Hello You are taking METFORMIN for other illness besides diabetes ( according to your query). You are having frequent urination ( intense desire ), the possibilities may be, these include: 1 Diabetes uncontrolled diabetes may be the reason of such urination so get in blood sugar examination. 2 Tension or anxiety are the other reason of such symptoms . 3 Urinary tract infection may be the one such reason , so get in complete urine examination . I am also writing side effects of metformin, these are: Anorexia, nausea, diarrhea, vomiting, weight loss, flatulence , occasional metallic taste, weakness , hypoglycemia , rash, malbsorption of Vitamin B 12 , flusing palpitation, headache, indigestion , lightheadeness, abdominal discomfort, LACTIC ACIDOSIS in presence of renal failure & alcoholism. So frequent urination is not a side effect of metformin. Hope this will help you.