Document:

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                                                                  Exhibit 10.14

                         FORM OF TAX SHARING AGREEMENT

          TAX SHARING AGREEMENT (the "Agreement") dated as of ___________, 1999
                                      ---------
by and among SNYDER COMMUNICATIONS, INC., a Delaware corporation ("Snyder"), and
                                                                   ------
VENTIV HEALTH, INC., a Delaware corporation and a wholly owned subsidiary of
Snyder ("Ventiv").
         ------

                         W I T N E S S E T H
                         -------------------

          WHEREAS Snyder and its subsidiaries are currently members of the
Snyder Consolidated Group (as defined herein);

          WHEREAS the Board of Directors of Snyder has determined that the
interests of Snyder's businesses would be best served by distributing to Snyder
shareholders, Ventiv's healthcare businesses;

          WHEREAS Snyder will undertake a restructuring (the "Restructuring")
following which Snyder will distribute all the shares of Ventiv common stock
held by Snyder, on a pro rata basis, to the holders of the common stock of
Snyder (the "Distribution");

          WHEREAS, the parties intend that for federal income tax purposes
certain aspects of the Restructuring and the Distribution shall qualify as tax-
free transactions pursuant to Sections 332, 351, 355 and 368 of the Code (as
defined herein);

          WHEREAS, the parties wish (i) to provide for the payment of tax
liabilities and entitlement to refunds thereof, allocate responsibility for, and
cooperation in, the filing of Tax Returns and provide for certain other matters
relating to Taxes (as defined herein) and (ii) to set forth certain
representations, warranties, covenants and indemnities relating to the
preservation of the tax-free status of the Restructuring and the Distribution.

          NOW, THEREFORE, in consideration of the mutual promises and
undertakings contained herein, the parties agree as follows:

    1.  Definitions.
        ------------
        (a)  General.  For purposes of this Agreement, the following terms
             -------
shall have the meanings set forth below:

                (i)  "Agreement" shall have the meaning set forth in the
                      ---------
preamble to this Agreement.

                (ii) "Code" shall mean the Internal Revenue Code of 1986, as
                      ----
amended.
<PAGE>

                (iii)  "Combined Return" shall mean a consolidated, combined
                        ---------------
or unitary income Tax Return that includes one or more members of the Snyder
Subgroup and one or more members of the Ventiv Subgroup.

                (iv) "Distribution" shall have the meaning set forth in the
                      ------------
recitals to this Agreement.

                (v)  "Distribution Date" shall mean the date on which the
                      -----------------
Distribution occurs.

                (vi) "Indemnified Party" shall mean any Person which is
                      -----------------
seeking indemnification from an Indemnifying Party pursuant to the provisions of
this Agreement.

                (vii)  "Indemnifying Party" shall mean any Person from which
                        ------------------
Distribution occurs. Party is seeking indemnification pursuant to the provisions
of this Agreement.

                (viii)  "Independent Accounting Firm" shall mean a nationally
                         ---------------------------
recognized independent accounting firm, jointly selected by Snyder and Ventiv.

                (ix) "Overpayment Rate" shall mean the annual rate of interest
                      ----------------
specified in Section 6621(a)(1) of the Code (or similar provision of state,
local or foreign tax law, as applicable) for overpayments of Tax.

                (x)  "Person" shall mean and includes any individual,
                      ------
partnership, joint venture, limited liability company, corporation, association,
joint stock company, trust, unincorporated organization or similar entity.

                (xi) "Post-Distribution Taxable Period" shall mean a taxable
                      --------------------------------
period that begins after the Distribution Date.

                (xii)  "Pre-Distribution Taxable Period" shall mean a taxable
                        -------------------------------
period that ends on or before the Distribution Date.

                (xiii)  "Present Value Benefit" shall mean the present value
                         ---------------------
(based on a discount rate equal to the short-term applicable federal rate as
determined under Section 1274(d) of the Code at the time of determination, and
assuming that the Indemnified Party will be liable for Taxes at all relevant
times at the maximum marginal rates) of any income tax benefit.

                (xiv)  "Proceeding" shall mean any audit or other examination,
                        ----------
or any judicial or administrative proceeding, relating to liability for or
refunds or adjustments with respect to Taxes.

                (xv) "Refund" shall mean any refund of Taxes, including any
                      ------
reduction in liability for such Taxes by means of a credit, offset or otherwise.
<PAGE>

                (xvi)  "Restructuring" shall have the meaning set forth in the
                        -------------
recitals to this Agreement.

                (xvii)  "Snyder" shall have the meaning set forth in the
                         ------
preamble to this Agreement.

                (xviii)  "Snyder Consolidated Group" shall mean the affiliated
                          -------------------------
group of corporations, within the meaning of Section 1504(a) of the Code, of
which Snyder is the common parent, and any member of such group.

                (xix)  "Snyder Business" shall mean all businesses, operations,
                        ---------------
assets, and liabilities of any member of the Snyder Consolidated Group other
than those businesses, operations, assets and liabilities that comprise the
Ventiv Business.

                (xx) "Snyder Business Tax Liabilities" shall mean all Tax
                      -------------------------------
Liabilities other than Ventiv Business Tax Liabilities.

                (xxi)  "Snyder Subgroup" shall mean each member of the Snyder
                        ---------------
Consolidated Group other than any member of the Ventiv Subgroup.

                (xxii)   "Straddle Period" shall mean a taxable period that
                          ---------------
includes, but does not end on, the Distribution Date.

                (xxiii)  "Tax" or "Taxes" shall mean all taxes, charges, fees,
                          ---      -----
imposts, levies or other assessments, including, without limitation, all net
income, gross receipts, capital, sales, use, gains, ad valorem, value added,
transfer, franchise, profits, inventory, capital stock, license, withholding,
payroll, employment, social security, unemployment, excise, severance, stamp,
occupation, property and estimated taxes, customs duties, fees, assessments and
charges of any kind whatsoever, together with any interest and any penalties,
fines, additions to tax or additional amounts imposed by any taxing authority
(domestic or foreign) and shall include any transferee liability in respect of
Taxes.

                (xxiv)  "Tax Liabilities" shall mean all liabilities for Taxes.
                         ---------------

                (xxv)  "Tax Returns" shall mean all reports, returns,
                        -----------
declarations, forms and statements filed or required to be filed with respect to
Taxes, including attachments thereto and amendments thereof.

                (xxvi)  "Transaction Related Proceeding" shall mean a
                         ------------------------------
Proceeding, to the extent it relates to the qualification of the Restructuring
and the Distribution as tax-free transactions pursuant to Sections 332, 351, 355
and 368 of the Code.

                (xxvii)  "Transaction Tax Returns" shall mean all Tax Returns
                          -----------------------
filed or required to be filed with respect to Transaction Taxes.

                (xxviii)  "Transaction Taxes" shall mean all sales, use,
                           -----------------
license, transfer, stamp, and other similar taxes or fees (including, without
limitation, all real
<PAGE>

estate, patent, copyright, and trademark transfer taxes and recording fees)
incurred in connection with the Restructuring or Distribution.

                (xxix)  "Ventiv" shall have the meaning set forth in the
                         ------
preamble to this Agreement.

                (xxx)  "Ventiv Business" shall mean all businesses, operations,
                        ---------------
assets and liabilities of any member of the Snyder Consolidated Group that
comprise the pharmaceutical and life sciences businesses.

                (xxxi)  "Ventiv Business Tax Liabilities" shall mean all Tax
                         -------------------------------
Liabilities arising out of or attributable to the Ventiv Business, including,
without limitation, Tax Liabilities arising out of the acquisition of any Ventiv
Business.

                (xxxii)  "Ventiv Subgroup" shall mean Ventiv and its present
                          ---------------
and future direct and indirect subsidiaries.

        (b)  Other Definitional Provisions.

                (i)  The words "hereof", "herein", and "hereunder" and words
of similar import, when used in this Agreement, shall refer to this Agreement as
a whole and not to any particular provision of this Agreement.

                (ii) The terms defined in the singular shall have a comparable
meaning when used in the plural, and vice versa.

    2.  Certain Operating Conventions.
        ------------------------------

        (a)  Termination of Taxable Years.  For federal income tax purposes,
             ----------------------------
the taxable year of each member of the Ventiv Subgroup shall end as of the close
of the Distribution Date. Snyder and Ventiv shall, unless prohibited by
applicable law, take all action necessary or appropriate to close the taxable
period of each member of the Ventiv Subgroup for all Tax purposes as of the
close of the Distribution Date.

    3.  Filing of Tax Returns; Payment of Taxes.
        ----------------------------------------

        (a)  Tax Returns Required to Be Filed Prior to Distribution Date.
             -----------------------------------------------------------
Snyder shall file or cause to be filed all Tax Returns of Snyder and any member
of the Snyder Consolidated Group required to be filed (after giving effect to
any valid extension of time in which to make such filings) prior to the
Distribution Date and shall pay or cause to be paid all Tax Liabilities due with
respect to such Tax Returns.

        (b)  Tax Returns for Pre-Distribution Taxable Periods and Straddle
             -------------------------------------------------------------
Periods.  Snyder shall prepare or cause to be prepared, for Pre-Distribution
-------
Taxable Periods and Straddle Periods, all (1) Combined Returns and (2) Tax
Returns required to be filed on a separate return basis by any member of the
Snyder Consolidated Group, in each case, which Tax Returns are not required to
be (after giving effect to any valid extensions), and are not, filed on or prior
to the Distribution Date. Snyder shall pay or
<PAGE>

cause to be paid all Snyder Business Tax Liabilities due with respect to Tax
Returns described in (1) and (2), and Ventiv shall pay or cause to be paid all
Ventiv Business Tax Liabilities due with respect to such Tax Returns. Snyder
shall provide Ventiv with a copy of any such Tax Returns which reflect Ventiv
Business Tax Liabilities at least twenty (20) days prior to the due date for
filing such Tax Returns. Ventiv shall have the right to review any such Tax
Returns and Ventiv and Snyder shall attempt in good faith mutually to resolve
any disagreements regarding such Tax Returns. With respect to any Tax Returns
described in (2) relating to a member of the Ventiv Subgroup, Snyder shall
timely file such Tax Returns with the appropriate Tax authority pursuant to a
power of attorney executed and delivered to Snyder by Ventiv pursuant to Section
9(d) hereof.

        (c)  Tax Returns for Post-Distribution Taxable Periods.  Ventiv shall be
             -------------------------------------------------
responsible for (1) preparing and filing or causing to be prepared and filed all
Tax Returns required to be filed by any member of the Ventiv Subgroup for any
Post-Distribution Taxable Period and (2) paying or causing to be paid any Tax
Liability due with respect to such Tax Returns. Snyder shall be responsible for
(1) preparing and filing or causing to be prepared and filed all Tax Returns
required to be filed by any member of the Snyder Subgroup for any Post-
Distribution Taxable Period and (2) paying or causing to be paid any Tax
Liability due with respect to such Tax Returns.

        (d)  Transaction Taxes.  Each of Snyder and Ventiv shall be
             -----------------
responsible for preparing and filing or causing to be prepared and filed all
Transaction Tax Returns required to be filed by it and each of Snyder and Ventiv
shall pay or cause to be paid all Transaction Taxes required to be paid by it.

    4.  Indemnification for Taxes.
        --------------------------
        (a)  Indemnification by Ventiv.  Ventiv shall pay, and shall indemnify
             -------------------------
and hold each member of the Snyder Subgroup and their respective shareholders,
directors, officers, employees, affiliates, agents and successors harmless from
and against, without duplication, (1) all Ventiv Business Tax Liabilities, (2)
all Tax Liabilities which Ventiv is required to pay under Section 3 hereof, (3)
all Tax Liabilities incurred by any member of the Snyder Subgroup by reason of
the breach by Ventiv of any of its covenants hereunder, and (4) any costs and
expenses related to the foregoing (including, without limitation, reasonable
attorneys' fees and expenses). Any payments made pursuant to this Section 4(a)
shall be on an after-Tax basis.

        (b)  Liability of Ventiv Subgroup for Undertaking Certain Transactions.
             -----------------------------------------------------------------
Notwithstanding any other provision of this Agreement to the contrary, if, as a
result of any event, action, or failure to act wholly or partially within the
control of any member of the Ventiv Subgroup including, without limitation, any
event, action or failure to act that results in a breach of any representation
or covenant or in the inaccuracy of any statement set forth in Exhibit A hereto,
or any other event related to the acquisition of Ventiv stock any Taxes are
imposed on any member of the Snyder Subgroup with respect to any action taken
pursuant to the Restructuring or the Distribution and the transactions related
to the Restructuring or the Distribution, including without limitation, the
transactions that were intended to be tax-free under
<PAGE>

Sections 332, 351, 355 and 368 of the Code, then Ventiv shall indemnify and hold
harmless each member of the Snyder Subgroup with respect to any such Taxes on an
after-tax basis.

        (c)  Indemnification by Snyder.  Snyder shall pay, and shall indemnify
             -------------------------
and hold each member of the Ventiv Subgroup and their respective shareholders,
directors, officers, employees, affiliates, agents and successors harmless from
and against, without duplication, (1) all Snyder Business Tax Liabilities, (2)
all Tax Liabilities which Snyder is required to pay under Section 3 hereof, (3)
all Tax Liabilities incurred by any member of the Ventiv Subgroup by reason of
the breach by Snyder of any of its covenants hereunder, (4) except as set forth
in Section 4(b) hereof, all Tax Liabilities imposed on any member of the Ventiv
Subgroup as a result of any of the transactions related to the Restructuring or
the Distribution being determined to be taxable transactions and (5) any costs
and expenses related to the foregoing (including, without limitation, reasonable
attorneys' fees and expenses). Any payments made pursuant to this Section 4(c)
shall be on an after-Tax basis.

        (d)  Payment.  If the Indemnifying Party is required to indemnify the
             -------
Indemnified Party pursuant to this Section 4, the Indemnified Party shall submit
its calculations of the amount required to be paid pursuant to this Section 4
(which shall be net of the Present Value Benefit realized or realizable by the
Indemnified Party), showing such calculations in sufficient detail so as to
permit the Indemnifying Party to understand the calculations. Subject to the
following sentence, the Indemnifying Party shall pay to the Indemnified Party,
no later than 10 days after the Indemnifying Party receives the Indemnified
Party's calculations, the amount that the Indemnifying Party is required to pay
the Indemnified Party under this Section 4. If the Indemnifying Party disagrees
with such calculations, it must notify the Indemnified Party of its disagreement
in writing within 10 days of receiving such calculations. Any dispute regarding
such calculations shall be resolved in accordance with Section 8 of this
Agreement.

        (e)  Time Limits.  Any claim under this Section 4 with respect to a Tax
             -----------
Liability must be made no later than 30 days after the expiration of the
applicable statute of limitations for assessment of such Tax Liability.

        (f)  No Duplication.  No payments pursuant to this Section 4 shall be
             --------------
duplicative of any payments under the Distribution Agreement entered into as of
the date hereof or vice versa. To the extent that, without regard to this
                   ---- -----
sentence, any Person has a right to be indemnified under both this Agreement and
such other agreement with respect to any Tax Liability, such Person's
indemnification right with respect to such Tax Liability shall be governed
exclusively by this Agreement.

        5.  Carrybacks and Carryovers.  In the event that any member of the
            -------------------------
Ventiv Subgroup realizes any loss, credit or other Tax attribute in any Post-
Distribution Taxable Period, such member may elect to carry back such loss,
credit or Tax attribute to a prior Snyder Consolidated Group taxable year.
Snyder shall cooperate with Ventiv in seeking from the appropriate taxing
authority any Refund that reasonably would result from such carryback. Ventiv
shall be entitled to any Refund (or other Tax benefit)
<PAGE>

realized by a member of the Snyder Subgroup (including any interest thereon
received from such taxing authority) attributable to such carryback, within 10
days after such Refund (or other benefit) is received; provided, however, that
                                                       --------  -------
Snyder shall be entitled to Refunds that result from the carryback of a loss,
credit or other Tax attribute by a member of the Snyder Subgroup from a Post-
Distribution Taxable Period to a Pre-Distribution Taxable Period. Except as
otherwise provided by applicable law, if a member of the Ventiv Subgroup and a
member of the Snyder Subgroup both may carry back a loss or other Tax attribute
to the same Snyder Consolidated Group taxable year, any Refund (or other Tax
benefit) resulting therefrom shall be allocated between Ventiv and Snyder
proportionately based on the relative amounts of the Refunds (or other Tax
benefits) to which the Ventiv Subgroup and the Snyder Subgroup, respectively,
would have been entitled had its carrybacks been the only carrybacks to such
taxable year. Similarly, Ventiv shall be entitled to the benefit, in Post-
Distribution Taxable Periods, of any net operating loss, capital loss, unused
investment or foreign tax credit or other Tax attribute arising in a Pre-
Distribution Taxable Period (including with respect to an affiliated group of
which Ventiv was a member) and properly apportioned to a member of the Ventiv
Subgroup in accordance with Treasury Regulation Sections 1.1502-21 and 1.1502-22
or other applicable law.

    6.  Refunds of Taxes.  Except as provided in Section 5 above, Ventiv shall
        ----------------
be entitled to all Refunds relating to Taxes (plus any interest thereon received
with respect thereto from the applicable taxing authority) for which Ventiv is
or may be liable pursuant to the provisions of Sections 3 and 4 of this
Agreement, and Snyder shall be entitled to all Refunds relating to Taxes (plus
any interest thereon received with respect thereto from the applicable taxing
authority) for which Snyder is or may be liable pursuant to the provisions of
Sections 3 and 4 of this Agreement.  A party receiving a Refund to which another
party is entitled pursuant to this Agreement shall pay the amount to which such
other party is entitled within 10 days after the receipt of the Refund (plus any
interest thereon received with respect thereto from the applicable taxing
authority less any Taxes payable with respect to such Refund or credit).

    7.  Cooperation; Maintenance and Retention of Records.  Snyder and Ventiv
        -------------------------------------------------
shall, and shall cause the members of the Snyder Subgroup and the Ventiv
Subgroup, respectively, to provide the requesting party with such assistance and
documents as may be reasonably requested by such party in connection with (i)
the preparation of any Tax Return, (ii) the conduct of any Proceeding, (iii) any
matter relating to Taxes of any member of the Snyder Consolidated Group, the
Snyder Subgroup or the Ventiv Subgroup and (iv) any other matter that is a
subject of this Agreement, and the requesting party shall pay any reasonable
out-of-pocket expenses incurred in connection therewith. Snyder and Ventiv shall
retain or cause to be retained all Tax Returns, schedules and workpapers, and
all material records or other documents relating thereto, until the expiration
of the statute of limitations (including any waivers or extensions thereof) of
the taxable years to which such Tax Returns and other documents relate or until
the expiration of any additional period that any party reasonably requests, in
writing, with respect to specific material records or documents. A party
intending to destroy any material records or documents shall provide the other
party with reasonable advance notice and the opportunity to copy or take
possession of such records and
<PAGE>

documents. The parties hereto will notify each other in writing of any waivers
or extensions of the applicable statute of limitations that may affect the
period for which the foregoing records or other documents must be retained.

    8.  Disputes.  If the parties disagree as to the amount of any payment to be
        --------
made under, or any other matter arising out of, this Agreement, the parties
shall attempt in good faith to resolve such dispute, and any agreed upon amount
shall be paid to the appropriate party.  If such dispute is not resolved within
15 days or such other time period as may be set forth in this Agreement, the
parties shall jointly retain the Independent Accounting Firm to resolve the
dispute.  The fees of the Independent Accounting Firm shall be borne equally by
Ventiv and Snyder, and the decision of such Independent Accounting Firm shall be
final and binding on all parties.  Following the decision of the Independent
Accounting Firm, the parties shall each take or cause to be taken any action
that is necessary or appropriate to implement such decision of the Independent
Accounting Firm, including, without limitation, the prompt payment of
underpayments or overpayments, with interest calculated on such overpayments and
underpayments at the Overpayment Rate from the date such payment was due through
the date such underpayment or overpayment is paid or refunded.

    9.  Proceedings.
        ------------
        (a)  Notification.
             -------------
                (i)  Snyder shall, promptly upon receipt of notice thereof by
any member of the Snyder Subgroup, notify Ventiv in writing of any communication
with respect to any pending or threatened Proceeding in connection with a Tax
Liability (or an issue related thereto) for which Ventiv may be responsible
pursuant to this Agreement. Snyder shall include with such notification a true,
correct and complete copy of any written communication, and an accurate and
complete written summary of any oral communication, so received by a member of
the Snyder Subgroup. The failure of Snyder timely to forward such notification
in accordance with the immediately preceding sentence shall not relieve Ventiv
of its obligation to pay such Tax Liability or indemnify Snyder therefor, except
to the extent that the failure timely to forward such notification prejudices
the ability of Ventiv to contest such Tax Liability or increases the amount of
such Tax Liability.

                (ii) Ventiv shall, promptly upon receipt of notice thereof by
any member of the Ventiv Subgroup, notify Snyder in writing of any communication
with respect to any pending or threatened Proceeding in connection with a Tax
Liability (or an issue related thereto) for which Snyder may be responsible
pursuant to this Agreement. Ventiv shall include with such notification a true,
correct and complete copy of any written communication, and an accurate and
complete written summary of any oral communication, so received by a member of
the Ventiv Subgroup. The failure of Ventiv timely to forward such notification
in accordance with the immediately preceding sentence shall not relieve Snyder
of its obligation to pay such Tax Liability or indemnify Ventiv therefor, except
to the extent that the failure timely to forward such notification
<PAGE>

prejudices the ability of Snyder to contest such Tax Liability or increases the
amount of such Tax Liability.

        (b) Pre-Distribution Taxable Periods, Post-Distribution Taxable
            -----------------------------------------------------------
Periods and Straddle Periods.  Snyder (or such member of the Snyder Subgroup
----------------------------
as Snyder shall designate) shall have the sole right to represent its interests
in any Proceeding relating to Snyder Business Tax Liabilities and to employ
counsel of its choice at its expense. Ventiv (or such member of the Ventiv
Subgroup as Ventiv shall designate) shall have the sole right to represent its
interests in any Proceeding relating to Ventiv Business Tax Liabilities and to
employ counsel of its choice at its expense. Snyder and Ventiv shall jointly
represent their respective interests in any Proceeding relating to both Snyder
Business Tax Liabilities and Ventiv Business Tax Liabilities.

        (c)  Transaction-Related Proceedings.  Snyder and Ventiv shall jointly
             -------------------------------
represent the interests of the Snyder Consolidated Group, the Ventiv Subgroup
and the Snyder Subgroup in any Proceeding relating to Transaction Taxes, or any
Transaction-Related Proceeding for which Ventiv has acknowledged its obligation
to indemnify Snyder pursuant to Section 4(b) hereof. Except as set forth in the
preceding sentence, Snyder shall have the sole right to represent the interests
of the Snyder Consolidated Group, the Ventiv Subgroup and the Snyder Subgroup in
any Transaction-Related Proceeding and to employ counsel of its choice at its
expense.

        (d)  Power of Attorney.  Each member of the Ventiv Subgroup shall
             -----------------
execute and deliver to Snyder (or such member of the Snyder Subgroup as Snyder
shall designate) any power of attorney or other document reasonably requested by
Snyder (or such designee) in connection with the filing of Tax Returns as
described in Section 3(b) hereof or the representation by Snyder of the
interests of the Ventiv Subgroup in any Transaction-Related Proceeding as
described in Section 9(c) hereof.

    10.  Payments.
         ---------
        (a)  Interest; Method of Payment.  Any payment required by this
             ---------------------------
Agreement that is not made on or before the date provided hereunder shall bear
interest after such date at the Overpayment Rate. All payments made pursuant to
this Agreement shall be made in immediately available funds.

        (b)  Characterization of Payments.  For all Tax purposes, the parties
             ----------------------------
hereto agree to treat, and to cause their respective affiliates to treat, (1)
any payment required by this Agreement as either a contribution by Snyder to
Ventiv or a distribution by Ventiv to Snyder, as the case may be, occurring
immediately prior to the Distribution and (2) any payment of interest or non-
federal Taxes by or to a taxing authority as taxable or deductible, as the case
may be, to the party entitled under this Agreement to retain such payment or
required under this Agreement to make such payment, in either case except as
otherwise mandated by applicable law.

    11.  Certain Covenants.
         -----------------
<PAGE>

        (a)  Snyder and the Snyder Subgroup.
             ------------------------------

                (i)  Snyder shall comply and shall cause each member of the
Snyder Subgroup to comply with and otherwise not take action inconsistent with
each representation, statement and covenant set forth on Exhibit A hereto; and

                (ii) until two years after the Distribution Date, Snyder will
remain in the active conduct of a trade or business, as defined in Section
355(b) of the Code.

    (b)  Ventiv and the Ventiv Subgroup.
         ------------------------------

                (i)  Ventiv shall comply and shall cause each member of the
Ventiv Subgroup to comply with and otherwise not take action inconsistent with
each representation, statement and covenant set forth on Exhibit A hereto; and

                (ii) until two years after the Distribution Date, Ventiv will
remain in the active conduct of a trade or business, as defined in Section
355(b) of the Code.

    12.  Termination of Prior Tax Sharing Agreements.  This Agreement shall take
         -------------------------------------------
effect on the Distribution Date and shall replace all other agreements, whether
or not written, in respect of any Taxes between or among any members of the
Snyder Subgroup on the one hand and the Ventiv Subgroup on the other.  All such
replaced agreements shall be cancelled as of the Distribution Date to the extent
they relate to any members of the Ventiv Subgroup, and any rights or obligations
of any members of the Snyder Subgroup or the Ventiv Subgroup existing thereunder
thereby shall be fully and finally settled without any payment by any party
thereto.

    13.  Amendment.  This Agreement may be amended, modified or supplemented
         ---------
only by a written agreement signed by all of the parties hereto.

    14.  Governing Law.  This Agreement shall be governed by, and construed in
         -------------
accordance with, the laws of the State of New York, without reference to choice
of law principles, including matters of construction, validity and performance.

    15.  Notices.  Notices, requests, permissions, waivers, and other
         -------
communications hereunder shall be in writing and shall be deemed to have been
duly given if signed by the respective persons giving them (in the case of any
corporation the signature shall be by an officer thereof) and delivered by hand
or by telecopy or on the date of receipt indicated on the return receipt if
mailed (registered or certified, return receipt requested, properly addressed
and postage prepaid):

          If to Snyder, to:

          Snyder Communications, Inc.
          Two Democracy Center
          6903 Rockledge Drive, 15th floor
<PAGE>

          Bethesda, Maryland 20817
          Attention:  Chief Executive Officer

          If to Ventiv, to:

          Ventiv Health, Inc.
          200 Cottontail Lane
          Vantage Court North
          Somerset, New Jersey 08873
          Attention:  Chief Executive Officer

or to such other address as either party hereto may have furnished to the other
party by a notice in writing in accordance with this Section 15.  Copies of all
notices, requests, claims, demands and other communications hereunder shall also
be given to:

          Weil, Gotshal & Manges LLP
          767 Fifth Avenue
          New York, New York 10153
          Attention: Norman D. Chirite, Esq.

    16.  Entire Agreement.  This Agreement contains the entire understanding
         ----------------
of the parties hereto with respect to the subject matter contained herein, and
supersedes and cancels all prior agreements, negotiations, correspondence,
undertakings and communications of the parties, oral or written, respecting such
subject matter.

    17.  Headings; References.  The article, section and paragraph headings
         --------------------
contained in this Agreement are for reference purposes only and shall not affect
in any way the meaning or interpretation of this Agreement.  All references
herein to "Sections" shall be deemed to be references to Sections hereof unless
otherwise indicated.

    18.  Counterparts.  This Agreement may be executed in one or more
         ------------
counterparts and each counterpart shall be deemed to be an original, but all of
which shall constitute one and the same original.

    19.  Parties in Interest; Assignment; Successor.  Neither this Agreement
         ------------------------------------------
nor any of the rights, interest or obligations hereunder shall be assigned by
either of the parties hereto without the prior written consent of the other
party. Subject to the preceding sentence, this Agreement shall inure to the
benefit of and be binding upon the parties hereto and their respective
successors and permitted assigns. Nothing in this Agreement, express or implied,
is intended to confer upon any other Person, other than members of the Ventiv
Subgroup and the Snyder Subgroup, any rights or remedies under or by reason of
this Agreement.

    20.  Severability; Enforcement.  The invalidity of any portion hereof shall
         -------------------------
not affect the validity, force or effect of the remaining portions hereof. If it
is ever held that any restriction hereunder is too broad to permit enforcement
of such restriction to its
<PAGE>

fullest extent, each party agrees that a court of competent jurisdiction may
enforce such restriction to the maximum extent permitted by law, and each party
hereby consents and agrees that such scope may be judicially modified
accordingly in any proceeding brought to enforce such restriction.

    21.  Effective Date.  This Agreement shall become effective only upon the
         --------------
occurrence of the Distribution Date.

          IN WITNESS WHEREOF, each of the parties has caused this Tax Sharing
Agreement to be executed on its behalf by its officers thereunto duly
authorized, all as of the day and year first written above.

                                    SNYDER COMMUNICATIONS, INC.

                                    By:______________________________
                                       Name:
                                       Title:

                                    VENTIV HEALTH, INC.

                                    By:______________________________
                                       Name:
                                       Title:<PAGE>

                                                                   Exhibit 10.10

October 19, 1999

Michael L. Bayer
VP, Finance and Administration
Chief Financial Officer
MotherNature.com, Inc.
490 Virginia Road
Concord, MA 01742

RE:  Noncompetition and Nonsolicitation Agreement

Dear Michael:

Reference is made to that certain Noncompetition and Nonsolicitation Agreement
(the "Agreement") dated of even date herewith between and among
MotherNature.com, Inc., as defined in the Agreement (the "Company") and you, the
execution of which is a condition for the grant to you on August 6, 1999 by the
Board of Directors of the Company of options to purchase seven hundred fifty
thousand (750,000) shares of the Company's common stock.

Notwithstanding anything in the Agreement to the contrary, including without
limitation the provisions of Paragraph 2 thereof, in the event that your
employment with the Company is terminated for any reason, the Company shall pay
you severance payments at your then current base salary rate, including all
benefits and perquisites then accorded to you, including without limitation,
laptop computer, cellular phone and other technological equipment, access to
email, health club membership, etc, for a period of six (6) months after the
effective date of such termination ("Severance"). Your Severance shall be
increased by one (1) month for each additional twelve (12) month period you are
employed by the Company in your current capacity, up to a maximum of twelve (12)
months severance, the calculation of such employment period commencing, for the
purposes of this calculation only, as of July 1, 1999, With respect to any such
health and welfare benefits, you acknowledge that if your employment with the
Company terminates, you may no longer be eligible to participate in the
Company's plans as an employee; however, if you elect to continue any such
coverage under COBRA (or the then prevailing statutory equivalent) or if you
elect to convert to an individual policy to the extent permitted by the
Company's life and/or disability insurance plans, then in either or any such
instance, the Company shall pay the cost of the COBRA premium and/or the cost of
continuing your life and disability insurance benefits on an individual basis
for the period of time you receive severance payments.
<PAGE>

We acknowledge and agree that your Severance is related to your execution of the
Agreement. Accordingly, if you are terminated without cause, then in accordance
with said Paragraph 2, the one-year non-competition restriction shall only be
applicable for so long as the Company pays you Severance

The Company acknowledges and agrees that if your employment with the Company
terminates as a result of or in connection with a material change in ownership
of the Company, including without limitation, as a result of the sale or
transfer of all or substantially all of the stock or assets of the Company in a
single transaction or a series of related transactions, then such termination of
your employment shall be deemed to be without cause.

The foregoing terms were approved by the Board of Directors of the Company, at a
meeting dated October 14, 1999, as the minutes of such meeting so reflect.

                       SIGNATURES CONTINUED ON NEXT PAGE
<PAGE>

MOTHENATURE.COM, INC.

By: /s/ Michael Barach
   ---------------------------
Name:  Michael Barach
Title: Chief Executive Officer and President,
       hereunto duly authorized

Accepted and agreed:

/s/ Michael L. Bayer
---------------------------
Michael L. Bayer

Date: October 19, 1999
     ----------------------

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