Diltiazem — Uses, Dosage, Side Effects & Safety

Drug class: Calcium channel blocker (non-dihydropyridine)

Overview

Diltiazem is a prescription medication used to treat high blood pressure (hypertension), certain types of chest pain (angina), and some heart rhythm disorders such as atrial fibrillation and atrial flutter . By relaxing the muscles of your heart and blood vessels, diltiazem helps lower blood pressure and reduce the heart's workload, making it easier for the heart to pump blood . Diltiazem works by blocking calcium from entering the cells of the heart and blood vessel walls. This action helps to widen (dilate) blood vessels, improve blood flow, and control heart rate . It is important to take diltiazem exactly as prescribed and not to stop it suddenly without consulting your healthcare provider. Key points: Diltiazem may be used alone or with other medications. Regular monitoring of blood pressure and heart rate is important while on this medication. Always inform your doctor about all other medicines you are taking, as diltiazem can interact with several drugs.

Therapeutic uses

• Hypertension
• Angina
• Atrial fibrillation

Common side effects

• Headache
• Dizziness
• Edema (swelling)
• Bradycardia (slow heart rate)
• Nausea
• Constipation
• Hypotension (low blood pressure)
• Heart failure

Frequently Asked Questions about Diltiazem

What conditions does diltiazem treat?

Diltiazem is used to treat high blood pressure, angina (chest pain), and certain heart rhythm disorders such as atrial fibrillation and atrial flutter .

How long does it take for diltiazem to work?

Diltiazem starts to lower blood pressure and heart rate within a few hours of the first dose, but full effects may take several days. For angina, symptom relief may be noticed within hours .

Can I drink alcohol while taking diltiazem?

It is best to avoid alcohol while taking diltiazem, as it can increase the risk of side effects such as dizziness and low blood pressure .

What should I do if I miss a dose?

Take the missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose. Do not take two doses at once .

Are there foods or drinks I should avoid?

Avoid grapefruit and grapefruit juice, as they can increase diltiazem levels in your blood and raise the risk of side effects .

Is diltiazem safe during pregnancy or breastfeeding?

Diltiazem should only be used during pregnancy if clearly needed. It passes into breast milk, so discuss risks and benefits with your doctor if you are breastfeeding .

Can diltiazem be taken with other blood pressure medications?

Diltiazem is sometimes used with other blood pressure medicines, but combinations must be monitored closely due to the risk of low blood pressure or slow heart rate .

Educational information only. Always consult a qualified healthcare professional before starting, stopping, or changing any medication.