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 191 RIFADIN 150 TR50 PRINIVIL logo 1000 Organon logo and PCE PLIVA 648 396 RP 115 AN 521 CP 332 311 M 152 Onset M0100 AP 84 54 373 R789 30 mg RH V 4172 E T81 BP 815 35 78 PR 2 54 L16 AP 84 10 mg and 3513 953 SG 322 SAT 54 085 N 940 F 24 Pepto Bismol T 543 SZ 467 ZOMIG 2.5 SANDOZ 572