Cimetidine may cause an increase in the blood level ofmetformin. Your doctor may reduce your metformin dose if you take bothmedicines.

Metformin should be stopped before X-ray examinations involvinginjections of iodinated contrast materials, as these may cause a temporarydecrease in kidney function that could affect the blood level of metformin.Metformin should not be started again after the X-ray until kidney function hasbeen tested and found to be normal.

A drop in the number of blood cells called platelets in the blood has been seen in some people taking the antihistamine ketotifen in combination with metformin. The manufacturer of ketotifen recommends that it should be avoided in people taking metformin.

Other medicines containing the same active ingredient
Bolamyn SR  Metsol  

Metformin standard release tablets and liquid are also availablewithout a brand name, ie as thegeneric medicine.