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 K 101 5688 TAK ALG-6.25 ap and logo 550 MP 474 C3 logo and 33 77 KRC500 b 775 93 833 401 158 IL 3581 SZ 788 Triax M050 RD 54 93 28 CM logo and 5307 V250 L58 N120 114 PLIVA 323 C-122 E 18 MDV 93 321 DISTA H69 AAT 101 HP 38 L G 421 1 5 0 C43 DF 1019 TL 706 T 2