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 logo and 0495 M 1860 DROXIA 6336 Z330 30 mg GG855 HE MAX TCL341 ZA-37 440 WRF 10 PA 917 b 572 EL 14 WATSON 411 PLIVA 397 B 312 2 56 135 3QD A85 1/4 L657 371 Z 2089 539 G455 GS LHF 75 mg S 226 P 1 ONE A DAY and logo P97 IP 178 OME 40 logo and 123 ibr 70 mg L 2 C C N 50 2 55 573