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 PreQue m B 45 78 Targretin AN 543 669 SL 125 93 27 LLORENS R428 RDY 663 2089 V AB1 C25 AA 99 TV 6 A CL B056 100 T538 P620 E 101 0632 75mg PAD 93 5296 V41 L067 H 603 K 71 S407 54 647 S 6 T 19 M 138 logo and 343 140 mg logo 1113 ATON 705 N20 60 mg