TARKA® (trandolapril/verapamil hydrochloride ER) combines a slow release formulation of a calcium channel blocker, verapamil hydrochloride, and an immediate release formulation of an angiotensin converting enzyme inhibitor, trandolapril.

Verapamil Component — Verapamil hydrochloride is chemically described as benzeneacetonitrile, α[3-[[2-(3,4- dimethoxyphenyl) ethyl] methylamino] propyl]-3,4-dimethoxy-α-(1-methylethyl) hydrochloride. Its empirical formula is C₂₇H₃₈N₂O₄ HCl and its structural formula is:

Verapamil hydrochloride is an almost white crystalline powder, with a molecular weight of 491.08. It is soluble in water, chloroform, and methanol. It is practically free of odor, with a bitter taste.

Trandolapril Component — Trandolapril is the ethyl ester prodrug of a nonsulfhydryl angiotensin converting enzyme (ACE) inhibitor, trandolaprilat. It is chemically described as (2S,3aR,7aS)-1-[(S)-N-[(S)-Carboxy-3-phenylpropyl]alanyl]hexahydro- 2-indolinecarboxylic acid, 1-ethyl ester. Its empirical formula is C₂₄H₃₄N₂O₅ and its structural formula is:

Trandolapril is a colorless, crystalline substance with a molecular weight of 430.54. It is soluble ( > 100 mg/mL) in chloroform, dichloromethane, and methanol.

TARKA tablets are formulated for oral administration, containing verapamil hydrochloride as a controlled release formulation and trandolapril as an immediate release formulation. The tablet strengths are trandolapril 2 mg/verapamil hydrochloride ER 180 mg, trandolapril 1mg/verapamil hydrochloride ER 240 mg, trandolapril 2 mg/verapamil hydrochloride ER 240 mg, and trandolapril 4 mg/verapamil hydrochloride ER 240 mg. The tablets also contain the following ingredients: corn starch, dioctyl sodium sulfosuccinate, ethanol, hydroxypropyl cellulose, hypromellose, lactose, magnesium stearate, microcrystalline cellulose, polyethylene glycol, povidone, purified water, silicon dioxide, sodium alginate, sodium stearyl fumarate, synthetic iron oxides, talc, and titanium dioxide.

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