Prolactin-releasing effects of centrally-acting drugs in the red-spotted newt, Notophthalmus viridescens.

Intraperitoneal injections of alpha-methyl-para-tyrosine and reserpine had clear-cut second metamorphic effects, identical to those induced by prolactin, in the red eft (terrestrial stage) of the redspotted newt, Notophthalmus viridescens. Pentobarbital had less pronounced effects, and alpha-methyl-meta-tyrosine had no effect other than the darkening of the skin.