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It is used mainly to treat high blood pressure. It may also be used to treat heart failure, painful cold fingers (Raynaud’s disease) or mild enlargement of the prostate gland (prostatic hyperplasia) in men.

How it works

Prazosin belongs to a class of medications called alpha blockers. Prazosin works by relaxing blood vessels so that blood passes more easily through them  thereby decreasing the blood pressure. It also allows the heart to pump blood more easily.

Common side effects

Frequent and excessive erections of penis, Burning sensation, Itching, Chest pain, Decreased blood pressure, Shortness of breath, Fatigue, Weakness, Dizziness, Headache, Nausea, Altered heart rate


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Expert advice

  • The drug can cause dizziness, drowziness or nausea. Consult your doctor, if these side effects do not improve.
  • Take the drug with food or at bedtime to avoid side effects.
  • Check your blood pressure 1 week after starting this drug and consult your doctor, if it has not improved.
  • Do not drive or use any tools or machinery after taking prazosin.

Frequently asked questions


Q. What is minipress xl?
Minipress XL is a brand (proprietary) name of prazosin drug. Prazosin is an alpha blocker used in the treatment of high blood pressure (hypertension).
Q. Is prazosin an opiate, narcotic, benzodiazepine, or beta-blocker?
No. Prazosin is not narcotic. It doesn’t belong to opiate, benzodiazepine or beta blocker class. Prazosin is an alpha blocker used in the treatment of high blood pressure (hypertension).
Q. Is prazosin safe?
Prazosin is generally well tolerated. Self-medication is always harmful, so it should be used only under the guidance and recommendations of a doctor.
Q. Is prazosin addictive?
No. Prazosin does not have habit forming potential.

Content on this page was last updated on 28 September, 2016, by Dr. Varun Gupta (MD Pharmacology)