Pill Identification by Imprints: M C4 Home Pill Identification by Imprints: M C4 1 result CAPTOPRIL 100 MG TABLET Side 1: M C4 Color: White Side 2: Shape: Round Other Popular Drug Imprint L 4 1 RP T 193 M151 MX 15 WATSON 582 EP 137 C 271 n 574 M R RX121 WPI 3630 21 ZC 78 P13 BVF L178 5150 S44 749 P P T535 logo and 345 H144 609 A3 P10 M450 P 300 RX 504 VIBRA MC 32 AN 10 ML 96 PLIVA 469 NT 432 RP102 M04 3.0 L212