The effects of the pyrethroids deltamethrin and cismethrin on nerve excitability in rats.

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Abstract
Deltamethrin [insecticide] produced a prolonged period of increased excitability following the passage of a nerve impulse, which was dose-related and lasted up to 400 ms. Excitability changes were detected without neurological signs following a single i.v. injection of 0.5 mg/kg and feeding 200, 100 and 50 ppm in the diet for up to 8 wk. No changes were detected following 0.3 mg/kg i.v. or 25 ppm in the diet. No cumulative effects were detected during chronic feeding. Cismethrin [insecticide] produced increased nerve excitability only between 2 and 4 ms after a nerve impulse. Excitability changes after cismethrin were biphasic during the 1st 20 ms.