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 312 logo and 88 RI 5 850 100 101 SG 322 RIL ZE 43 296 93 42 AMBI 448 851 VASCEPA TUSSIGON 862 barr 400 mg L113 A257 E 174 QP 146 BRONKAID 262 M T11 N040 93 26 logo 2666 S 369 N 81 G 3511 COB 735 INS MYLAN 1101 ZC 79 9 5 Lilly 3228 US 10 BG-12 120 mg M U11 93 D