I take the same combination (metformin and Forxiga). I did get thrush in the first couple of weeks but that was because I thought it was a magic pill so I could eat more carbs! Lesson learnt, keeping the carbs low and making sure I drink plenty of water is working well. My BG used to be in the mid teens and now it’s in the 5s, 6s and occasionally 7s. I must admit taking the Forxiga keeps me from eating too many carbs as the thought of another bought of thrush isn’t pleasant. I don’t have any side effects now.