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 V26 TREZIX logo 18 C282 ZC 59 PX 3 AN 511 7154 E 757 WPI 3631 DB03 3 7 LILLY 4112 CR 500 48 11 E42 233 BL 60 BP 706 90 L203 SL 456 logo and L001 1300 44-503 150 XL K12 0.2 T 277 MUTUAL 274 B 293 U38 G 2002 WW 66 155 E 215 R428 B M T C 14 HP 228