As with most hypnotics, Placidyl was indicated for use in the treatment of insomnia for a short period of time (a week or two). Overdose may be marked by a variety of symptoms, including confusion, fever, peripheral numbness and weakness, reduced coordination and muscle control, slurred speech, reduced heartbeat, respiratory depression, and in extreme overdoses, coma and death. Along with expected sedative effects of relaxation and drowsiness, adverse reactions to ethchlorvynol include skin rash, faintness, restlessness and euphoria. Patent 2,746,900 Hypnotic Agent and Method of Making the Same (1956) Glauser,. "Ethchlorvynol (Placidyl)-induced pulmonary edema". After prolonged use, withdrawal symptoms may include convulsions, hallucinations, and amnesia. Advertisment ad adsense adlogger. Complementary and scalable digital technology platforms accelerate growth for our partners.