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ENABLEX® (darifenacin) extended-release tablets are indicated for the treatment of overactive bladder with symptoms of urge urinary incontinence, urgency and frequency.
ENABLEX® (darifenacin) is an extended-release tablet which contains 7.5 mg or 15 mg darifenacin as its hydrobromide salt. The active moiety, darifenacin, is a potent muscarinic receptor antagonist.
Chemically, darifenacin hydrobromide is (S)-2-{1-[2-(2,3-dihydrobenzofuran-5-yl)ethyl]-3-pyrrolidinyl}-2,2-diphenylacetamide hydrobromide. The empirical formula of darifenacin hydrobromide is C28H30N2O2.HBr.
The structural formula is

Darifenacin hydrobromide is a white to almost white, crystalline powder, with a molecular weight of 507.5.
ENABLEX is a once a day extended release tablet and contains the following inactive ingredients: dibasic calcium phosphate, hypromellose (hydroxypropyl methylcellulose), magnesium stearate, polyethylene glycol, talc, titanium dioxide. The 15-mg tablet also contains iron oxide red and iron oxide yellow.