Been taking Janumet after breakfast and Metformin after dinner for three years. Together with one-hour daily walk my weight reduced from 75 kg to healthier 68 kg. (I am 5ft 9in.) But since a few days my weight has started increasing (69.6 kg today morning). Is prolonged use harmful? My sugar level varies from 120 to 165 in mornings or 2-3 hours after meals.