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 CP 25 44 628 HE1 Z340 40 mg 104 W 25 LCI 1353 WPI 3631 LILLY 4117 McNEIL METHADOSE 40 GG 772 P3 AN899 15 VH5 logo and 2918 I 64 GIL 304 WAT SON R137 MYLAN 5222 MYLAN TM 140 AMBI 409 737 ARICEPT U 128 EM2 WATSON 630 or WATSON 075 P297 32 Y01 FS2 B 181 T582 39 U 136 XANAX 0.5 4740 W 781 MYLAN 531 A23