Pill Identification by Imprints: M450 Home Pill Identification by Imprints: M450 1 result PHENAZOPYRIDINE 100 MG TAB Side 1: M450 Color: Reddish-Brown Side 2: Shape: Round Other Popular Drug Imprint RD 54 Z47 255 GG 634 ZC41 M 1840 WFHC WATSON 862 F 71 UPSHER-SMITH 0228 N2 P75 HP 66 RX 505 VASCEPA VASO 5 VP and logo PH 024 K 56 F1 PH 044 WATSON 2404 MEDROL 32 C 92 876 HP 18 WW969 54 731 AN 361 93 7372 U-S 42 MYLAN ZE 80 1V125 X08 44 428 L42 Pin-X RH CombiPatch 0.05/0.14 mg per day BP 813