Common side effects of Finacea Gel include application site reactions (burning, stinging, tingling, dryness, tightness, scaling, itching, redness, irritation), dizziness, headache, diarrhea, nausea, stomach pain, loss of appetite, constipation, changes in taste, furry tongue, and dry mouth.
Candida Overgrowth. Yes, sometimes people with Candida overgrowth experience a strong metallic bitter taste as a result of the toxins it emits. I have found that taking pantethine and molybdenum helped greatly with undesirable tastes in the mouth caused by candida. Hormone Imbalance.
If there is a coating on the tongue that suggests that there is a yeast overgrowth. Yeast (Candida) is an opportunistic infection and when the healthy gut bacteria has been disrupted then yeast can overtake residence in the digestive system. This is not limited to just the intestines and can also present on the tongue.