Diltiazem
Diltzac is a brand-name calcium channel blocker containing diltiazem as its active ingredient. It is primarily prescribed to manage hypertension, certain heart rhythm conditions, and angina (chest pain). By relaxing blood vessels and reducing the heart's workload, it helps improve blood flow and lower blood pressure.
Diltzac is a calcium channel blocker used to treat high blood pressure, angina, and certain heart rhythm disorders.
Key facts at a glance
- RxNorm
- 629300
- Generic
- Diltzac
- Class
- brand-name
- Brands
- —
- 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.
Diltzac is used to treat hypertension (high blood pressure), angina pectoris (chest pain), and certain cardiac arrhythmias such as atrial fibrillation. It may be prescribed when other blood pressure medications are not effective or tolerated.
As a calcium channel blocker, Diltzac inhibits calcium from entering smooth muscle cells lining blood vessel walls and the heart. This causes relaxation and widening of blood vessels (vasodilation), reduces the force of heart contractions, and slows electrical conduction through the heart, collectively lowering blood pressure and reducing cardiac oxygen demand.
This medication may cause dizziness, headache, or swelling in the ankles. Patients with certain heart conditions (like severe bradycardia or heart block) should use caution. Avoid grapefruit juice as it may increase drug levels. Do not stop taking this medication abruptly without medical supervision.
Official drug label
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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 July 26, 2026. · Read our editorial policy