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For the first time, a novel carbon nanotube bed electrode impregnated with silver-nanoparticles (AgNPs) for the determination of trace amounts of gabapentin (GBP) is described. We synthesized the AgNPs via a new procedure. The voltammetric behavior of the electrode was investigated by cyclic voltammetry. There were linear relationships in the ranges from 3.1 10 À9 to 2.9 10 À2 M and from 1.0 10 À8 to 1.0 10 À2 GBP with square wave and differential pulse voltammetric peak currents, respectively. The detection limits were 5.6 10 À10 and 9.7 10 À9 M, respectively. The electrode showed excellent response over a period of 2 months and was successfully applied in human plasma and pharmaceutical capsular products.