Diltiazem Hydrochloride
Diltiazem Hydrochloride is a calcium channel blocker used to treat hypertension (high blood pressure), certain heart rhythm disorders (such as atrial fibrillation or atrial flutter), and chronic stable angina. It works by relaxing blood vessels and reducing the heart's workload, allowing blood to flow more easily and decreasing oxygen demand on the heart.
A calcium channel blocker that treats high blood pressure, heart rhythm disorders, and angina by relaxing blood vessels and reducing heart workload.
Key facts at a glance
- RxNorm
- 203211
- Generic
- Diltiazem Hydrochloride
- Class
- pin-variant
- Brands
- Matzim, Tiadylt, Cardizem, Tiazac, Taztia, Cartia, Dilt, Diltzac
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- —
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Treatment of hypertension, chronic stable angina, and heart rhythm disorders including paroxysmal supraventricular tachycardia (PSVT) and atrial fibrillation/flutter.
Blocks calcium channels in cardiac muscle and vascular smooth muscle, causing relaxation of coronary and peripheral arteries, decreased heart rate, and reduced cardiac contractility.
Do not stop taking abruptly without medical supervision. Grapefruit juice may increase drug levels. Inform your doctor of all medications, especially beta-blockers, digoxin, or amiodarone. May cause dizziness; avoid alcohol. Contraindicated in patients with sick sinus syndrome, severe bradycardia, or heart block without a pacemaker.
Official drug label
WellAlly may earn a referral fee from linked resources at no extra cost to you. Editorial content is never influenced by commercial relationships.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy