Calcium channel blockers are medications used to lower blood pressure by slowing the movement of calcium into the cells of the heart and blood vessel walls. This makes it easier for the heart to pump and helps to widen blood vessels. There are two main types of calcium channel blockers: dihydropyridines and nondihydropyridines. Dihydropyridines primarily affect blood vessels, while nondihydropyridines also affect the heart's electrical activity. These medications can also be used to treat other conditions such as chest pain (angina), irregular heartbeats (arrhythmias), and migraines. Common side effects include dizziness, swelling in the legs, and fatigue. It's important to follow your doctor's instructions and not to stop taking the medication suddenly, as this can cause a spike in blood pressure or other complications. Always consult your doctor if you experience any troubling side effects or if you have conditions like liver disorders, low blood pressure, or are pregnant or breastfeeding.