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 143 ZGNX 20 mg DYRENIUM 50 mg A 17 A 50 CEP P 657 TCL 080 L201 ZD 14 M 313 785 7155 VALPROIC 250 L147 CL17 W 1034 TCL347 AA250 353 BUMEX 0.5 WW 176 AHI 4 LAMICTAL 25 ML 041 VP010 5011 V LAMISIL Ziks631 M A5 10 mg and 3513 PARLODEL 2 1/2 N 100 ED 400 SUN808 U02 C 5 I S592 E 10