What if I take too much? An overdose of a large number of metformin tablets can cause serious health problems. The symptoms are severe and quick to appear. Eve: I went to take my metaformine at dinner time, and my daughter One extra dose may do nothing, metformin works on the liver not on the . You might suffer an upset stomach but otherwise shouldn't impact you too much. As you were prescribed with mg & you accidentally took 2, mg of Metformin about 20 minutes-1/2 hour ago, you just need to watch for. PCOS is a condition that affects how the ovaries work. Toxicology of oral antidiabetic medications. There are some medicines that interfere tkok the way metformin works. These are not all the side effects of metformin. If your kidneys are not working properly, your doctor will tell you to stop taking metformin. It'll normally be prescribed when other treatments, such as clomifene, have not worked. It is mg er.