Gabapentin-induced bilateral lower extremity edema in a patient with pervasive developmental disorder and schizoaffective disorder.

Gabapentin binds to the alpha-2-delta subunit of presynaptic voltage-gated calcium channels and is used for a wide variety of on- and off-label indications. Gabapentin is dosed at total daily doses ranging from 300 to 3600 mg/d, which is generally divided into 3 doses. Although gabapentin is generally well tolerated, 1 potential reported adverse effect is peripheral edema.