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 ML 94 KEY 74 logo and 15 or 20 671 AS+ D 2232 WPI 100 M450 L553 b 94 logo and 200 N4 ICAPS N 11 402 MAXINATE M 530 HYDREA 830 12.5 BARRIER M 63 052 L 66 TL574 ZC 08 logo and D2 1000M West- ward P11 LEVAQUIN ZYVOX 600 mg 3205 595 ZYNOVA 01 7U0 AA250 V 4172 PZ 180 GG 771 logo and 144 logo YF