qsymia - Medication Listings

QSYMIA extended-release capsules are comprised of immediate-release phentermine hydrochloride (expressed as the weight of the free base) and extended-release topiramate. QSYMIA contains phentermine hydrochloride, a sympathomimetic amine anorectic, and topiramate, a sulfamate-substituted monosaccharide. Phentermine Hydrochloride The chemical name of phentermine hydrochloride is α,α-dimethylphenethylamine hydrochloride. The molecular formula is C 10 H 15 N ∙ HCl and its molecular weight is 185.7 (hydrochloride salt) or 149.2 (free base). Phentermine hydrochloride is a white, odorless, hygroscopic, crystalline powder that is soluble in water, methanol, and ethanol. Its structural formula is: Chemical Structure Topiramate Topiramate is 2,3:4,5-di-O-isopropylidene-β-D-fructopyranose sulfamate. The molecular formula is C 12 H 21 NO 8 S and its molecular weight is 339.4. Topiramate is a white to off-white crystalline powder with a bitter taste. It is freely soluble in methanol and acetone, sparingly soluble in pH 9 to pH 12 aqueous solutions and slightly soluble in pH 1 to pH 8 aqueous solutions. Its structural formula is: Chemical Structure QSYMIA QSYMIA (phentermine and topiramate extended-release capsules) is for oral administration and available in four dosage strengths: 3.75 mg/23 mg (phentermine 3.75 mg and topiramate 23 mg) (equivalent to 4.67 mg of Phentermine Hydrochloride USP). 7.5 mg/46 mg (phentermine 7.5 mg and topiramate 46 mg) (equivalent to 9.33 mg of Phentermine Hydrochloride USP). 11.25 mg/69 mg (phentermine 11.25 mg and topiramate 69 mg) (equivalent to 14.0 mg of Phentermine Hydrochloride USP). 15 mg/92 mg (phentermine 15 mg and topiramate 92 mg) (equivalent to 18.66 mg of Phentermine Hydrochloride USP). Each capsule contains the following inactive ingredients: FD&C Blue #1, FD&C Red #3, FD&C Yellow #5 and #6, ethylcellulose, gelatin, methylcellulose, microcrystalline cellulose, povidone, starch, sucrose, talc, titanium dioxide, and pharmaceutical black and white inks.