Felodipine extended-release (ER) tablets are a calcium channel blocker used to treat high blood pressure (hypertension). It works by relaxing and widening blood vessels, which helps lower blood pressure and improve blood flow. As an extended-release formulation, felodipine provides a gradual and sustained effect throughout the day, reducing the risk of blood pressure spikes. This medication can help lower the risk of heart attacks, strokes, and kidney problems associated with hypertension.