Lidocaine and procaine seizure thresholds were studied. The i.p. median convulsant dose (CD50) of lidocaine and procaine with saline pre-treatment was 95 and 240 mg/kg, respectively. Dopamine depletion by pre-treatment with d1-α-methyl-p-tyrosine plus dihydroxyphenylserine resulted in a significant drop of CD50 to 69 and 175 mg/kg for lidocaine and procaine, respectively. Serotonin depletion by pre-treatment with p-chlorophenylalanine resulted in a significant drop of CD50 to 68 mg/kg for lidocaine, but no significant change for procaine.
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