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 321 FLI 28 mg 705 M 2 OP 35 2 9 93 129 G 531 2089 V N 100 G 223 44 449 PRA 80 1 85 I85 ANAFRANIL 50 mg 4896 logo and 11 GG 167 INDERAL LA 80 ZA-51 267/25 CP114 VIP 107 Q400 S593 C logo and 4346 SG 319 CL 205 755/93 H152 CL 42 ASC 570 5125 V 54 518 1/8 SC 1