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 S 493 1/2 NORPRAMIN 150 logo and 807 23 25 W122 UPSHER-SMITH 0227 CI GG 51 IP 190 G 30 GG 623 LL713 CLL logo and 342 10 or 20 or 40 URETRON D/S A 101 V 200 CYP 190 44-526 126 A 04 FOSTEUM PLUS logo and 57 54 591 PR MYLAN DE 30 672 CB7 M 59 S4 JSP 544 299 M A20 SUPRAX 200 RP125 TV U4 W964 LILLY 4112