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 M 13 233 and logo M365 2230 IP 193 L127 ELP 5 ZC45 PLETAL 50 logo and 97 logo and 174 Z198 ML 91 745 U23 2106 GG 134 GG 461 MYLAN 3125 H118 FL 14/10 93 7385 VH3 54 427 V356 4896 ZC 03 0397 M 147 UPSHER-SMITH 0101 GAVISCON ESR 1174 Advil C280 ZF 23 IB200 212 R 15 P75 981 logo and 20