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 TN 4 TL518 IP 212 CL 025 MP 66 logo and 2909 SAT W 925 PIO WATSON 780 667 mg STI 022 logo and 750-20 L485 WPI 3635 E 12 F20 100 MYLAN 257 60274 P 5 832 BC20 ABRS-123 CY ACTIQ 1200 GGD7 G 6 IMITREX 100 BI BI 2 57 BCL 10 D2 IDT M60 54 145 B198 RD05 2103 V rfx logo 111 L486 CREON 1203