Pill Identification by Imprints: A538 Home Pill Identification by Imprints: A538 2 results GUANFACINE HCL ER 4 MG TABLET Side 1: A538 Color: Blue Side 2: 4 mg Shape: Oblong GUANFACINE HCL ER 4 MG TABLET Side 1: A538 Color: Blue Side 2: 4 mg Shape: Oblong Other Popular Drug Imprint PH 043 BP 802 T29 ap and logo 550 logo and 341 G&W 0555 1159 37 44 L130 MIDOL PM A257 RSV 10 ZC41 MYLAN 2046 par 727 STO 75 MP 8 GG 55 BL 01 OMJ 200 010 SANDOZ 625 NORCO 539 R 100 93 7350 nGL 38AV LAMICTAL 25 LCI 1337 C83 PA4 FL 28/10 L430 1307 CR 500 A44 BL 302 AMOXIL 875 WW 27 RI20