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 F 27 GG 438 P 150 TARO PHN 100 E1 5225 200 S551 M P4 RJ73 YH 018 L 178 17 NORPRAMIN 100 5904 V Andrx 698 AP 84 A my CREON 1212 B 073 logo IDL 75 252 or 302 US 13 U13 Q22 G41 FL 14/10 93/11 logo and 341 270/80 WPI 3508 604 EP 118 N 83 PREMARIN 0.3 422 GG 338 1182 RD74 IG272