Abstract
Gentamicin in concentrations of 0.05–0.2 mmol litre−1 blocked neuromuscular transmission in the toad sartorius nerve-muscle preparation by decreasing the release of transmitter. In concentrations of 0.5–1 mmol litre−1 it decreased the amplitude of the miniature end-plate current by a curare-like action, without affecting the mean open channel lifetime.