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 bull symbol 51 30 LI 5 W 782 AUGMENTIN G V 50 PC16 A05 EP 117 K4 4214 SYPRINE K 101 .7 WW 173 783 F 2 P P 0397 44 194 logo and LANNETT CL92 PVK 250 ML GG854 GG854 LAMICTAL 100 NEORAL 100mg M 42 029 M 138 20 L424 MOD 200 21 G AHI logo and 15 or 20 E 213 3613 IL 1118