RAZADYNE† ER (galantamine hydrobromide) is a reversible, competitive acetylcholinesterase inhibitor. It is known chemically as (4aS,6R,8aS)-4a,5,9,10,11, 12-hexahydro-3-methoxy-11-methyl-6H- benzofuro [3a,3,2-ef][2] benzazepin-6-ol hydrobromide. It has an empirical formula of C₁₇H₂₁NO₃ †HBr and a molecular weight of 368.27. Galantamine hydrobromide is a white to almost white powder and is sparingly soluble in water. The structural formula for galantamine hydrobromide is:

RAZADYNE† ER is available in opaque hard gelatin extended release capsules of 8 mg (white), 16 mg (pink), and 24 mg (caramel) containing galantamine hydrobromide, equivalent to respectively 8, 16 and 24 mg galantamine base. Inactive ingredients include gelatin, diethyl phthalate, ethylcellulose, hypromellose, polyethylene glycol, titanium dioxide and sugar spheres (sucrose and starch). The 16 mg capsule also contains red ferric oxide. The 24 mg capsule also contains red ferric oxide and yellow ferric oxide.

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