What is cause and cure for Parageusia?

Parageusia is the medical term for a bad taste in the mouth.

One common form of parageusia is a metallic taste of food. This can be a side effect of several medications, such as acetazolamide, eszopiclone, metronidazole, or etoposide.

IN order to "cure" parageusia, one needs to find the source of the bad taste. Once discovered, stop eating or using what ever is causing the bad taste.