<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi Doctor.. I wanted to know the side effects of Istamet 50mg500 mg tablets for diabetes? My mom has sugar and she has takes these tablets and she feels very low on energy after taking this and Tri Glynase 2 Forte... What can be the reason for this? Her sugar tests are good and in control...  <response>: Hi, Stamen 50 mg500 mg is a combination of two medicines sitagliptin 50 mg and metformin 500 mg commonly prescribed to control blood sugar in type 2 diabetic patients. Its common side effects include vomiting, abdominal cramps, diarrhea, metallic taste, low blood sugar levels and a serious complication lactic acidosis metformin-induced. Based on the history given your mom seems to have developed a very low blood sugar level apparently caused by taking stamen 50500 along with triglynase 2 forte together. She needs a dose adjustment of the prescribed medications by her treating doctor and frequent monitoring of blood sugar to safely use both medications. Hope I have answered your query. Let me know if I can assist you further. Take care 