Amlodipine is a blood pressure medication used primarily to treat hypertension and certain types of chest pain caused by heart disease. It belongs to a class of drugs called calcium channel blockers, and it’s one of four drug classes recommended as a first-line treatment for high blood pressure by the American College of Cardiology and the American Heart Association in their 2025 guidelines. Most adults start at 5 mg once daily, with doses ranging from 2.5 to 10 mg depending on individual response.
Conditions Amlodipine Treats
Amlodipine has three approved uses, all related to the heart and blood vessels.
High blood pressure (hypertension). This is the most common reason people take amlodipine. Lowering blood pressure reduces the risk of strokes and heart attacks, which are the two most serious consequences of uncontrolled hypertension. Amlodipine can be used on its own or combined with other blood pressure medications.
Chronic stable angina. This is the predictable chest pain that occurs during physical exertion or stress, when the heart muscle doesn’t get enough blood flow. In clinical trials, amlodipine significantly reduced the number of angina episodes, improved total exercise time, and cut the need for nitroglycerin (a quick-relief medication for chest pain). These benefits lasted through the full 24-hour dosing period, which matters because the drug is taken only once a day.
Vasospastic angina. Sometimes called Prinzmetal’s angina, this type of chest pain happens when an artery supplying the heart temporarily spasms and narrows, often at rest rather than during exercise. Because amlodipine relaxes blood vessel walls, it’s effective at preventing these spasms.
For people with coronary artery disease confirmed by imaging, amlodipine also reduces the risk of hospitalization for angina and lowers the chance of needing procedures to restore blood flow to the heart.
How Amlodipine Works
Your blood vessels contain smooth muscle that contracts and relaxes to regulate blood flow. When calcium flows into these muscle cells through tiny channels, the muscle tightens, the blood vessel narrows, and blood pressure goes up. Amlodipine blocks those calcium channels, preventing the initial surge of calcium that triggers contraction. With less calcium entering the cells, the vessel walls relax, the vessels widen, and blood pressure drops.
This same relaxation effect is what makes amlodipine useful for angina. Wider blood vessels mean less resistance for the heart to pump against, so the heart doesn’t have to work as hard. In vasospastic angina specifically, blocking calcium entry prevents the abnormal spasm from occurring in the first place. Research also suggests amlodipine improves the function of the inner lining of blood vessels in people with hypertension, which contributes to better overall vascular health.
Typical Dosing
The standard starting dose for adults with high blood pressure is 5 mg taken once a day. Some people, particularly those who are older, smaller in build, or have liver problems, start at 2.5 mg. The maximum dose is 10 mg per day. Your prescriber will typically wait a week or two before adjusting the dose, since it takes time for the full blood pressure effect to develop.
People with liver conditions clear amlodipine more slowly, resulting in roughly 40 to 60 percent higher drug levels in the bloodstream compared to people with normal liver function. This is why a lower starting dose is standard for this group, and dose increases happen gradually.
Common Side Effects
The most frequently reported side effect is peripheral edema, which is swelling in the ankles, feet, or lower legs. This occurs in about 1 in 6 people taking amlodipine alone, and it’s more common in women than men. The swelling is dose-related, meaning it’s more likely at 10 mg than at 5 mg. It happens because the drug dilates blood vessels, which can allow fluid to shift into surrounding tissue, particularly in the lower extremities.
Other common side effects include dizziness, flushing (a warm or red feeling in the face or chest), and palpitations. These tend to be mild and often improve as your body adjusts to the medication over the first few weeks. Because amlodipine lowers blood pressure, standing up too quickly can sometimes cause lightheadedness, especially early in treatment.
Interaction With Cholesterol Medication
One important drug interaction worth knowing about involves simvastatin, a widely used cholesterol-lowering medication. When taken together with amlodipine, simvastatin levels in the body can rise enough to increase the risk of muscle injury. The FDA limits simvastatin to no more than 20 mg per day for anyone also taking amlodipine. If you’re on both medications, your prescriber may have already adjusted the simvastatin dose or switched you to a different cholesterol drug that doesn’t have this interaction.
Why It’s a First-Line Choice
Among blood pressure medications, amlodipine stands out for a few practical reasons. It works with a single daily dose, which makes it easier to take consistently. Its effects last a full 24 hours, so even if you take it a few hours late, you’re unlikely to lose protection. It doesn’t require routine blood tests for monitoring (unlike some other blood pressure drug classes that can affect kidney function or potassium levels). And it’s available as a low-cost generic, making it accessible to most patients.
The 2025 ACC/AHA hypertension guidelines place long-acting calcium channel blockers like amlodipine alongside three other drug classes as preferred initial therapy, supported by strong clinical trial evidence for both blood pressure reduction and prevention of cardiovascular events. For many people, amlodipine ends up being combined with one or two other medications from different classes to reach their blood pressure target.