Pill Identification by Imprints: M 547 Home Pill Identification by Imprints: M 547 2 results MERCAPTOPURINE 50 MG TABLET Side 1: M 547 Color: Off-White Side 2: Shape: Round MERCAPTOPURINE 50 MG TABLET Side 1: M 547 Color: Off-White Side 2: Shape: Round Other Popular Drug Imprint M RN4 ASPIRIN L UPSHER-SMITH 0228 A34 SZ L950 1048 OS 214 125SLXP 551 M 38 SLOW- MAG T536 625 E 132 LASIX R barr 24 mg 209 or 274 651 FENTANYL 400 ZL 2 SCI 500 676 C57 93 308 logo and A4 G 45 W962 0.75 logo and 56 MYLAN 6320 TriStart n 353 DO or DP ML 1 MP 26 270 LCE 75 L142 ER 2