Amlodipine
Amlodipine is a long-acting dihydropyridine calcium channel blocker. It blocks calcium entry into the smooth muscle of arterial walls, which relaxes them and lowers the resistance the heart pumps against. It is prescribed for high blood pressure and for angina, where the same widening of coronary arteries improves blood supply to the heart muscle.
It can be taken with or without food, usually in the morning, and its long action means blood pressure stays covered across the day. Grapefruit is avoided because it blocks the enzyme that clears amlodipine, raising blood levels. Combined with simvastatin it pushes statin levels up too, so prescribers cap the simvastatin dose — a combination worth naming at every pharmacy visit. Swelling of the ankles is a known effect of the widened vessels rather than a sign of heart failure, and kidney function is followed through creatinine and eGFR.
Fainting, a very slow or racing heartbeat, chest pain that is new, more frequent, or worse than usual, or swelling that spreads upward or comes with breathlessness all mean see a doctor. Unexplained muscle pain or weakness while also on a statin should be reported promptly.
Reference information, not medical advice. Discuss any change with your doctor.