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 MYLAN 145 SI 259 PA09 136 638 Nitro-Dur 0.1 mg/hr WATSON 796 V356 131 ZF 42 231 and logo AMOX 250 WATSON 3209 300 mg 1140 LL logo and 2666 Climara 0.0375mg/day EV0093 04 31 Niraparib alza 27 TV 5655 G 421 ARI 15 U37 IG273 792 2 0 9 0 MYLAN 6410 93 3165 40 7U0 745 2 11 681 Lilly 3229 F200 T D