Prazosin
Minipress (prazosin) is a prescription alpha-1 adrenergic blocking agent used primarily to treat high blood pressure (hypertension). It works by relaxing and widening blood vessels, making it easier for the heart to pump blood through the body. This medication is typically used when other blood pressure medications have not been effective.
Minipress is a blood pressure medication that relaxes blood vessels by blocking alpha-1 receptors, helping reduce hypertension.
Key facts at a glance
- RxNorm
- 71515
- Generic
- Minipress
- 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.
Minipress is primarily prescribed to treat high blood pressure (hypertension). It may also be used to improve blood flow in conditions like Raynaud's phenomenon or to help with urinary symptoms associated with benign prostatic hyperplasia (BPH) in some cases.
Minipress belongs to a class of drugs called alpha-1 blockers. It works by blocking alpha-1 adrenergic receptors in the walls of blood vessels, preventing the action of certain natural chemicals that constrict blood vessels. This causes the muscles in the vessel walls to relax, allowing blood vessels to dilate and blood to flow more easily, thereby lowering blood pressure.
A notable side effect is the 'first-dose phenomenon,' where dizziness or fainting may occur with the initial dose or when the dose is increased. Patients should take the first dose at bedtime and rise slowly from sitting or lying positions. Other common side effects may include headache, drowsiness, and fluid retention. This medication may interact with other blood pressure drugs, particularly other alpha blockers and erectile dysfunction medications, potentially causing severe hypotension. Patients should inform their doctor of all medications and supplements they are taking before starting Minipress.
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