do you mean the shape is oblong (or capsule shaped)? that would be...
Acetaminophen 500mg;
Hydrocodone Tablets 10mg
Generic
Lortab 10 made by Mallinckrodt Inc Pharmaceuticals Group
a schedule III controlled substance
if it is round, I don't know what it is. Is the M on the same side as the 363? is it scored? I'll keep looking. Hope this helped.
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