Zonalon (doxepin hydrochloride) Cream, 5% is a topical cream. Each gram contains: 50 mg of doxepin hydrochloride (equivalent to 44.3 mg of doxepin).

This product consists of trimethoprim/sulfamethoxazole double strength (160 mg/800 mg) tablets and phenazopyridine hydrochloride 200 mg tablets for oral administration.

ZOMIG (zolmitriptan) Nasal Spray contains zolmitriptan, which is a selective 5-hydroxy- tryptamine1B/1D (5-HT1B/1D) receptor agonist. Zolmitriptan is chemically designated as (S)-4-[[3-[2-(dimethylamino) ethyl]-1H-indol-5-yl]methyl]-2-oxazolidinone and has the following chemical structure:

ZIAGEN is the brand name for abacavir sulfate, a synthetic carbocyclic nucleoside analogue with inhibitory activity against HIV-1. The chemical name of abacavir sulfate is (1S,cis)-4-[2-amino-6-(cyclopropylamino)-9H-purin-9-yl]-2-cyclopentene-1-methanol sulfate (salt) (2:1). Abacavir sulfate is the enantiomer with 1S, 4R absolute configuration on the cyclopentene ring. It has a molecular formula of (C14H18N6O)2H2SO4 and a molecular weight of 670.76 daltons. It has the following structural formula:

Zarontin (ethosuximide) is an anticonvulsant succinimide, chemically designated as alpha-ethyl-alphamethyl-succinimide, with the following structural formula: