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A member asked:

Please tell me the onset of action of phenergan (promethazine) suppositories? how long after inserting can i use the restroom? how long will the medicine last?

A doctor has provided 1 answer

Phenergan (promethazine) supp.: Phenergan (promethazine) suppositories usually dissolve completely and start to work in approximately half an hour. Phenergan (promethazine) is usually recommended at 4 hour intervals.

Dr Benoit agreed

Answered 10/28/2014

3.6k views

Thank

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