Terbinafine
"Took this med for toe fungus for 3 months. Fungus is gone but absolutely most horrible constant metallic taste in my mouth which makes me constantly swallow. On top of that it has definitely caused a loss in taste as flavors are dull and even spicy food seems bland. The worst part is that I finished the meds 2 months ago and I've not regained my taste, my appetite or gotten rid of the constant metallic taste in my mouth. I'm horrified to think it's permanent and I'll have to live with this side effect the rest of my life. NEVER would have taken this medication had I known it might cause this damage to my ability to enjoy food/life forever."