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 BL 05 A100 GG 108 LU E01 ML 61 Advil 100 RD 71 3571 V W 923 GG 124 L114 FENTANYL 200 ANI 230 T538 TCL 272 M 060 TL 172 ZE 43 WC 402 B105 C C+C POLY 783 2532 676 MYLAN 3075 P 3 I84 AS 400 m 100 Climara (estradiol) 0.05mg/day HP 11 93 3193 93 2929 NL 712 595 A50 54 328 HYD 100 BI 11 DAN 5555