Diltiazem is a calcium channel blocker used to treat hypertension and certain types of angina. It works by inhibiting the influx of calcium ions into vascular smooth muscle and cardiac cells. This inhibition leads to relaxation of arterial walls, decreasing peripheral resistance and lowering blood pressure. It also slows the rate of electrical conduction through the atrioventricular node, which helps control heart rhythm. The combined vascular and cardiac effects reduce the workload of the heart and improve oxygen delivery to tissues. Clinical use of Diltiazem is therefore aimed at managing high blood pressure and alleviating chest pain associated with coronary artery disease.

Diltiazem is a medication used to treat certain heart rhythm problems and to lower blood pressure. It belongs to a class of drugs known as calcium channel blockers that work by relaxing blood vessels and reducing the heart's workload. By blocking the flow of calcium into heart muscle cells, it slows the heart rate and improves the ability of the heart to pump blood. The drug also helps to prevent episodes of angina by increasing blood flow to the heart. Its effects are achieved through selective inhibition of the l-type calcium channels in vascular smooth muscle and cardiac tissue. This leads to a modest reduction in systolic and diastolic blood pressure and a stable heart rhythm. Because it targets calcium channels, Diltiazem is effective for both hypertension and certain arrhythmias without directly affecting other electrolytes.

Diltiazem may cause dizziness which can be more noticeable when standing up quickly. Headache is another frequently reported symptom that usually resolves without intervention. Some people experience fatigue or a general feeling of low energy. Nausea or mild stomach discomfort can occur, especially during the first few days of treatment. Peripheral edema such as swelling of the ankles or feet may develop due to fluid retention. Constipation is reported in a minority of patients and tends to be mild. In rare cases a slow heart rate or heart block can be observed, particularly in individuals with existing conduction issues.

Diltiazem may cause mild dizziness or light headedness. Some people experience swelling of the ankles or feet. Headache can occur as a frequent complaint. Flushing or a warm sensation in the skin is possible. Nausea or mild stomach discomfort may be reported. Fatigue or unusual tiredness can happen. Low blood pressure may lead to faintness upon standing. Constipation or changes in bowel habits are occasionally observed.