Benztropine mesylate is a synthetic compound containing structural features found in atropine and diphenhydramine.

It is designated chemically as 8-azabicyclo[3.2.1] octane, 3-(diphenylmethoxy)-,endo, methanesulfonate. Its empirical formula is C₂₁H₂₅NO•CH₄O₃S, and its structural formula is:

Benztropine mesylate is a crystalline white powder, very soluble in water, and has a molecular weight of 403.54. COGENTIN* (Benztropine Mesylate) is supplied as a sterile injection for intravenous and intramuscular use.

Each milliliter of the injection contains:

Benztropine mesylate ..........1 mg
Sodium chloride ...............9 mg
Water for injection q.s. . ....1 mL

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