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 B M T W 922 APTALIS 15 1181 M PD1 G23 LCE 100 DSC L60 250mg HYPROST PARNATE SB L187 U APTALIS 5 logo and 160 5972 V logo 136 APTALIS 3 WPI 3331 T88 WFHC 93 900 CMC 176 Y 16 Z48 99 AZ 267 2.5 L195 LE 500 ABRS-123 A 100 VPHEME RTG-200 IP 253 629 B911 WELLBUTRIN 75 BAYER M112