... Who is the manufacturer? Abbott?
There is a hydromorphone 4mg pill available with the imprint M 4 but it appears sort of beige. Manufactured by Mallinckrodt Medical Inc. This is a generic of Dilaudid.
There is also a white pill with M 4 imprint, which is acetaminophen and codeine phosphate Strengths 300 mg / 60mg
Manufacturer / Distributor
Please see link below to see is any of these pills fit your description.
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