Document:

EX-10.1

Exhibit 10.1

STOCK OPTION TERMS FOR A NON-QUALIFIED STOCK OPTION (NQSO)

UNDER THE MERCK & CO., INC. 2004 INCENTIVE STOCK PLAN

This is a summary of the terms applicable to the stock option specified on this document.
Different terms may apply to any prior or future stock option. They may be amended by the
Compensation and Benefits Committee of the Board of Directors as permitted by the ISP.

I. GENERAL INFORMATION

This stock option becomes exercisable by the holder (“you”) in equal installments (subject to
rounding process) on the first, second and third anniversaries of the Grant Date, as determined by
the Company. This stock option expires on its Expiration Date, which is the day before the tenth
anniversary of the Grant Date. If your employment with the Company is terminated, your right to
exercise this stock option will be determined according to the terms in Section II.

II. TERMINATION OF EMPLOYMENT

A. General Rule. If your employment is terminated for any reason other than those specified in
the following paragraphs, the portion of this stock option that is unvested will expire on the date
your employment ends; the portion of this stock option that is vested will expire on the day before
the same date of the third month after your employment ends, but in no event later than the
original Expiration Date.

B. Retirement. If you retire from service with the Company, this stock option will continue to
become exercisable on applicable Vesting Dates and will expire on its original Expiration Date.

C. Separation. If your employment is terminated and the Company determines that such termination
resulted from the elimination of your job or the sale of your subsidiary, division or joint
venture, the portion of this stock option that is unvested will vest immediately upon such
termination. Whether already vested on the date of your separation or vested as a result of your
separation, this stock option will expire the day before the second anniversary of the date your
employment with the Company ends, but in no event later than the original Expiration Date.
Notwithstanding the foregoing, the Compensation and Benefits Committee of the Board of Directors of
Merck & Co., Inc., may determine, for purposes of this stock option grant, whether employment with
an entity that is established from the Company’s spin off, split off, split up or distribution of
equity securities in connection with that entity constitutes a termination of employment or
separation, and may make adjustments, if any, as it deems appropriate, at the time of the
distribution of such equity securities, in the kind and/or number of shares subject to this option,
and/or in the option price of such option.

D. Misconduct. If your employment is terminated as a result of your deliberate, willful or gross
misconduct, this stock option (whether vested or unvested) will expire immediately upon your
receipt of notice of such termination.

E. Death. If you die, the portion of this stock option that is unvested will vest immediately
upon your death. Whether already vested on the date of your death or vested as a result of your
death, this stock option will expire on the earlier of: (a) the day before the third anniversary of
your death, or (b) the later of (i) the Original Expiration date or (ii) the day before the first
anniversary of your death. This stock option will expire on such earlier date than otherwise
specified in this paragraph as may be required under applicable non-U.S. law (e.g., in France, six
months from the date of death).

F. Joint Venture. Employment with a joint venture or other entity in which the Company has
determined that it has a significant business or ownership interest (a “JV”) is not considered
termination of employment for purposes of this stock option. If you transfer employment from the
Company to a JV or from a JV to the Company, such employment must be approved by, and contiguous
with employment by, the Company or the JV. The terms set out in paragraphs A-E above apply to this
stock option while the option holder is employed by the JV.

III. TRANSFERABILITY

This stock option is not transferable and may not be assigned or otherwise transferred except,
under specific terms, by executives who hold or who retired within the prior twelve (12) months
from a Grade 1 or Section 16 position.

This stock option is subject to the provisions of the 2004 Incentive Stock Plan and the Rules and
Regulations thereunder established by the Compensation and Benefits Committee of the Board of
Directors of Merck & Co., Inc. You may access the Merck Stock Option homepage at
http://humres.merck.com/stockoptions, which includes links to the Prospectus for the 2004
Incentive Stock Plan and the Company’s Annual Report and Proxy Statement.EX-10.2

Exhibit 10.2

RESTRICTED STOCK UNIT TERMS

FOR ANNUAL GRANT

UNDER THE MERCK & CO., INC. 2004 INCENTIVE STOCK PLAN

This is a summary of the terms applicable to the Restricted Stock Unit (RSU) Award specified
on this document. Different terms may apply to any prior or future RSU Awards. They may be
amended by the Compensation and Benefits Committee of the Board of Directors as permitted by the
ISP.

I. GENERAL INFORMATION

A. Restricted Period. The Restricted Period is the period during which this RSU Award is
restricted and subject to forfeiture. This RSU Award is restricted until the third anniversary of
the Grant Date.

B. Dividend Equivalents. During the Restricted Period, dividend equivalents will be paid to the
holder (“you”) around the same time dividends are paid by the Company on Merck Common Stock. Any
payment of dividend equivalents shall be reduced to the extent necessary for the Company to satisfy
any tax or other withholding obligations. The RSU Award does not carry voting rights with respect
to Merck common stock.

C. Distribution. Upon the expiration of the restriction, you will be entitled to receive a
number of shares of Merck common stock equal to the number of RSUs that have become unrestricted.
Prior to distribution, you must deliver to the Company an amount the Company determines to be
sufficient to satisfy any amount required to be withheld, including applicable taxes. The Company
may, in its sole discretion, decide to withhold from the RSU Award distribution a number of shares
to pay the amount of applicable withholding (including taxes).

II. TERMINATION OF EMPLOYMENT

If your employment with the Company is terminated, your right to this RSU Award will be determined
according to the terms in this Section II.

A. General Rule. If your employment is terminated prior to the end of the restricted period for
any reason other than those specified in the following paragraphs, this RSU Award will be forfeited
on the date your employment ends.

B. Separation. If your employment is terminated and the Company determines that such termination
resulted from the elimination of your job or the sale of your subsidiary, division or joint
venture, a pro rata portion (based on the number of months held) of any restricted portion of this
Award shall be distributed as soon as possible after such separation date.

C. Retirement. If you terminate employment by retirement (including early and disability
retirement) (“Retirement”) on or after the same day of the sixth month after this RSU Award is
granted, then this RSU Award will continue and be distributable in accordance with its terms as if
employment had continued and will be distributed at the time active RSU Grantees receive
distributions with respect to this Restricted Period. If your Retirement occurs before the same
day of the sixth month after this RSU Award is granted, then this RSU Award will be forfeited on
the date your employment ends.

D. Death. If you die, a pro rata portion (based on the number of months held) of any restricted
portion of this Award shall be distributed to your estate as soon as possible after your death.

E. Misconduct. If your employment is terminated as a result of your deliberate, willful or gross
misconduct, this RSU Award, if unvested, will be forfeited immediately upon your receipt of notice
of such termination.

F. Joint Venture. Employment with a joint venture or other entity in which the Company has a
significant business or ownership interest is not considered termination of employment for purposes
of this RSU Award. Such employment must be approved by, and contiguous with employment by, the
Company, as described more fully in the Rules and Regulations. The terms set out in paragraphs A-E
above apply to this RSU Award while you are employed by the joint venture or other entity.

III. TRANSFERABILITY

This RSU Award is not transferable and may not be assigned or otherwise transferred.

This RSU Award is subject to the provisions of the 2004 Incentive Stock Plan and the Rules and
Regulations thereunder established by the Compensation and Benefits Committee of the Board of
Directors of Merck & Co., Inc. You may access the Merck Stock Option homepage at
http://humres.merck.com/stockoptions, which includes links to the Prospectus for the 2004
Incentive Stock Plan and the Company’s Annual Report and Proxy Statement.EX-10.3

Exhibit 10.3

RESTRICTED STOCK UNIT TERMS

FOR A LEADER SHARES GRANT

UNDER THE MERCK & CO., INC. 2004 INCENTIVE STOCK PLAN

This is a summary of the terms applicable to the Restricted Stock Unit (RSU) Award specified on
this document. Different terms may apply to any prior or future RSU Awards. They may be amended
by the Compensation and Benefits Committee of the Board of Directors as permitted by the ISP.

I. GENERAL INFORMATION

A. Restricted Period. The Restricted Period is the period during which this RSU Award is
restricted and subject to forfeiture. This RSU Award is restricted until the third anniversary of
the Grant Date.

B. Dividend Equivalents. During the Restricted Period, dividend equivalents will be paid to you
around the same time dividends, if any, are paid by the Company on Merck Common Stock. Any payment
of dividend equivalents shall be reduced to the extent necessary for the Company to satisfy any tax
or other withholding obligations. The RSU Award does not carry voting rights with respect to Merck
common stock.

C. Distribution. Upon the expiration of the restriction, you shall be entitled to receive a
number of shares of Merck common stock equal to the number of RSUs that have become unrestricted.
Prior to distribution, you must deliver to the Company an amount the Company determines to be
sufficient to satisfy any amount required to be withheld, including applicable taxes. The Company
may, in its sole discretion, decide to withhold from the RSU Award distribution a number of shares
to pay the amount of applicable withholding (including taxes).

II. TERMINATION OF EMPLOYMENT

If your employment with the Company is terminated, your right to this RSU Award will be determined
according to the terms in this Section II.

A. General Rule. If your employment is terminated prior to the end of the restricted period for
any reason other than those specified in the following paragraphs, this RSU Award will be forfeited
on the date your employment ends.

B. Separation. If your employment is terminated and the Company determines that such termination
resulted from the elimination of your job or the sale of your subsidiary, division or joint
venture, a pro rata portion (based on the number of months held) of any restricted portion of this
Award shall be distributed as soon as possible after such separation date.

C. Retirement. If you retire from service with the Company prior to the first anniversary of the
Grant Date, this RSU Award will be forfeited on the last day of employment. If you retire after
the first anniversary of the Grant Date, a pro rata portion (based on the number of months held) of
any restricted portion of this Award shall be distributed as soon as possible after such
retirement.

D. Death. If you die, a pro rata portion (based on the number of months held) of any restricted
portion of this Award shall be distributed to your estate as soon as possible after your death.

E. Misconduct. If your employment is terminated as a result of your deliberate, willful or gross
misconduct, this RSU Award, if unvested, will be forfeited immediately upon your receipt of notice
of such termination.

F. Joint Venture. Employment with a joint venture or other entity in which the Company has a
significant business or ownership interest is not considered termination of employment for purposes
of this RSU Award. Such employment must be approved by, and contiguous with employment by, the
Company, as described more fully in the Rules and Regulations. The terms set out in paragraphs A-E
above apply to this RSU Award while you are employed by the joint venture or other entity.

III. TRANSFERABILITY

This RSU Award is not transferable and may not be assigned or otherwise transferred.

This RSU Award is subject to the provisions of the 2004 Incentive Stock Plan and the Rules and
Regulations thereunder established by the Compensation and Benefits Committee of the Board of
Directors of Merck & Co., Inc. You may access the Merck Stock Option homepage at
http://humres.merck.com/stockoptions, which includes links to the Prospectus for the 2004
Incentive Stock Plan and the Company’s Annual Report and Proxy Statement.

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