Gabapentin

11 DESCRIPTION The active ingredient in Gabapentin Capsules USP is gabapentin, which has the chemical name 1-(aminomethyl)cyclohexaneacetic acid.​‍​​​​​‍​‍‍‍‍​‍‍ The molecular formula of gabapentin is C 9 H 17 NO 2 and the molecular weight is 171.24. The structural formula of gabapentin is: Gabapentin is a white to off-white crystalline solid with a pK a1 of 3.7 and a pK a2 of 10.7. It is freely soluble in water and both basic and acidic aqueous solutions. The log of the partition coefficient (n-octanol/0.05M phosphate buffer) at pH 7.4 is –1.25. Each Gabapentin capsule contains 100 mg, 300 mg, or 400 mg of gabapentin and the following inactive ingredients: Pregelatinized Maize starch, talc, gelatin, titanium dioxide, yellow iron oxide (300 mg and 400 mg only), and red iron oxide (300 mg and 400 mg only), black iron oxide (300 mg and 400 mg only). Ingredients of Imprinting Ink( Black SW-9049) are Black Iron Oxide NF(E 172), Butyl Alcohol NF, Dehydrated Alcohol USP, Isopropyl Alcohol USP, Potassium Hydroxide NF, Propylene Glycol USP, Shellac NF, and Strong Ammonia Solution NF.