One online resource for learning about the uses and side effects of the medication felodipine is MedlinePlus, a website from the U.S. National Library of Medicine. MedlinePlus provides reliable, up-to-date information about medications, treatments and the latest medical research.
Felodipine is a calcium channel blocker used to treat high blood pressure, also known as hypertension, according to MedlinePlus. The most common side effects of felodipine are headache, flushing, dizziness, rapid heartbeat and weakness. Other side effects are heartburn, constipation and enlarged gums tissue around teeth. Felodipine may also cause serious side effects that require immediate medical attention, including difficulty breathing, fainting, rash, and swelling of the face, arms or legs.