In an attempt to overcome the inherent disadvantage of narcotic antitussive therapy, three basic alkoxy-alkyl esters of phenothiazine-10-carboxylic acid were synthesized and tested for pharmacological activity. These compounds possessed antitussive activity in the cat in the range of activity of codeine. Dimethyl-amino-ethoxy-ethyl phenothiazine-10-carboxylate was chosen, on the basis of strong antitussive activity coupled with low acute toxicity and low antispasmodic activity, for chronic toxicity studies and clinical trial. This compound is devoid of central depressant or analgesic properties and possesses a moderate local anaesthetic action.
Pharmacological studies on grayanoids. (I). Central depressant action of grayanotoxin (III)
