Gabapentin is a white to off-white crystalline solid. It is freely soluble in water and both basic and acidic aqueous solutions.
NEURONTIN capsules also contain the following inactive ingredients: lactose, purified talc, maize starch, gelatin, titanium dioxide and Opacode Blue S-1-4118. The 300 mg capsule shell contains the dye iron oxide yellow. The 400 mg capsule shell contains the dyes iron oxide yellow and iron oxide red.
NEURONTIN tablets also contain the following inactive ingredients: poloxamer, copovidone, maize starch, magnesium stearate, candelilla wax and Opadry White YS-1-18111.
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Neurontin (gabapentin) data sheet
Data sheet for Neurontin (gabapentin)