I been on slow release metformin 1000mg twice a day but for best part of 3 years has really bad gut and gas problems Dr said not metformin Nurse said not metformin fast forward nearly 3 years new doctors spoke to him and straight away its metformin I am on Linagliptin 5mg and Dapagliflozin 10mg now he took me off metformin and Dapagliflozin and replaced with Canagliflozin 100mg to start with is it better than metformin.