I have had coated tongue and dry mouth for 3. 5 months. Now mainly dry mouth. Have ruled out gastro , ear nose and throat and blood work and urine samples pretty normal as was ultrasound. Trying dry mouth mouthwash tooth paste and lozenges. Very temporary relief. Never had this problem before. Had bypass 9 years ago and am on beta blocker and atacand and Crestor . Maybe drug related but same drugs for 9 years did not cause it. Anyone have any ideas.