Nifedipine is primarily used in the treatment of high blood pressure (hypertension) and certain types of chest pain (angina). By relaxing the blood vessels, it helps to lower blood pressure and improve blood flow to the heart, reducing the workload on the heart and alleviating chest pain. It is often prescribed for chronic stable angina and vasospastic angina, where it prevents the narrowing of blood vessels. Additionally, nifedipine is sometimes used off-label to manage conditions like Raynaud's phenomenon, where it helps to improve blood circulation in the fingers and toes. It is available in immediate-release and extended-release forms, with the latter being more commonly used for long-term management of hypertension. Patients are typically advised to avoid grapefruit products while taking nifedipine, as they can interfere with its effectiveness.