Pill Identification by Imprints: M 1840 Home Pill Identification by Imprints: M 1840 1 result METHYLPHENIDATE ER 40 MG CAP Side 1: M 1840 Color: Yellow Side 2: 40 mg Shape: Oblong Other Popular Drug Imprint R575 R-264 W 904 logo and 511 APO 034 50 223 ALEVE 6 mg 5 XL GG 488 67 Y AMGEN 106 G 2002 CombiPatch 0.05/0.14 mg per day GG 953 RD 72 F19 25 n 575 R4 U 135 M 473 M32 SE 5 LL O10 HP 362 44 438 FR32 AN 441 M121 1 8 104 DG1 54 150 1300 H108 8 08 1070 5/500 11