Hello, your description left me with a lot of questions. I ll give you the best answer I can given the lack of essential information. You mentioned that your father started antidiabetic tablets a couple of weeks ago and that he has fever whenever he takes them. Do you mean that he doesn t take them every day? Did he have fever every day for two weeks? Was he all right before that? Did he have any symptoms? Cough, runny nose, sore throat, abdominal pain, diarrhea, headache, flank pain, problems relating to urination etc? I do not believe that his fever is related to the tablets. If he s having fever for that long then he needs clinical evaluation and probably laboratory testing. I hope his health improves soon! Kind Regards!