There is a M or W on one side and a 4 on the other--round and white pill
Generic Name: Hydromorphone
Strength: 4 mg
Manufacturer: Mallinckrodt Pharmaceuticals
Trade Name: N/A
Class: RX, CII
Size (mm): 7 X 3
Comment: Image courtesy of 4andsic. Imprint M 4
Hydromorphone is in a group of drugs called narcotic pain relievers, also called opioids.
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