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 N111 274 S407 MP 9 M 261 ML 64 SANDOZ 573 M 944 MYLAN 2046 IN150 8 05 54 122 SZ 344 WPI 867 287 414 I1 1157 220 664 R179 RIFATER AN 2 Vivelle-Dot 0.0375 mg/day L421 ZGNX 10 mg K 56 E448 RPR 202 FOSTEUM 52003 MP 47 ASC TA4M 025 K 55 G441 5 300 325 WW65 982