Hello Angela
I have been on SR Metformin for about 3 years now and last month asked the GP to prescribe the new 1g tablet which you are being prescribed. the 1g sr has only just come out this year. I used to take them one with breakfast and one with evening meal but because I am struggling with the side effects of the Byetta I have just switched to taking them both after my evening meal. They are a once a day tablet so should not matter when you take them except it should be at the same time each day. I am the same age as you (well 57 next week) and have been diagnosed for 4 years.
Hope you find the sr tablets an improvement - I have not had any trouble and I suffer with chronic irritable bowel! Bye for now, Jude