During recent years various tranquillizing drugs have been used therapeutically, namely, chlorpromazine hydrochloride (Largactil), reserpine (Serpasil), benactyzine hydrochloride (Suavitil) and hydroxyzine (Atarax) in mental disorders. Chlorpromazine and reserpine, though effective to a certain extent in mental disorders of the disturbed type, have the disadvantage of certain side-effects which have necessitated reduction and even cessation of the drugs, even when proving clinically efficacious.