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.

Tag: hydromorphone 
Saturday, June 16 2012

Source: http://www.drugs.com/imprints/m-4-489.html

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