Hi, Anti-fungal medications like Terbinafine can cause hair loss throughout the body. It can interfere the normal growth and texture of the hair. It can deplete your body s supply of certain B complex vitamins like biotin and niacin or cause a severe iron deficiency. B complex deficiency or iron deficiency causes hair loss. So, the best way to counteract these side effects is to start taking vitamin B or iron supplements under the advisement of your doctor. Most of the time, drugs like Terbinafine induced hair loss is reversible. A person s hair usually starts growing back a few months after they stop taking the medication. If stopping the drug doesn t improve hair thinning, you may need to be treated with finasteride or minoxidil, medications that slow hair loss and can stimulate new hair growth. Take care. Hope I have answered your questions. Let me know if I can assist you further. Regards, Dr. Zubayer Alam, General And Family Physician