Does toenail fungus ordinate in the stomach ? All so, is it useless then to use other products that are used on the toenail alone. My doctor has proscribed for me the medicineTerbinafine ,to use one week on and tree off. He had me take a blood test on my request because my iron was done but every thing is ok there. I here Terbinafine can really hurt your liver if your not care full. I m 76 and am in good shape, I work out with weights but not over doing it, ii. I m 5-8, 145 lbs ,but feel real good. Should I take a chance on the above medicine. Tom