Abstract
Tritium labelled β-phenethylamine and tyramine were incubated with slices of mouse brain and heart. Cocaine (3 × 10−5M) caused a reduction of 30% in the uptake of tyramine as well as in the formation of its metabolite 4-hydroxyphenylacetic acid. Cocaine had no effect on either the uptake of phenethylamine nor its deamination to phenylacetic acid.