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 CL 72 573 54 922 ALKA SELTZER PLUS REGLAN 5 T011 BAYER BAYER B 683 V40 AP043 G74 APO 116 T D L 65 WATSON 796 E1 b 94 CTI 223 AN34 OXC 600 MP 43 PLIVA 470 D3 7154 CPC 2369 GLYNASE 1.5 SZ 787 PA09 V260 P291 M 7 M 745 1080 I73 ER 5 AN249 MCR 109 54 150 TYLENOL PM 44-503