Gramine, 2-methylgramine, N-methyltryptamlne, N,N-methyltryptamine and 2-methyl-3-ethyl-5-aminoindole have been shown to possess a moderate and reversible enteraminolytlc activlty when tested on the diuresis of hydrated rats and on the rat estrous-uterus. The alkalolds of the harmine group (harmlne, harmol, harmaline, harmalol) are, on the contrary, lacklng of any appreciable anti-enteramlne actlon .