teratoma. malignant teratoma. 1. a solid, malignant ovarian tumor resembling a dermoid cyst but composed of immature embryonal and/or extraembryonal elements derived from all three germ layers. 2. teratocarcinoma.
A: Metformin is an oral diabetes medication that helps control blood glucose (sugar) levels. It is used to treat type 2 diabetes, either alone or in combination with insulin or other medications. Common side effects include headache, weakness, mild nausea, vomiting, diarrhea, gas, and stomach pain.
Metformin can cause a side-effect called lactic acidosis, a buildup of lactic acid in the blood that is fatal in half of all cases. The label says it shouldn't be used by patients with kidney disease or by those taking heart medication.