Tiazac
Tiazac is a brand-name calcium channel blocker containing diltiazem as its active ingredient. It is primarily prescribed to manage high blood pressure, relieve chest pain (angina), and control certain heart rhythm disorders. By relaxing blood vessels and reducing the heart's workload, Tiazac helps improve blood flow and decrease blood pressure.
Tiazac is a calcium channel blocker used to treat high blood pressure, angina, and certain heart rhythm conditions.
Key facts at a glance
- RxNorm
- 220309
- Generic
- Tiazac
- 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.
Tiazac is used to treat hypertension (high blood pressure), chronic stable angina, and may be prescribed for certain types of arrhythmias (abnormal heart rhythms). It is typically considered when lifestyle modifications alone are insufficient for blood pressure control.
Tiazac contains diltiazem, a calcium channel blocker that works by preventing calcium from entering the smooth muscle cells of blood vessels and the heart. This causes the blood vessels to relax and widen (vasodilation), reduces the heart's workload, and decreases oxygen demand by the heart muscle.
Tiazac should be taken exactly as prescribed by a healthcare provider. Common side effects may include dizziness, headache, flushing, and swelling in the ankles. Patients should not stop taking Tiazac abruptly, as this may worsen their condition. Those with certain heart conditions, liver problems, or who are pregnant should discuss risks with their doctor before use.
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 August 25, 2026. · Read our editorial policy