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.