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Q: White, oval tablets, 1 side has an "M" with a square around it, The other side has the numbers "1721". There is no listing @ poison control or rxlist. Do you have any idea what they may be?

A: According to the Ident-a-drug Referenence, a white oval tablet with an "M" on one side and "1721" on the other contains 100 mg Propoxyphene Napsylate and 650 mg Acetaminophen.



Propoxyphene Napsylate is a synthetic opioid used in the relief of pain. It is in schedule IV in the United States, making it illegal to buy, sell, or possess without a prescription.


Asked By : unknown
Answered By : fire
Published Date : 10 / 27 / 2002
Last Edited Date : 3 / 12 / 2004
Question ID : 3003

Categories: [ Pharmaceutical ID ]



Ask Erowid v1.7 - Jul, 2005

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