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 Lilly 2 ZA-50 V241 NCH 0820 nitroglycerin 0.4mg/hr Phillips' ANAFRANIL 25 mg 44 449 E652 MP 657 K 6 S 111 E 47 LAN 1109 WPI 858 cor 215 T logo and 152 logo and 75 TL050 B854 G 3742 MYLAN 6726 5/120 A CH MP 444 b 95 GIL 0.5 TL019 3604 West-ward 3141 403 par 258 G 51 93 089 PD 535 54 356 M N4 173 AB