In therapeutic dosage dextromethorphan does not inhibit ciliary activity. Promethazine is an H 1 receptor blocking agent. In addition to its antihistaminic action, it provides clinically useful ...

The pharmacokinetics of promethazine hydrochloride after administration of rectal suppositories at three dosage strengths and oral syrup were studied. The study had an open-label, randomized ...

In addition, a number of subjects in each treatment group had measurable promethazine concentrations at time zero (carry-over from the previous dose), ranging from 0.05 to 1.3 ng/mL. The mean ...