Isoptin SR , known as verapamil, is a calcium channel blocking agent used to treat high blood pressure or angina (chest pain). It works by affecting the movement of calcium into the heart cells and blood vessels, so the blood vessels are relaxed and the blood flows more easily and smoothly.
It is available as a controlled release tablet that is taken orally. The dose of Isoptin SR varies depending on the patients symptoms.
Common side effects of Isoptin SR are lightheadedness, drowsiness, headache, dizziness, fatigue, upset stomach, nausea, increased appetite and weight gain.
Isoptin SR may also be prescribed for other illnesses, as determined by your doctor.