Hello, Medicines are commonly seen to cause metallic taste in mouth and there is a possibility that medicines are causing metallic taste. At times infection can also alter taste. Therefore metallic taste in mouth in your case seems to be a side effect of medication. You should consult an Oral Physician and get evaluated and in case if it is not the cause other causes like gum diseases, allergic rhinitis, nasal polyps, sinus infection, upper respiratory tract infection, acid reflux et cetera, can be ruled out and treatment of underlying cause will resolve the problem. As of now, you should gargle with a flavored mouthwash, chew sugar free chewing gums and drink plenty of water. Clean your tongue using a tongue cleaner. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Honey Arora