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The definition of Ambien.....
Main Entry: Am·bi·en
Pronunciation: 'am-bE-"en
Function: trademark
—used for a preparation of the tartrate of zolpidem

and the definitions of amnesiac.

am·ne·sia ( P ) Pronunciation Key (m-nzh)
n.
Partial or total loss of memory, usually resulting from shock, psychological disturbance, brain injury, or illness.

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[Greek amnsi, forgetfulness, probably from amnsti, from amnstos, not remembered : a-, not; see a-1 + mimnskein, mn-, to remember; see men-1 in Indo-European Roots.]
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am·nesi·ac (-nz-k, -zh-k) or am·nesic (-zk, -sk) n. & adj.
am·nestic (-nstk) adj.

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Source: The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2000 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

am·ne·si·ac (m-nz-k, -zh-k)
n.

One who is afflicted with amnesia.

Source: The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Main Entry: am·ne·si·ac
Pronunciation: -z(h)E-"ak
Variant: also am·ne·sic /-zik, -sik/
Function: noun
: a person affected with amnesia

Source: Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.

Main Entry: am·ne·sic
Pronunciation: am-'nE-zik, -sik
Variant: also am·ne·si·ac /-z(h)E-"Ak/
Function: adjective
: of or relating to amnesia : affected with or caused by amnesia <an amnesic patient> <an amnesic trauma>