Document:

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                                                                   EXHIBIT 4.3

THE SECURITIES REPRESENTED HEREBY HAVE BEEN ACQUIRED IN A TRANSACTION NOT
INVOLVING ANY PUBLIC OFFERING AND HAVE NOT BEEN REGISTERED UNDER THE SECURITIES
ACT OF 1933 OR THE SECURITIES LAWS OF ANY STATE. SUCH SECURITIES MAY NOT BE SOLD
OR TRANSFERRED IN THE ABSENCE OF SUCH REGISTRATION OR AN EXEMPTION THEREFROM
UNDER SAID ACT AND LAWS.

                      AMERICAN PSYCH SYSTEMS HOLDINGS, INC.

                     -----------------------------------
                             STOCK PURCHASE WARRANT
                     -----------------------------------

                                 August 18, 2000

     1. GRANT. AMERICAN PSYCH SYSTEMS HOLDINGS, INC., a Delaware corporation
(hereinafter the "Company"), for value received hereby grants to KENNETH A.
KESSLER, M.D., a resident of Maryland (collectively with successors and
registered assigns, "Holder") under the terms herein the right to purchase
Seventy-Five Thousand (75,000) of the fully paid and nonassessable shares of the
Company's authorized but unissued $0.001 par value Class A common stock at a
purchase price of One Cent ($0.01) per share, as such number of shares and price
may be adjusted in accordance herewith.

     2. NOTE. This Warrant has been issued under the terms of a Promissory Note
of the Company dated this date (the "Note"). The Holder is entitled to the
benefits of the Note and all of the exhibits thereto, and reference is made
thereto for a description of all rights and remedies thereunder.

     3. DEFINITIONS.

        (a) COMMON STOCK is defined as the $0.001 par value Class A Common
Shares of the Company.

        (b) WARRANT SHARES is defined as the shares of Common Stock issued or
issuable hereunder, referred to collectively.

     4. TERM. The right to exercise this Warrant shall expire three (3) years
after the date hereof.

     5. EXERCISE PRICE. Unless otherwise provided herein, the exercise price for
each Warrant Share purchasable hereunder shall be One Cent ($0.01).

     6. EXCHANGE OF SHARES FOR EXERCISE PRICE. The Holder at its option may
provide the Exercise Price under this Warrant by reducing the number of shares
for which the Warrant is otherwise exercisable by the number of shares having
fair market value equal to the Exercise Price. In the case where the Exercise
Price is less than the value of one (1) share, the said Exercise Price will
increase to equal the fair market value of one (1) share.

     7. HOLDER'S REDEMPTION RIGHTS. The Holder will share ratably in any
redemption of stock by the Company. If the Company shall redeem or otherwise
purchase for value any of its Common Stock prior to full exercise of this
Warrant, the Holder, at its option, may receive, at

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the time of such redemption or purchase, the same proceeds it would have been
entitled to receive if this Warrant had been exercised in full prior to such
redemption or purchase.

     8. EXERCISE PROCEDURE. This Warrant may be exercised by presenting it and
tendering the exercise price in legal tender or by bank's, cashier's or
certified check to the Company at its address, along with a written subscription
substantially in the form of EXHIBIT A hereof. The date on which this Warrant is
thus surrendered, accompanied by tender or payment as hereinbefore or
hereinafter provided, is referred to herein as the "Exercise Date". The Company
shall forthwith at its expense (including the payment of issue taxes) issue and
deliver the proper number of shares, and such shares shall be deemed issued for
all purposes as of the opening of business on the Exercise Date notwithstanding
any delay in the actual issuance.

     9. SALE OR EXCHANGE OF COMPANY OR ASSETS. If prior to issuance of stock
under this Warrant the Company sells or exchanges all or substantially all of
its assets, or all or substantially all the Common Stock of the Company is sold
or exchanged to any party other than the Holder, then the Holder at its option
may receive, in lieu of the stock otherwise issuable hereunder, such money or
property it would have been entitle to receive if this Warrant had been
exercised prior to such sale or exchange.

     10. SALE OF WARRANT OR SHARES. Neither this Warrant nor other shares of
common stock issuable upon exercise hereof have been registered under the
Securities Act of 1933, as amended, or under the securities laws of any state.
Neither this Warrant nor any shares issued pursuant to it may be sold,
transferred, pledged or hypothecated in the absence of (i) an effective
registration statement for this Warrant or the subject shares, as the case may
be, under the Securities Act of 1933, as amended, and such registration or
qualification as may be necessary under the securities laws of any state, or
(ii) an opinion of counsel reasonably satisfactory to the Company that such
registration or qualification is not required. The Company shall cause any
certificate or certificates evidencing all or any of the shares issued upon
exercise hereof prior to said registration and qualification to bear the
following legend:

          THE SHARES EVIDENCED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED
          UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR UNDER THE SECURITIES
          LAWS OF ANY STATE. THE SHARES MAY NOT BE SOLD, TRANSFERRED, PLEDGED OR
          HYPOTHECATED IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT
          UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND SUCH REGISTRATION OR
          QUALIFICATION AS MAY BE NECESSARY UNDER THE SECURITIES LAWS OF ANY
          STATE, OR AN OPINION OF COUNSEL SATISFACTORY TO THE COMPANY THAT SUCH
          REGISTRATION OR QUALIFICATION IS NOT REQUIRED.

     11. CERTAIN STOCK ACTIONS. If the Company shall subdivide its shares of
Common Stock by stock split, stock dividend or otherwise, the number of Warrant
Shares issuable upon the exercise hereof shall proportionately increase and the
Exercise Price shall proportionately decrease and, conversely, if the Company
shall combine its outstanding shares of Common Stock by stock combination,
reverse split or otherwise, the number of Warrant Shares issuable upon exercise
hereof shall proportionately decrease and the Exercise Price shall
proportionately increase.

     12. REORGANIZATION AND MERGERS. In case of any capital reorganization or
any reclassification of the capital stock of the Company or in case of the
consolidation or merger of the Company with another corporation (other than a
consolidation or merger in which the

                                       2

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ompany is the surviving corporation), or in case of any sale, transfer or other
disposition to another corporation of all or substantially all of the property,
assets, business and goodwill of the Company, the Holder of this Warrant shall
thereafter be entitled to purchase (and it shall be a condition to the
consummation of any such reorganization, reclassification, consolidation,
merger, sale, transfer or other disposition that appropriate provision shall be
made so that such Holder shall thereafter be entitled to purchase) the kind and
amount of shares of stock and other securities and property receivable in such
transaction which the Warrant entitled the Holder to purchase immediately prior
to such capital reorganization, reclassification of capital stock,
consolidation, merger, sale, transfer or other disposition, and in any such case
appropriate adjustments shall be made in the application of the provisions of
this Section 12 with respect to rights and interest thereafter of the Holder of
this Warrant to the end that the provisions of this Section 12 shall thereafter
be applicable, as near as reasonably may be, in relation to any shares or other
property thereafter purchasable upon the exercise of this Warrant.

     13. FRACTIONAL SHARES. No certificate for fractional shares shall be issued
upon the exercise of this Warrant, but in lieu thereof the Company shall
purchase any such fractional interest calculated to the nearest cent.

     14. NOTICE. Whenever the Exercise Price is adjusted as herein provided, the
Company shall forthwith deliver to the Holder a statement signed by the
President or the Treasurer of the Company stating the adjusted Exercise Price
and number of shares determined as herein specified. Such statement shall show
in detail the facts requiring such adjustment, including a statement of the
consideration received by the Company for any additional stock issued.

     15. LIQUIDATION OR DISSOLUTION. In case the Company shall, at any time
during the term of this Warrant, dissolve, liquidate or wind up its affairs, the
Holder shall be entitled, upon the exercise of this Warrant and prior to any
such distribution in dissolution or liquidation, to receive on such exercise, in
lieu of the shares of Common Stock which the Holder would have been entitled to
receive, the same kind and amount of assets as would have been distributed or
paid to the Holder upon any such dissolution, liquidation or winding up with
respect to such shares of Common Stock had the Holder been the holder of record
of such shares of Common Stock on the record date for the determination of those
holders of Common Stock entitled to receive any such liquidation distribution.

     16. TRANSFER. This Warrant shall be registered on the books of the Company
which shall be kept at its principal office for that purpose. This Warrant and
all rights hereunder are not transferable to any Person, in whole or in part,
except a member of the immediate family of the Holder or a trust for their
benefit.

     17. REPLACEMENT OF WARRANT. At the request of the Holder and on production
of evidence reasonably satisfactory to the Company of the loss, theft,
destruction or mutilation of this Warrant and (in the case of loss, theft, or
destruction) if required by the Company, upon delivery of an indemnity agreement
with surety in such reasonable amount as the Company may determine thereof, the
Company at its expense will issue in lieu thereof a new Warrant of like tenor.

     18. INVESTMENT COVENANT. The Holder by its acceptance hereof covenants that
this Warrant is, and any stock issued hereunder will be, acquired for investment
purposes, and that the Holder will not distribute the same in violation of any
state or federal law or regulation.

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     IN WITNESS WHEREOF, the Company has caused this Warrant to be signed on its
behalf by its undersigned officer, and its corporate seal to be hereunto
affixed, as of the date first above written.

SEAL:                                    AMERICAN PSYCH SYSTEMS
                                         HOLDINGS, INC.

Attest: /s/ Laura Fisher                 By: /s/ Kenneth A. Kessler
       ----------------------------          -------------------------------
                                             Name: Kenneth A. Kessler, MD
            Laura Fisher, Secretary          Title: President & CEO
       ----------------

STATE OF   Maryland           )
         ---------------------
                              )  ss:
COUNTY OF  Montgomery         )
          --------------------

         Personally appeared before me, a Notary Public in and for the
jurisdiction aforesaid, Kenneth A. Kessler, MD, made known to me as the
President & CEO of American Psych Systems Holdings, Inc., a Delaware
corporation, who acknowledged the foregoing as the true act and deed of such
corporation this 21st day of August, 2000.

                                       /s/ Joseph Magha
                                       -------------------------------------
                                       Notary Public

[Notarial Seal]

My Commission Expires: September 25, 2001
                       --------------------

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                                    EXHIBIT A

                            IRREVOCABLE SUBSCRIPTION

To:  American Psych Systems Holdings, Inc.

Ladies and Gentlemen:

The undersigned hereby elects to exercise its right under the attached Warrant
by purchasing ______________________ shares of the Class A common stock of the
Company, and hereby irrevocably subscribes to such issue. The certificates for
such shares shall be issued in the name of

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(Name)

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(Address)

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(Taxpayer Number)

and deliver to:

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(Name)

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(Address)

The exercise price of $_____________ is enclosed [OR _____________ SHARES UNDER
THE WARRANT ARE FORFEITED PURSUANT TO SECTION 6 OF THE WARRANT].

Date:
     ------------------------

Signed:                                          (Name of Holder, Please Print)
       -----------------------------------------

-------------------------------------------------------------------------------
(Address)

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(Signature)

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                                                                  EXHIBIT 4.5

THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES
ACT OF 1933, AS AMENDED, OR ANY STATE SECURITIES LAWS AND NEITHER THE SECURITIES
NOR ANY INTEREST THEREIN MAY BE OFFERED, SOLD, TRANSFERRED, PLEDGED OR OTHERWISE
DISPOSED OF EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER SUCH
ACT OR SUCH LAWS OR AN EXEMPTION FROM REGISTRATION UNDER SAID ACT OR SUCH LAWS,
WHICH, IN THE OPINION OF COUNSEL FOR THE HOLDER, WHICH COUNSEL AND OPINION ARE
REASONABLY SATISFACTORY TO COUNSEL FOR THIS CORPORATION, IS AVAILABLE.

                                                                February 1, 1996

                      WARRANT TO PURCHASE SHARES OF COMMON
                      STOCK OF AMERICAN PSYCH SYSTEMS, INC.

      This certifies that KBL Healthcare, Inc. (the "Holder"), or his
registered assigns, for value received is entitled, subject to the adjustment
and to the other terms set forth below, to purchase from AMERICAN PSYCH SYSTEMS,
INC., a Delaware corporation (the "Company"), 86,092 fully paid and
nonassessable shares of the Company's $.001 par value Common Stock (the "Stock")
at a price of $1.30 per share (the "Stock Purchase Price") at any time on or
after February 1, 1996 (the "Commencement Date") but not later than 5:00 p.m.
(New York Time) on the Expiration Date (as defined below), upon surrender to the
Company at its principal office, One Democracy Plaza, 6701 Democracy Boulevard,
Suite 555, Bethesda, Maryland 20817 Attention: President (or at such other
location as the Company may advise Holder in writing) of this Warrant properly
endorsed with the form of Subscription Agreement attached hereto duly filled in
and signed and, unless the Conversion Right set forth in Section 1.2 is
exercised, upon payment in cash or cashier's check of the aggregate Stock
Purchase Price for the number of shares for which this Warrant is being
exercised determined in accordance with the provisions hereof. The Stock
Purchase Price and, in some cases, the number of shares purchasable hereunder
are subject to adjustment as provided in Section 3 of this Warrant. This Warrant
and all rights hereunder, to the extent not exercised in the manner set forth
herein shall terminate and become null and void on the Expiration Date.
"Expiration Date" means January 31, 2000. This Warrant is issued pursuant to
Section 4(b) of the Sales Agency Agreement, dated as of October 3, 1994, as
amended, between the Company and KBL Healthcare, Inc. relating to the offering
of a minimum of 1,500,000 and a maximum of 3,000,000 shares of Stock.

      This Warrant is subject to the following terms and conditions"

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      I.    EXERCISE; ISSUANCE OF CERTIFICATES; PAYMENT FOR SHARES;
            CONVERSION RIGHT.

            1.1 DURATION OF EXERCISE OF WARRANT. This Warrant is exercisable at
the option of the Holder at any time or from time to time but not earlier than
on the Commencement Date or later than 5:00 p.m. (New York Time) on the
Expiration Date for all or a portion of the shares of Stock which may be
purchased hereunder. The Company agrees that the shares of Stock purchased under
this Warrant shall be and are deemed to be issued to Holder as the record owner
of such shares as of the close of business on the date on which this Warrant
shall have been surrendered and payment made for such shares. Subject to the
provisions of Section 2, certificates for the shares of Stock so purchased,
together with any other securities or property to which Holder is entitled upon
such exercise, shall be delivered to Holder by the Company's transfer agent at
the Company's expense within a reasonable time after the rights represented by
this Warrant have been exercised. Each stock certificate so delivered shall be
in such denominations of Stock as may be requested by Holder and shall be
registered in the name of Holder or such other name as shall be designated by
Holder, subject to the limitations contained in Section 2. If, upon exercise of
this Warrant, fewer than all of the shares of Stock evidenced by this Warrant
are purchased prior to the Expiration Date of this Warrant, one or more new
warrants substantially in the form of, and on the terms in, this Warrant will be
issued for the remaining number of shares of Stock not purchased upon exercise
of this Warrant.

            1.2 CONVERSION RIGHT. In lieu of the payment of the Stock Purchase
Price, the Holder shall have the right (but not the obligation), to require the
Company to convert this Warrant, in whole or in part, into shares of Stock (the
"Conversion Right") as provided for in this Section 1.2. Upon exercise of the
Conversion Right, the Company shall deliver to the Holder (without payment by
the Holder of any of the Stock Purchase Price) that number of shares of Stock
equal to the quotient obtained by dividing (x) the value of the Warrant at the
time the Conversion Right is exercised (determined by subtracting the aggregate
Stock Purchase Price in effect immediately prior to the exercise of the
Conversion Right from the aggregate Market Price (as hereinafter defined) for
the shares of Stock issuable upon exercise of the Warrant immediately prior to
the exercise of the Conversion Right) by (y) the Market Price of one share of
Stock immediately prior to the exercise of the Conversion Right. "Market Price"
shall mean the Stock Price (as defined below) obtained by taking the average
over a period of thirty consecutive trading days ending on the second trading
day prior to the date of determination. As used in this paragraph, the term
Stock Price shall mean (A) the mean, on each such trading day, between the high
and low sale price of a share of Stock or

                                      -2-
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if no such sale takes place on any such trading day, the mean of the closing bid
and lowest closing asked prices therefor on any such trading day, in each case
as officially reported on all national securities exchanges on which the Stock
is then listed or admitted to trading, or (B) if the Stock is not then listed or
admitted to trading on any national securities exchange, the closing price of
the Stock on such date, or (C) if no closing price is available on any such
trading day, the mean between the highest and lowest closing bid prices thereof
on any such trading date, in the over-the-counter market as reported by NASDAQ,
(D) if the Stock is not then quoted in such system, the mean between the highest
and lowest bid prices reported by the market makers and dealers for the Stock
listed as such by the National Quotation Bureau, Incorporated or any similar
successor organization, or (E) the higher of the last bona fide sale made by the
Company and the fair market value of the Stock as determined by the Board of
Directors in its good faith judgment.

            1.3 EXERCISE OF CONVERSION RIGHT. The conversion rights provided
under Section 1.2 hereof may be exercised in whole or in part and at any time
and from time to time while any Warrants remain outstanding. In order to
exercise the conversion privilege, the Holder shall surrender to the Company, at
its offices, this Warrant certificate accompanied by a duly completed Notice of
Conversion in the form attached hereto as Exhibit A. The presentation and
surrender shall be deemed a waiver of the Holder's obligation to pay all or any
portion of the aggregate purchase price payable for the shares of Stock issuable
upon exercise of this Warrant. This Warrant certificate (or so much thereof as
shall have been surrendered for conversion) shall be deemed to have been
converted immediately prior to the close of business on the day of surrender of
such Warrant certificate for conversion in accordance with the foregoing
provisions. As promptly as practicable on or after the conversion date, the
Company shall issue and shall deliver to the Holder(i) a certificate or
certificates representing the largest number of whole shares of Stock to which
the Holder shall be entitled as a result of the conversion, and (ii) if the
Warrant certificate is being converted in part only, a new certificate in
principal amount equal to the unconverted portion of the Warrant certificate. If
this Warrant is executed in whole, in lieu of any fractional shares of Stock to
which the Holder shall be entitled, the Company shall pay to the Holder cash in
accordance with the provisions of Section 12 hereof.

      2. SHARES TO BE FULLY PAID; RESERVATION OF SHARES. The Company covenants
and agrees that all shares of Stock which may be issued upon the exercise of
this Warrant (the "Warrant Shares") and all shares of common stock issuable upon
conversion of the Warrants (the "Conversion Shares") will, upon issuance, be
duly authorized, validly issued, fully paid and nonassessable and

                                      -3-
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free from all preemptive rights of any stockholder and free of all taxes, liens
and charges with respect to the issue thereof. The Company covenants that it
will reserve and keep available a sufficient number of shares of its authorized
but unissued Stock for such exercise and/or conversion, as the case may be. The
Company will take all such reasonable action as may be necessary to assure that
such shares of Stock may be issued as provided herein without violation of any
applicable law or regulation, or of any requirements of any domestic securities
exchange or automated quotation system upon which the Stock may be listed.

      3. ADJUSTMENT OF STOCK PURCHASE PRICE AND NUMBER OF SHARES. The Stock
Purchase Price and, in some cases, the number of shares purchasable upon the
exercise of this Warrant shall be subject to adjustment from time to time upon
the occurrence of certain events described in this Section 3.

            3.1 SUBDIVISION OR COMBINATION OF STOCK AND STOCK DIVIDEND. In case
the Company shall at any time subdivide its outstanding shares of Stock into a
greater number of shares or declare a dividend upon its Stock payable solely in
shares of Stock, the Stock Purchase Price in effect immediately prior to such
subdivision or declaration shall be proportionately reduced and the number of
shares issuable upon exercise of the Warrant shall be proportionately increased.
Conversely, in case the outstanding shares of Stock of the Company shall be
combined into a smaller number of shares, the Stock Purchase Price in effect
immediately prior to such combination shall be proportionately increased, and
the number of shares issuable upon exercise of the Warrant shall be
proportionately reduced.

            3.2 DILUTIVE ISSUANCES. In the event that the Company shall sell or
issue at any time after the date of this Warrant and prior to its termination
shares of Stock (other than Excluded Stock, as defined in Section 3.2.5) at a
consideration per share less than the Stock Purchase Price in effect immediately
prior to the time of such issue or sale, then, upon such sale or issuance, the
Stock Purchase Price shall be reduced to a price (calculated to the nearest
cent) determined by dividing (i) the sum of (A) the total number of shares of
Stock Outstanding (as defined below and subject to adjustment in the manner set
forth in Section 3.1) immediately prior to such issuance or sale multiplied by
the then-existing Stock Purchase Price, plus (B) the aggregate of the amount of
all consideration, if any, received by the Company upon such issuance or sale,
by (ii) the total number of shares of Stock Outstanding immediately after such
issuance or sale.

            In no event shall any such adjustment be made if it would increase
the Stock Purchase Price in effect immediately prior to such adjustment, except
as provided in Sections 3.2.3 and 3.2.4. Upon each adjustment of the Stock
Purchase Price

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pursuant to this Section 3.2, the holder of this Warrant shall thereafter be
entitled to purchase, at the Stock Purchase Price resulting from such
adjustment, the number of shares obtained by multiplying the Stock Purchase
Price in effect immediately prior to such adjustment by the number of shares
purchasable pursuant hereto immediately prior to such adjustment; and dividing
the product thereof by the Stock Purchase Price resulting from such adjustment.

                  3.2.1 DEFINITIONS.  For purposes of this Section 3.2, the
following definitions shall apply:

                        (a)   "CONVERTIBLE SECURITIES" shall mean any
indebtedness or equity securities convertible into or exchangeable for Stock.

                        (b)   "OPTIONS" shall mean any rights, warrants or
options to subscribe for or purchase Stock or Convertible Securities.

                        (c)   "STOCK OUTSTANDING" shall mean the aggregate of
all Stock of the Company outstanding and all Stock issuable upon exercise of all
outstanding Options and conversion of all outstanding Convertible Securities.

                  3.2.2 For the purposes of this Section 3.2, the following
provisions shall also be applicable:

                        3.2.2.1     CASH CONSIDERATION.  In case of the
issuance or sale of additional Stock for cash, the consideration received by the
Company therefor shall be deemed to be the amount of cash received by the
Company for such shares (or, if such shares are offered by the Company for
subscription, the subscription price, or, if such shares are sold to
underwriters or dealers for public offering without a subscription offering, the
public offering price), without deducting therefrom any compensation or discount
paid or allowed to underwriters or dealers or others performing similar services
or for any expenses incurred in connection therewith.

                        3.2.2.2     NON-CASH CONSIDERATION.  In case of the
issuance (otherwise than upon conversion or exchange of Convertible Securities)
or sale of additional Stock, Options or Convertible Securities for a
consideration other than cash or a consideration a part of which shall be other
than cash, the fair value of such consideration as determined by the Board of
Directors of the Company in the good faith exercise of its business judgment,
irrespective of the accounting treatment thereof, shall be deemed to be the
value, for purposes of this Section 3, of the consideration other than cash
received by the Company for such securities.

                                      -5-
<PAGE>

                        3.2.2.3     OPTIONS AND CONVERTIBLE SECURITIES.  In
case the Company shall in any manner issue or grant any Options or any
Convertible Securities, the total maximum number of shares of Stock issuable
upon the exercise of such Options or upon conversion or exchange of the total
maximum amount of such Convertible Securities at the time such Convertible
Securities first become convertible or exchangeable shall (as of the date of
issue or grant of such Options or, in the case of the issue or sale of
Convertible Securities other than where the same are issuable upon the exercise
of Options, as of the date of such issue or sale) be deemed to be issued and to
be outstanding for the purpose of this Section 3.2 and to have been issued for
the sum of the amount (if any) paid for such Options or Convertible Securities
and the amount (if any) payable upon the exercise of such Options or upon
conversion or exchange of such Convertible Securities at the time such
Convertible Securities first become convertible or exchangeable; provided that,
subject to the provisions of Section 3.2.3, no further adjustment of the Stock
Purchase Price shall be made upon the actual issuance of any such Stock or
Convertible Securities or upon the conversion or exchange of any such
Convertible Securities.

                  3.2.3 CHANGE IN OPTION PRICE OR CONVERSION. In the event that
the purchase price provided for in any Option referred to in subsection 3.2.2.3,
or the rate at which any Convertible Securities referred to in subsection
3.2.2.3 are convertible into or exchangeable for shares of Stock shall change at
any time (other than under or by reason of provisions designed to protect
against dilution), then, for purposes of any adjustment required by Section 3.2,
the Stock Purchase Price in effect at the time of such event shall forthwith be
readjusted to the Stock Purchase Price that would have been in effect at such
time had such Options or Convertible Securities still outstanding provided for
such changed purchase price, additional consideration or conversion rate, as the
case may be, at the time initially granted, issued or sold, provided that if
such readjustment is an crease in the Stock Purchase Price, such readjustment
shall not exceed the amount (as adjusted by Sections 3.1 and 3.2) by which the
Stock Purchase was decreased pursuant to Section 3.2 upon the issuance of the
Option or Convertible Security. No adjustment shall be made in respect of
changes in Options or Convertible Securities by reason of provisions with
respect thereto designed to protect against dilution.

                  3.2.4 TERMINATION OF OPTION OR CONVERSION RIGHTS. In the event
of the termination or expiration of any right to purchase Stock under any Option
granted after the date of this Warrant or of any right to convert or exchange
Convertible Securities issued after the date of this Warrant, the Stock Purchase
Price shall, upon such termination, be readjusted

                                      -6-
<PAGE>

to the Stock Purchase Price that would have been in effect at the time of such
expiration or termination had such Option or Convertible Security, to the extent
outstanding immediately prior to such expiration or termination, never been
issued, and the shares of Stock issuable thereunder shall no longer be deemed to
be Stock Outstanding, provided that if such readjustment is an increase in the
Stock Purchase Price, such readjustment shall not exceed the amount (as adjusted
by Sections 3.1 and 3.2) by which the Stock Purchase Price was decreased
pursuant to Section 3.2 upon the issuance of the Option or Convertible Security.
The termination or expiration of any right to purchase Stock under any Option
granted prior to the date of this Warrant or of any right to convert or exchange
Convertible Securities issued prior to the date of this Warrant shall not
trigger any adjustment to the Stock Purchase Price, but the shares of Stock
issuable under such Options or Convertible Securities shall no longer be counted
in determining the number of shares of Stock Outstanding on the date of issuance
of this Warrant for purposes of subsequent calculations under this Section 3.2.

                  3.2.5 EXCLUDED STOCK. Notwithstanding anything herein to the
contrary, the Stock Purchase Price shall not be adjusted pursuant to this
Section 3.2 by virtue of the issuance and/or sale of Excluded Stock, which shall
mean the following: (a) up to 172,628 shares issued pursuant to the Company's
Stock Option Plan or issued and/or sold to employees, advisors, directors or
officers of, or consultants to, the Company or any of its subsidiaries pursuant
to a stock grant, stock option plan, restricted stock agreement, stock purchase
plan, pension or profit-sharing plan or other stock agreement or arrangement
approved by the Company's Board of Directors, (b) the issuance, or deemed
issuance, of shares of Stock, Options and/or Convertible Securities pursuant to
the terms of any agreements, Options and Convertible Securities in effect or
outstanding immediately following the completion or termination of a private
placement of shares of the Stock of the Company through KBL Healthcare, Inc.
(the "KBL Placement"), (c) the issuance of shares of Stock, Options or
Convertible Securities as a stock dividend or deemed issuance, upon any
subdivision or combination of shares of Stock, Options or Convertible Securities
and (d) the issuance of shares of Stock, Options or Convertible Securities in
connection with the KBL Placement. For all purpose of this Section 3.2, all
shares of Excluded Stock shall be deemed to have been issued for an amount of
consideration per share equal to the initial Stock Purchase Price (subject to
adjustment in the manner set forth in Section 3.1).

            3.3 NOTICE OF ADJUSTMENT. Promptly after adjustment of the Stock
Purchase Price or any increase or decrease in the number of shares purchasable
upon the exercise of this Warrant, the Company shall give written notice
thereof, by first class

                                      -7-
<PAGE>

mail, postage prepaid, addressed to the registered holder of this Warrant at the
address of such holder as shown on the books of the Company. The notice shall be
signed by the Company's chief financial officer and shall state the effective
date of the adjustment and the Stock Purchase Price resulting from such
adjustment and the increase or decrease, if any, in the number of shares
purchasable at such price upon the exercise of this Warrant, setting forth in
reasonable detail the method of calculation and the facts upon which such
calculation is based.

            3.4   OTHER NOTICES.  If at any time:

                  (a) the Company shall declare any cash dividend upon its
Stock;

                  (b) the Company shall declare any dividend upon its Stock
payable in stock (other than a dividend payable solely in shares of Stock) or
make any special dividend or other distribution to the holders of its Stock;

                  (c) there shall be any capital reorganization, or
reclassification of the Stock of the Company, or consolidation or merger of the
Company with another corporation, or a sale of all or substantially all of the
Company's assets to another corporation; or

                  (d)   there shall be a voluntary or involuntary
dissolution, liquidation or winding-up of the Company;

then, in any one or more of said cases, the Company shall give, by first class
mail (certified or registered mail in the case of any event referred to in
paragraphs (c) or (d) above), postage prepaid, addressed to the registered
holder of this Warrant at the address of such holder as shown on the books of
the Company, (i) at least 15 days' prior written notice of the date on which the
books of the Company shall close or a record shall be taken for such dividend,
distribution or subscription rights or for determining rights to vote in respect
of any such reorganization, reclassification, consolidation, merger, sale,
dissolution, liquidation or winding-

                                      -8-
<PAGE>

up; and (ii) in the case of any such reorganization, reclassification,
consolidation, merger, sale, dissolution, liquidation or winding-up, at least 20
days' written notice of the date when the same shall take place. Any notice
given in accordance with clause (i) above shall also specify, in the case of any
such dividend, distribution or subscription rights, the date on which the
holders of Stock shall be entitled thereto. Any notice given in accordance with
clause (ii) above shall also specify the date on which the holders of Stock
shall be entitled to exchange their Stock for securities or other property
deliverable upon such reorganization, reclassification, consolidation, merger,
sale, dissolution, liquidation or winding-up, as the case may be. If the Holder
of the Warrant does not exercise this Warrant prior to the occurrence of an
event described above, except as provided in Sections 3.1 and 3.5, the Holder
shall not be entitled to receive the benefits accruing to existing holders of
the Stock in such event.

            3.5 CHANGES IN STOCK. In case at any time following the date hereof,
the Company shall be a party to any transaction (including, without limitation,
a merger, consolidation, sale of all or substantially all of the Company's
assets or recapitalization of the Stock) in which the previously outstanding
Stock shall be changed into or exchanged for different securities of the Company
or common stock or other securities of another corporation or interests in a
noncorporate entity or other property (including cash) or any combination of any
of the foregoing (each such transaction being herein called the "Transaction"
and the date of consummation of the Transaction being herein called the
"Consummation Date"), then, as a condition of the consummation of the
Transaction, lawful and adequate provisions shall be made so that each Holder,
upon the exercise hereof at any time on or after the Consummation Date, shall be
entitled to receive; and this Warrant shall thereafter represent the right to
receive, in lieu of the Stock issuable upon such exercise prior to the
Consummation Date, the highest amount of securities or other property to which
such Holder would actually have been entitled as a stockholder upon the
consummation of the Transaction if such Holder had exercised such Warrant
immediately prior thereto. The provisions of this Section 3.5 shall similarly
apply to successive Transactions.

      4. ISSUE TAX. The issuance of certificates for shares of Stock upon the
exercise of the Warrant shall be made without charge to the holder of the
Warrant for any issue tax in respect thereof; 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 issuance and delivery of any certificate in a name
other than that of the then holder of the Warrant being exercised.

      5. NO VOTING OR DIVIDEND RIGHTS; LIMITATION OF LIABILITY. Nothing
contained in this Warrant shall be construed as conferring upon the holder
hereof the right to vote or to consent or to receive notice as a stockholder in
respect of meetings of stockholders for the election of directors of the Company
or any other matters or any rights whatsoever as a stockholder of the Company.
Except for the adjustment to the Stock Purchase Price pursuant to Section 3.1 in
the event of a dividend on the Stock payable in shares of Stock, no dividends or
interest shall be payable or accrued in respect of this Warrant or the interest
represented hereby or the shares purchasable hereunder until, and only to the
extent that, this Warrant shall have been exercised.

                                      -9-
<PAGE>

No provisions hereof, in the absence of affirmative action by the holder to
purchase shares of Stock, and no mere enumeration herein of the rights or
privileges of the holder hereof, shall give rise to any liability of such holder
for the Stock Purchase Price or as a stockholder of the Company whether such
liability is asserted by the Company or by its creditors.

      6.    RESTRICTIONS ON TRANSFERABILITY OF SECURITIES; COMPLIANCE WITH
            SECURITIES ACT.

            6.1 RESTRICTIONS ON TRANSFERABILITY. This Warrant and the Warrant
Shares and the Conversion Shares (collectively, the "Securities"), shall not be
transferable in the absence of Registration under the Act (as defined below) or
an exemption therefrom under said Act.

            6.2 RESTRICTIVE LEGEND. Each certificate representing the Securities
or any other securities issued in respect of the Securities upon any stock
split, stock dividend, recapitalization, merger, consolidation or similar event,
shall be stamped or otherwise imprinted with a legend substantially in the
following form (in addition to any legend required under applicable state
securities laws):

            THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE
            SECURITIES ACT OF 1933, AS AMENDED, OR ANY STATE SECURITIES LAWS AND
            NEITHER THE SECURITIES NOR ANY INTEREST THEREIN MAY BE OFFERED,
            SOLD, TRANSFERRED, PLEDGED OR OTHERWISE DISPOSED OF EXCEPT PURSUANT
            TO AN EFFECTIVE REGISTRATION STATEMENT UNDER SUCH ACT OR SUCH LAWS
            OR AN EXEMPTION FROM REGISTRATION UNDER SAID ACT OR SUCH LAWS,
            WHICH, IN THE OPINION OF COUNSEL FOR THE HOLDER, WHICH COUNSEL AND
            OPINION ARE REASONABLY SATISFACTORY TO COUNSEL FOR THIS CORPORATION,
            IS AVAILABLE.

      7.    REGISTRATION RIGHTS.  The Warrant Shares and the Conversion
Shares are entitled to certain registration rights pursuant to that certain
Registration Rights Agreement made on behalf of the Holder and its designees
by the Company.

      8.    MODIFICATION AND WAIVER.  This Warrant and any provision hereof
may be changed, waived, discharged or terminated only by an instrument in
writing signed by the party against which enforcement of the same is sought.

      9.    NOTICES. Any notice, request or other document required or permitted
to be given or delivered to the holder hereof or the Company shall, except as
otherwise provided in this Warrant, be delivered or shall be sent by certified
or registered mail, postage prepaid, to each such holder at its address as

                                      -10-
<PAGE>

shown on the books of the Company.

      10.   DESCRIPTIVE HEADINGS AND GOVERNING LAW. The descriptive headings of
several sections and paragraphs of this Warrant are inserted for convenience
only and do not constitute a part of this Warrant. This Warrant shall be
construed and enforced in accordance with, and the rights of the parties shall
be governed by, the laws of the State of New York.

      11.   LOST WARRANTS OR STOCK CERTIFICATES. The Company represents and
warrants to Holder that upon receipt of evidence reasonably satisfactory to the
Company of the loss, theft, destruction or mutilation of any Warrant or stock
certificate and, in the case of any such loss, theft or destruction, upon
receipt of an indemnity and, if requested, bond reasonably satisfactory to the
Company, or in the case of any such mutilation, upon surrender and cancellation
of such Warrant or stock certificate, the Company at its expense will make and
deliver a new Warrant or stock certificate, of like tenor, in lieu of the lost,
stolen, destroyed or mutilated Warrant or stock certificate.

      12.   FRACTIONAL SHARES. No fractional shares shall be issued upon
exercise of this Warrant. The Company shall, in lieu of issuing any fractional
share pay the holder entitled to such fraction a sum in cash equal to the fair
market value of any such fractional interest as it shall appear on the public
market, or if there is no public market for such shares, then as shall be
reasonably determined by the Company.

      IN WITNESS WHEREOF, the Company has caused this Warrant to be executed by
its officer, thereunto duly authorized as of this 1st day of February, 1996.

                                    AMERICAN PSYCH SYSTEMS, INC.

                                    By:   /s/ Kenneth A. Kessler
                                          --------------------------
                                          Kenneth Kessler, M.D.
                                          President

                                      -11-

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