Promethazine HCl 12.5mg+, 25mg+, 50mg ... Perioperative nausea & vomiting: 25mg; may give additional doses of 12.5–25mg at 4–6hr intervals. <2yrs: see Contraindications.

The pharmacokinetics of promethazine hydrochloride after administration of rectal suppositories at three dosage strengths and ... healthy volunteers were given two 12.5-mg promethazine rectal ...

The pharmacokinetics of promethazine administered in oral syrup ... in terms of dose- normalized C max. [a] Phenergan 12.5-mg rectal suppository, Wyeth-Ayerst Laboratories, Radnor, PA, lot 9940524.