What is a round white pill with m on one side and 4 on the other

White, round pill with imprint 'M' on one side, and '4' on the other is Hydromorphone hydrochloride 4 mg. It is used in the treatment of pain.
Answered by kgb agent Janua E on Saturday, June 16 2012 at 02:42PM EDT
Collection: hydromorphone