Pill Identification by Imprints: S 521 Home Pill Identification by Imprints: S 521 2 results CETIRIZINE HCL 10 MG TABLET Side 1: S 521 Color: White Side 2: Shape: Rectangular (Rounded End) CETIRIZINE HCL 10 MG TABLET Side 1: S 521 Color: White Side 2: Shape: Rectangular (Rounded End) Other Popular Drug Imprint par 009 Z11 0813 CLOM 75 1049 VIVUS 8.6 CL 76 TL614 30/4 OS 213 A 75 AN 617 R332 448 RP102 C 114 DAN 5642 TL515 44-411 T200 ZE66 IP 174 AN 44 n 351 Caltrate L177 T 189 L77 RIFATER M E17 CL33 MP 658 BMS 6064 SZ 987 F 84 MYLAN G2 4895 E 749 G 1530