Redux (dexfenfluramine hydrochloride capsules), an anti-obesity drug, is a serotonin reuptake inhibitor and releasing agent. Redux is available for oral administration in white, opaque, hard-gelatin capsules. The active ingredient is dexfenfluramine hydrochloride. Each capsule contains 15 mg dexfenfluramine hydrochloride. Inactive ingredients include: lactose, gelatin capsule, corn starch, microcrystalline cellulose, talc, titanium dioxide, magnesium stearate, colloidal silicon dioxide, and edible ink.

Dexfenfluramine hydrochloride, a white to off-white crystalline powder, is designated chemically as (S)-N-ethyl-alpha-methyl-3-(trifluoromethyl) benzeneethanamine hydrochloride and has a molecular weight of 267.7. Its empirical formula is C₁₂H₁₆F₃N·HCl. Dexfenfluramine is freely soluble in water, alcohol, chloroform, and methanol The pKa of dexfenfluramine hydrochloride is 10.

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