It is a misconception. Allopathic drugs which are permitted to be used for a long time do not have any side effects. It is only certain drugs which are used in emergencies have side effects. Ayurveda is based mainly on Pathya, i.e Diet and does not show cure to Diabetes. Till date there aren't any promises to cure Diabetes from Ayurveda, but Allopathy can maintain it. So, start on medications and protect yourself from damages.