Pill Identification by Imprints: M451 Home Pill Identification by Imprints: M451 1 result PHENAZOPYRIDINE 200 MG TAB Side 1: M451 Color: Reddish-Brown Side 2: Shape: Round Other Popular Drug Imprint 7663 PLIVA P0.5 SEARLE P 0 1 MAX PLIVA 467 OS 304 POT 30 PAD 0118 A026 E58 4467 OBX L324 923 44-527 L344 B 073 E503 K7 741 NEORAL 25mg E 171 ANAFRANIL 50 mg DAN 5555 R12 cor 160 G 0511 logo and 667 logo and EK MYLAN TM 100 L100 Theo-24 400 mg 5 mg POML CN 1 WPI 3332 44-502 FENTANYL 100mcg/hr