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 M 722 BL 60 S552 H568 logo and 069 C1 or C2 or C3 or P 93 3165 BNP 7600 logo and 52 738 M 93 G 220 NORTRIPTYLINE K 111 V209 6 mg C 116 Advil A&CR SG BERTEK 670 WPI 6 X08 G 035 MYLAN GT 16 M D10 I26 RIFATER A534 A973 150 XL RX904 L158 A300 SZ 210 MG1 YS 01 N T4 USL 8 GLUCOTROL XL 5 VP302