collateral for the
Indebtedness now or hereafter held by Lender.

Guarantor's  Understanding  With  Respect To Waivers.  'Guarantor  warrants  and
agrees that each of the waivers  set forth above is made with  Guarantor's  full
knowledge  of  its   significance   and   consequences   and  that,   under  the
circumstances,  the waivers are  reasonable and not contrary to public policy or
law. If any such waiver is  determined to be contrary to any  applicable  law or
public policy,  such waiver shall be effective  only to the extent  permitted by
law or public policy.

Subordination  of  Borrower's  Debts to  Guarantor.  Guarantor  agrees  that the
Indebtedness,  whether now existing or hereafter  created,  shall be superior to
any claim that 'Guarantor may now have or hereafter  acquire  against  Borrower,
whether  or  not  Borrower   becomes   insolvent.   Guarantor  hereby  expressly
subordinates  any claim  Guarantor may have against  Borrower,  upon any account
whatsoever, to any claim that Lender may now or hereafter have against Borrower.
In the event of insolvency and consequent liquidation of the assets of Borrower,
through bankruptcy,  by an assignment for the benefit of creditors, by voluntary
liquidation,  or otherwise,  the assets of Borrower applicable to the payment of
the  claims of both  Lender and  Guarantor  shall be paid to Lender and shall be
first  applied by Lender to the  Indebtedness,  Guarantor  does hereby assign to
Lender all claims which it may have or acquire  against  Borrower or against any
assignee or trustee in  bankruptcy  of  Borrower,  provided  however,  that such
assignment  shall be effective  only for the 'purpose of assuring to Lender full
payment in legal tender of the Indebtedness. If Lender so requests, any notes or



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                               COMMERCIAL GUARANTY
Loan No: 930610000                 (Continued)                            Page 3
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credit  agreements  now or  hereafter  evidencing  any debts or  obligations  of
Borrower to Guarantor shall be marked with a legend that the same are subject to
this Guaranty and shall be delivered to Lender.  Guarantor agrees, and Lender is
hereby authorized, in the name of Guarantor, from time to time to file financing
statements and continuation statements and to execute documents and to take such
other actions as Lender deems necessary or appropriate to perfect,  preserve and
enforce its rights under this Guaranty.

Miscellaneous  Provisions.  The following miscellaneous provisions are a part of
this Guaranty:

AMENDMENTS. This Guaranty, together with any Related Documents,  constitutes the
entire understanding and agreement of the parties as to the matters set forth in
this Guaranty. No alteration of or amendment to this Guaranty shall be effective
unless given in writing and signed by the party or parties  sought to be charged
or bound by the alteration or amendment.

ARBITRATION.  Borrower and Guarantor and Lender agree that all disputes, claims,
and controversies  between them whether  individual,  joint, or class in nature,
arising from this Guaranty or otherwise,  including without limitation  contract
and tort  disputes,  shall be  arbitrated  pursuant to the Rules of the American
Arbitration  Association in effect at the time the claim is filed,  upon request
of either party. No act to take or dispose of any Collateral  shall constitute a
waiver  of this  arbitration  agreement  or be  prohibited  by this  arbitration
agreement. This includes,  without limitation,  obtaining injunctive relief or a
temporary restraining order; invoking a power of sale under any deed of trust or
mortgage;  obtaining  a writ of  attachment  or  imposition  of a  receiver;  or
exercising  any  rights  relating  to  personal  property,  including  taking or
disposing of such property with or without  judicial process pursuant to Article
9 of the  Uniform  Commercial  Code.  Any  disputes,  claims,  or  controversies
concerning  the  lawfulness  or  reasonableness  of any act,  or exercise of any
right,  concerning any Collateral,  including any claim to rescind,  reform,  or
otherwise  modify  any  agreement  relating  to the  Collateral,  shall  also be
arbitrated,  provided  however  that no  arbitrator  shall have the right or the
power to enjoin or restrain  any act of any party!  Borrower and  Guarantor  and
Lender agree that in the event of an action for judicial foreclosure pursuant to
California Code of Civil Procedure  Section 726, or any similar provision in any
other state,  the commencement of such an action will not constitute a waiver of
the right to arbitrate and the court shall refer, to arbitration as much of such
action,  including  counterclaims,  as lawfully may be referred to  arbitration.
Judgment upon any award  rendered by any  arbitrator may be entered in any court
having  jurisdiction.  Nothing in this  Guaranty  shall  preclude any party from
seeking equitable relief from a court of competent jurisdiction.  The statute of
limitations,  estoppel,  waiver,  laches,  and  similar  doctrines  which  would
otherwise be applicable  in an action  brought by a party shall be applicable in
any arbitration  proceeding,  and the commencement of an arbitration  proceeding
shall be deemed the  commencement of an action for these  purposes.  The Federal
Arbitration Act shall apply to the construction, interpretation, and enforcement
of this arbitration provision.

ATTORNEYS' FEES;  EXPENSES.  Guarantor agrees to pay upon demand all of Lender's
costs and  expenses,  including  Lender's  attorneys'  fees and  Lender's  legal
expenses,  incurred in connection with the enforcement of this Guaranty.  Lender
may hire or pay someone else to help enforce this Guaranty,  and Guarantor shall
pay the costs and  expenses  of such  enforcement.  Costs and  expenses  include
Lender's  attorneys' fees and legal expenses  whether or not there is a lawsuit,
including  attorneys'  fees  and  legal  expenses  for  bankruptcy   proceedings
(including  efforts  to modify  or vacate  any  automatic  stay or  injunction),
appeals, and any anticipated  post-judgment collection services.  Guarantor also
shall pay all court  costs and such  additional  fees as may be  directed by the
court.

CAPTION HEADINGS. Caption headings in this Guaranty are for convenience purposes
only  and are not to be used to  interpret  or  define  the  provisions  of this
Guaranty.

GOVERNING  LAW.  This  Guaranty  will be governed by federal law  applicable  to
Lender and, to the extent not preempted by federal law, the laws of the State of
California without regard to its conflicts of law provisions.

CHOICE OF VENUE. If there is a lawsuit,  Guarantor  agrees upon Lender's request
to submit to the  jurisdiction  of the courts of Los  Angeles  County,  State of
California.

INTEGRATION.  Guarantor  further  agrees  that  Guarantor  has  read  and  fully
understands the terms of this Guaranty;  Guarantor has had the opportunity to be
advised by  Guarantor's  attorney  with respect to this  Guaranty;  the Guaranty
fully  reflects  Guarantor's  intentions  and parol  evidence is not required to
interpret the terms of this Guaranty.  Guarantor  hereby  indemnifies  and holds
Lender harmless from all losses, claims,  damages, and costs (including Lender's
attorneys'  fees)  suffered  or  incurred by Lender as a result of any breach by
Guarantor of the warranties, representations and agreements of this paragraph.

INTERPRETATION. In all cases where there is more than one Borrower or Guarantor,
then all words used in this  Guaranty  in the  singular  shall be deemed to have
been used in the plural where the context and construction so require; and where
there is more than one Borrower  named in this Guaranty or when this Guaranty is
executed  by more than one  Guarantor,  the  words  "Borrower"  and  "Guarantor"
respectively  shall mean all and any one or more of them. The words "Guarantor,"
"Borrower," and "Lender" include the heirs, successors, assigns, and transferees
of each of them.  If a court finds that any  provision  of this  Guaranty is not
valid or should not be enforced, that fact by itself will not mean that the rest
of this 'Guaranty will not be valid or enforced. Therefore, a court will enforce
the rest of the provisions of this Guaranty even if a provision of this Guaranty
may be found to be invalid or  unenforceable.  If any one or more of Borrower or
Guarantor  are  corporations,  partnerships,  limited  liability  companies,  or
similar  entities,  it is not necessary for Lender to inquire into the powers of
Borrower or Guarantor or of the  officers,  directors,  partners,  managers,  or
other agents acting or purporting to act on their behalf,  and any  indebtedness
made or created in reliance upon the professed  exercise of such powers shall be
guaranteed under this Guaranty.

NOTICES.  Any notice  required to be given under this Guaranty shall be given in
writing,  and,  except for revocation  notices by Guarantor,  shall be effective
when  actually  delivered,  when  actually  received  by  telefacsimile  (unless
otherwise  required  by  law),  when  deposited  with  a  nationally  recognized
overnight courier,  or, if mailed,  when deposited in the United States mail, as
first class,  certified or  registered  mail  postage  prepaid,  directed to the
addresses shown near the beginning of this Guaranty.  All revocation  notices by
Guarantor  shall be in writing and shall be effective upon delivery to Lender as
provided in the section of this Guaranty  entitled  "DURATION OF GUARANTY."  Any
party may change its address for notices  under this  Guaranty by giving  formal
written notice to the other parties,  specifying  that the purpose of the notice
is to change the party's address. For notice purposes,  Guarantor agrees to keep
Lender informed at all times of Guarantor's  current  address.  Unless otherwise
provided or required  by law,  if there is more than one  Guarantor,  any notice
given by Lender to any Guarantor is deemed to be notice given to all Guarantors.

NO WAIVER BY LENDER.  Lender shall not be deemed to have waived any rights under
this  Guaranty  unless such waiver is given in writing and signed by Lender.  No
delay or omission on the part of Lender in exercising any right shall operate as
a waiver of such right or any other right.  A waiver by Lender of a provision of
this  Guaranty  shall not  prejudice or  constitute  a waiver of Lender's  right
otherwise to demand strict compliance with that provision or any other provision
of this Guaranty.  No prior waiver by Lender,  nor any course of dealing between
Lender and Guarantor,  shall constitute a waiver of any of Lender's rights or of
any of  Guarantor's  obligations  as to any future  transactions.  Whenever  the
consent of Lender is required under this Guaranty,  the granting of such consent
by Lender in any instance shall not constitute  continuing consent to subsequent
instances  where such  consent is required  and in all cases such consent may be
granted or withheld in the sole discretion of Lender.


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                               COMMERCIAL GUARANTY
Loan No: 930610000                 (Continued)                            Page 4
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SUCCESSORS AND ASSIGNS.  Subject to any  limitations  stated in this Guaranty on
transfer of Guarantor's interest,  this Guaranty shall be binding upon and inure
to the benefit of the parties, their successors and assigns.

WAIVE JURY.  To the extent  permitted by  applicable  law,  Lender and Guarantor
hereby  waive  the  right  to any  jury  trial  in any  action,  proceeding,  or
counterclaim brought by either Lender or Guarantor against the other.

Definitions.  The following capitalized words and terms shall have the following
meanings when used in this Guaranty. Unless specifically stated to the contrary,
all  references  to dollar  amounts  shall mean  amounts in lawful  money of the
United States of America. Words and terms used in the singular shall include the
plural,  and the plural shall include the singular,  as the context may require.
Words and terms not otherwise  defined in this Guaranty  shall have the meanings
attributed to such terms in the Uniform Commercial Code:

BORROWER. The word "Borrower" means Amexdrug Corporation;  Dermagen, Inc.; Biorx
Pharmaceuticals, Inc.; Royal Health Care, Inc.; and Allied Med Inc. and includes
all  co-signers  and  co-makers  signing the Note and all their  successors  and
assigns.

GUARANTOR. The word "Guarantor" means everyone signing this Guaranty,  including
without  limitation Nora Y. Amin, and in each case, any signer's  successors and
assigns.

GUARANTY. The word "Guaranty" means this guaranty from Guarantor to Lender.

INDEBTEDNESS. The word "Indebtedness" means Borrower's indebtedness to Lender as
more particularly described in this Guaranty.

LENDER. The word "Lender" means National Bank of California,  its successors and
assigns.

NOTE.  The word "Note" means and includes  without  limitation all of Borrower's
promissory notes and/or credit agreements evidencing Borrower's loan obligations
in favor of Lender, together with .all renewals of, extensions of, modifications
of, refinancings of, consolidations of and substitutions for promissory notes or
credit agreements.

RELATED  DOCUMENTS.  The words "Related  Documents"  mean all promissory  notes,
credit  agreements,  loan  agreements,   environmental  agreements,  guaranties,
security  agreements,  mortgages,  deeds of trust,  security  deeds,  collateral
mortgages, and all other instruments,  agreements and documents,  whether now or
hereafter existing, executed in connection with the Indebtedness. EACH

UNDERSIGNED  GUARANTOR  ACKNOWLEDGES  HAVING  READ  ALL THE  PROVISIONS  OF THIS
GUARANTY AND AGREES TO ITS TERMS. IN ADDITION,  EACH GUARANTOR  UNDERSTANDS THAT
THIS  GUARANTY IS  EFFECTIVE  UPON  GUARANTOR'S  EXECUTION  AND DELIVERY OF THIS
GUARANTY TO LENDER AND THAT THE GUARANTY WILL CONTINUE  UNTIL  TERMINATED IN THE
MANNER  SET  FORTH IN THE  SECTION  TITLED  "DURATION  OF  GUARANTY".  NO FORMAL
ACCEPTANCE BY LENDER IS NECESSARY TO MAKE THIS GUARANTY EFFECTIVE. THIS GUARANTY
IS DATED JUNE 23, 2008.

GUARANTOR:

 /s/ Nora Y. Amin
 ----------------
 Nora Y. Amin





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