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 WRF 4 A402 R3 BP 802 245 NL 791 4H2 T88 ZC17 logo and 1830 L132 0027 V L187 BP 321 GLYSET APR MP 46 Butrans 20mcg/hour 7154 ML 88 92 I 35 AR 102 512 par 211 M162 COUMADIN 3 T200 FL 1000 MG logo and 2780 RX679 ZOLOFT A96 SUPRAX 100 832 2 1/2 H23 TL388 IP 219 M V4