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 WW 66 A85 PRECOSE 100 riba 200 PREMPRO 0.625/5 or PREMARIN 0.625 832 TEVA 2049 AMA RYL CL 44 S408 I 37 HLP 80 LL S 5 APTALIS 15 1300 232 L852 D12 ANI 511 M31 E 64 logo and LANNETT GG 334 barr 5 mg logo and 23 ALG 263 M 84 1423 T D 17 345 M 127 logo and 509 HP 46 POML 364 44 450 E 801 1067