The evidence of the effects of Metformin beyond blood glucose control is now strong. Many existing medications are being investigated for repurposing, including exenatide for its neuro-protective properties for people with Parkinson’s Disease. That research is also positive. Of course, you are under no obligation to take any medication, whether for its original or repurposed use. All medications have possible side effects and if side effects are a problem then perhaps the medication is not for you. Others may not get any side effects and may be able to benefit from original and repurposed benefits.