Pill Identification by Imprints: RX 504 Home Pill Identification by Imprints: RX 504 0 results Nothing Found!!! Other Popular Drug Imprint Z or M HP 228 N 77 584 GG 51 L050 AZ 267 L 179 Fentanyl 75 mcg/hr EP 25 CM2 PA4 logo and 6451 1182 AA 72 44 159 PC 22 396 SZ 438 M 75 U24 BL 50 54 177 NL 711 ZGNX 20 mg LOTENSIN HCT DX 31 MD 140 C 91 XP650 D 86 M 575 M 1840 E502 M 1820 U42 E 42 54 144 ORAP 1