A seizure, and electroencephalographic signs of a lowered seizure threshold, associated with fluvoxamine treatment of obsessive-compulsive disorder.

A 38-year-old patient with severe obsessive-compulsive disorder received fluvoxamine in a clinical study. Psychometric ratings showed marked clinical improvement in the third week of fluvoxamine administration, but after 8 weeks, at a dose of 300 mg per day, he suffered a grand mal seizure after drinking a glass of beer (0.2 liter). He had no history of previous epileptic seizures. Careful neurological evaluation including computer tomography and magnetic resonance imaging of the brain revealed no signs of acute disease. EEG before the fit did not show epileptiform activity; after the fit, spikes and spike-wave complexes appeared, which disappeared upon discontinuation of fluvoxamine. Since his obsessive-compulsive symptoms had responded well to fluvoxamine and worsened after its discontinuation, the drug was cautiously reintroduced. Improvement of the obsessive-compulsive symptoms was observed again, but spikes and spike-wave complexes reappeared at a dose of 50 mg per day. Under anticonvulsant treatment with carbamazepine, fluvoxamine was increased to 100 mg per day. No seizures occurred during a follow-up to two years.