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 P 242 logo and 123 AK2 804 ZC 79 P0.5 BRX 0.25 678 GG 168 MP 444 NEXIUM 20mg EGLT 15 HP 26 894 G 300 mg PROCARDIA XL 90 110 D 94 P 657 M 412 MYLAN 5150 383 A CJ LCI 1338 SZ 659 I 1 logo and 658 logo and 4358 G00 176 EP 118 PLIVA 325 E 132 ML 59 ALG 263 logo 751 ARI 20 E 70 M L19 CL 205