Pill imprint M 4 has been identified as Hydromorphone hydrochloride 4 mg.
Hydromorphone is used in the treatment of chronic pain; pain; cough; anesthetic adjunct and belongs to the drug class narcotic analgesics. Risk cannot be ruled out during pregnancy.
Hydromorphone 4 mg has a high potential for abuse. The drug has a currently accepted medical use in treatment in the United States or a currently accepted medical use with severe restrictions. Abuse of the drug may lead to severe psychological or physical dependence.
Pill image: https://www.drugs.com/imprints/m-4-489.html
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