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 1300 743 AN 511 S 493 KLX ML 22 logo and 067 M MT 720 1/2 GS LFG S551 266 5 300 AC40 CL47 LAMICTAL XR 300 L521 MYLAN 6725 TN 4 DAN 5642 CM MPC 500 320 Lofibra 134 mg GGN2 MYLAN 8015 Poly 782 L374 5 mg 5mg MP 50 PH 024 CTI 116 EGLT 15 ZESTRIL 40 BI 6 ABRS-123 ENTOCORT EC 3 mg AX4 HP 27 715