Gabapentin as add-on therapy for refractory partial epilepsy: results of five placebo-controlled trials.
Gabapentin ( GBP, Neurontin), a new antiepileptic drug (AED) with a novel mechanism of action, exhibits low acute toxicity in mice, rats, and monkeys, and is not teratogenic. GBP pharmacokinetics are simple and predictable; GBP is eliminated by urinary excretion, is not protein-bound or metabolized, does not induce or inhibit hepatic enzymes, and does not interact with other AEDs. In five placebo-controlled, double-blind studies of GBP as add-on therapy, 307 patients with refractory partial seizures received placebo and 485 received GBP dosages of 600, 900, 1,200, or 1,800 mg/day for 12 weeks following a 12-week baseline. Seizure frequency, as measured by response ratio and responder rate, was improved for patients receiving GBP compared with placebo; differences were statistically significant in two of the three large, multicenter studies. Adverse events occurred in 76% of GBP-treated patients, compared with 57% of placebo-treated patients. No serious adverse events were consistently attributable to GBP therapy. Changes in clinical laboratory values were not considered clinically important. GBP represents a significant addition to the armamentarium of AEDs available for treatment of patients with epilepsy.[1]References
- Gabapentin as add-on therapy for refractory partial epilepsy: results of five placebo-controlled trials. Leiderman, D.B. Epilepsia (1994) [Pubmed]
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