What is the most serious side effect of metformin?

The most serious side effect of Metformin Hcl 500 Mg is lactic acidosis. While rare, this potentially life-threatening condition can occur when metformin builds up in the bloodstream, leading to excessive levels of lactic acid. Symptoms of lactic acidosis may include weakness, severe fatigue, slow or irregular heartbeats, muscle pain, trouble breathing, stomach discomfort, and lightheadedness. Prompt medical attention is crucial if these symptoms arise. However, it's essential to note that the risk of lactic acidosis from Metformin Hydrochloride 500 Mg is relatively low, especially when the medication is used appropriately and monitored by healthcare professionals, making it a generally safe and effective treatment for type 2 diabetes.