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 1105 804 E 655 T 18 CLR 50 DYN-055 AAT 104 54 922 FP WATSON 462 GG C6 P 2 M04 3.0 E122 C 35 KALI R179 1427 AC 41 5124 V T558 M EN3 AA 16 10 00 EP 136 TEMODAR N 77 A-263 P 612 GS MZ1 M 412 CORTEF 10 deplin ORTHO or ORTHO P LES200 ALO200 ALTO D05 TL051 LL713