Pill Identification by Imprints: 531 Home Pill Identification by Imprints: 531 4 results METHYLPHENIDATE 5 MG TABLET Side 1: MD Color: Yellow Side 2: 531 Shape: Round TRAMADOL ER 100 MG TABLET Side 1: 531 Color: White Side 2: Shape: Round TRAMADOL ER 100 MG TABLET Side 1: 531 Color: White Side 2: Shape: Round TRAMADOL HCL ER 100 MG TABLET Side 1: 531 Color: White Side 2: Shape: Round Other Popular Drug Imprint 93 41 ACTIQ 600 WPI 3631 25 42 U46 261 ML 34 N 739 WPI 338 MONODOX 75 Z310 10 mg M 154 PreQue MT2 TCL 131 54 352 MYLAN ZE 80 T 20 255 44 69 E 511 W 150 logo and 345 654 G455 7188 93 7370 S591 MYLAN 5410 H 604 HH 5410 HP 10 RP103 ZA-12 L 300 MAXALT AAT 051 5/120 ZC 78