onychomycosis, toenail
"After two months of taking this medicine I suddenly developed a terrible oily, metallic taste in my mouth.  It is constant and dampens the taste of all foods and drinks. After I eat I have a greasy feeling on my tongue.  I stopped taking the medicine because of the side effects.  I didn't realize before how common this side effect is or I would not have taken this medicine.  I hope my sense of taste returns quickly.  I feel like I poisoned myself."