Pill Identification by Imprints: S591 Home Pill Identification by Imprints: S591 1 result TELMISARTAN-HYDROCHLOROTHIAZIDE 40-12.5 MG TB Side 1: S591 Color: Pink Side 2: Shape: Oblong Other Popular Drug Imprint C51 Nitroglycerin 0.6mg/hr 4212 R180 268/40 GG 53 R-264 GG 58 K 71 M 76 par 220 664 40 CAR/RX P5 VISMO E 137 POT 20 299 E42 982 or 983 Rifampin 300 AN 545 DISTA 3104 N192 MICROZIDE M 572 C171 N 81 BL 04 M MN2 1008 N 350 GSI1000 fentanyl 1200 mcg WAR 10 DAN 5 T 10 logo and 2848 G 423