👉 Phenformin is a prescription drug that is used to treat several conditions, including muscle pain and inflammation. It works by blocking a protein called P-glycoprotein, which in turn reduces the levels of a specific hormone, prostaglandin E2, in the bloodstream. This helps to reduce inflammation and muscle pain associated with certain conditions. The exact mechanism of action and side effects of phenformin may vary from person to person based on factors such as individual sensitivity to the drug and