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 P63 P75 K 40 AA 14 GG 531 523 logo G74 718 A 0.5 MP 50 Mini B M T PD 220 P97 ALG 263 Tiazac 120 L010 902 C 11 176 M1 G 3721 TYLENOL 160 3974 E 72 CombiPatch 0.05/0.14 mg per day par 028 A CJ W987 T010 VM A534 TPV 250 54 857 PBT logo and 524 M L L195 M N4