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 CYP 161 210 2985 ZC 07 93 7300 PEPCID T598 MYLAN AC I 02 logo and 511 APO ZIP 538 S 900 ZA-18 54 706 OP150 par 219 M D54 976 NQ logo 222 435 717 ZC 67 S G M 36 455 m 100 K 100 DANTRIUM 50mg LAMICTAL 150 138 93 900 W 922 SOMA MT1 HP 1 MAXIPHEN BACTRIM 0 8 N030