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Prazosin (By mouth)

Prazosin (PRAZ-oh-sin)

Treats high blood pressure. This medicine is an alpha-blocker.

Brand Name(s):

Minipress

There may be other brand names for this medicine.

When This Medicine Should Not Be Used:

You should not use this medicine if you have had an allergic reaction to prazosin or to similar medicines (such as doxazosin).

How to Use This Medicine:

Capsule

  • Take your medicine as directed. Your dose may need to be changed several times to find what works best for you.
  • Take this medicine at bedtime unless your doctor tells you otherwise.
  • Carefully follow your doctor's instructions about any special diet.

If a dose is missed:

  • Take a dose as soon as you remember. If it is almost time for your next dose, wait until then and take a regular dose. Do not take extra medicine to make up for a missed dose.

How to Store and Dispose of This Medicine:

  • Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light.
  • Ask your pharmacist, doctor, or health caregiver about the best way to dispose of any outdated medicine or medicine no longer needed.
  • Keep all medicine out of the reach of children. Never share your medicine with anyone.

Drugs and Foods to Avoid:

Ask your doctor or pharmacist before using any other medicine, including over-the-counter medicines, vitamins, and herbal products.

  • Make sure your doctor knows if you are also using diuretics or "water pills" (such as furosemide, hydrochlorothiazide, Aldactazide®, Aldactone®, Dyazide®, Hyzaar®, Lasix®, Lotrel®, Maxzide®, Moduretic®, Norvasc®, or Zestoretic®) or any other blood pressure medicine (such as atenolol, metoprolol, propranolol, Accupril®, Altace®, Calan®, Cardizem®, Cardura®, Covera®, Inderal®, Lotensin®, Lotrel®, Monopril®, Plendil®, Prinivil®, Tiazac®, Toprol®, Vasotec®, or Zestril®).
  • Do not drink alcohol while you are using this medicine.

Warnings While Using This Medicine:

  • Make sure your doctor knows if you are pregnant or breastfeeding, or if you have kidney disease.
  • Before you have eye surgery for a cataract (clouding of the eye), tell the ophthalmologist (eye doctor) that you are taking this medicine.
  • This medicine may make you dizzy or drowsy. Avoid driving, using machines, or doing anything else that could be dangerous if you are not alert.
  • If you stop using this medicine, your blood pressure may go up. High blood pressure usually has no symptoms. Even if you feel well, do not stop using the medicine without asking your doctor.
  • Tell any doctor or dentist who treats you that you are using this medicine. This medicine may affect certain medical test results.
  • Your doctor will check your progress and the effects of this medicine at regular visits. Keep all appointments.

Possible Side Effects While Using This Medicine:

Call your doctor right away if you notice any of these side effects:

  • Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing
  • Chest pain (may be related to your disease and not a side effect).
  • Fast, pounding, or uneven heartbeat.
  • Feeling of constant movement of self or surroundings.
  • Lightheadedness, dizziness, or fainting.
  • Shortness of breath or troubled breathing.
  • Swelling in your hands, ankles, or feet.

If you notice these less serious side effects, talk with your doctor:

  • Blurred vision.
  • Dry mouth.
  • Feeling sad, depressed, or nervous.
  • Headache.
  • Lack or loss of strength.
  • Nausea, vomiting, diarrhea, or constipation.
  • Rash.
  • Tiredness or weakness.
  • Weight gain.

If you notice other side effects that you think are caused by this medicine, tell your doctor

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088


Last Updated: 4/4/2014
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