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 C4 or C2 UL250 E 136 R332 PE HP 61 10 31 134 WW 27 L424 TI 01 I86 DD or DJ or DH or DN or DT 153 G 51 981 826 ALKA SELTZER and logo MP 79 MYLAN 5420 805 Syntho CRESTOR 5 44-329 MX 24 BCT 2 1/2 G821 NT or EP E 102 VS 80 1073 10/1000 403 RI90 ZA 63 RU10 DAN 150 MARPLAN 10 EP 134 T 18 F