A coated tongue can be caused by the blood being overly charged with toxins. The tongue's resistance and that of other fluids is thus lowered. The saliva can los its power to prevent the growth of micro-organisms; therefore, the mouth becomes a perfect incubating chamber in which bacteria and molds can grow. Medication can cause intestinal abnormalities. They can disrupt the homeostatic balance of your body, kill down the friendly floral and cause food to sit and putrefy. If I were you, I would do an intestinal cleans and give your self an enema once a day for about 4 days. Also, rebuild your friendly floral. I would use (amino acids) L-glutamine, L-arginine, and yogurt for this.