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 C282 BL 06 HP 227 logo and 4358 A92 GG 822 ONE A DAY and logo EP 120 EL barr 733 GS F1Y 325 73 MSB 001 LLORENS A CS VS 160 OR Surfak SCI 503 logo and 78 240 T 175 MACRODANTIN 100 mg U-S 250 SZ246 CFZ K 70 U28 AC 358 MYLAN 183 1072 10/500 E 18 E 4 cor 134 SG 109 G-DS-50 ML 42 44 352 GG 263 N P WW 62