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 8.6 CP 405 NC 667 6 mg MYLAN 351 243 MP 303 I 23 M A12 W 781 ADIPEX-P ER 7 V-Z-F LLORENS PRIFTIN U-S LZ2 447 A 50 TL614 NL 570 424 773 COUMADIN 5 A3 045 A 40 RP 1.25 logo and 660 M L19 logo and 667 1122 4211 V CORGARD 80 VBZ 80 1441 440 052 1451 47 Y 16