Years ago when I was first put on Metformin I suffered nausea, stomach problems and dizziness. This was mainly in the mornings even though I took 2 x 500mg a day with food. The doctor then put me on slow release which seemed to sort things out. However I seem to be having problems again and I have noticed that quite often the pharmacy give me different brands with different size tablets. I know the specification and content of the tablets should always be the same and follow the same formula but it does set me thinking if this is causing the adverse effects! Does anyone else think the same?