Having had lots of side effects from Metformin I have just been changed to Diamicron MR. I have a long history of ketonuria but this is possibly drug induced from other meds I take. Does anyone use a dual tester for both their BG and for ketones? If so, is there one that they recommend? Also what is a high level of Ketonuria? I should have mentioned that I have a history of this to my new GP but as he said the metformin worked on a different level I didn't think to mention it now I am a bit nervous about taking it especially if it is only elevated due to other meds. I am now really confused and wonder whether it is better just to go down the exercise and diet route especially since the GP says it goes with all my other meds and the blurb says it is contraindicated in three of the others I take.