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 0397 232 and logo L 5 1326 SCU 54 775 KU 107 1201 M522 292 MYLAN TM 250 NL 771 IX524 5410 ER 253 717 X502 EZEM P0 02 RE 75 RES200 DDS 081 logo and 5712 93 7386 A05 P10 b 572 Mucinex NT or EP or E RX124 WATSON 3551 logo and 35 PE 669 4810 ND2 MYLAN 5280 L 348 801 M 84