Prazosin is used to treat hypertension (high blood pressure). Lowering blood pressure may lower your risk of a stroke or heart attack.
Prazosin may also be used for other purposes not listed in this medication guide.
uses
What is Prazosin (Minipress) used for?
- Hypertension
- Pre-eclampsia/Eclampsia
- Cardiovascular Disease
- Hypertensive Congestive Heart Failure
- Hypertensive Heart (w/ CHF) and Renal Disease
- Hypertensive Heart (w/o CHF) and Renal Disease
- Hypertensive Renal Disease
- Hypertensive Retinopathy
- Renovascular Hypertension
- Hypertensive Encephalopathy
- Hypertensive Heart Disease
warnings
What is the most important information I should know about Prazosin (Minipress)?
You should not use prazosin if you are allergic to it.
Tell your doctor if you have ever had:
- low blood pressure, especially if caused by taking medications.
Prazosin can affect your pupils. If you have cataract surgery, tell your surgeon ahead of time that you use this medicine.
Tell your doctor if you are pregnant or plan to become pregnant. It is not known whether prazosin will harm an unborn baby. However, having high blood pressure during pregnancy may cause complications such as diabetes or eclampsia (dangerously high blood pressure that can lead to medical problems in both mother and baby). The benefit of treating hypertension may outweigh any risks to the baby.
It may not be safe to breastfeed while using this medicine. Ask your doctor about any risk.
Prazosin is not approved for use by anyone younger than 18 years old.
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Side Effects
What are the side effects of Prazosin (Minipress)?
Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
- a light-headed feeling, like you might pass out;
- pounding heartbeats or fluttering in your chest;
- new or worsening chest pain; or
- upper stomach pain, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes).
Call your doctor or seek emergency medical attention if your erection is painful or lasts longer than 4 hours. A prolonged erection (priapism) can damage the penis.
Common side effects may include:
- dizziness, drowsiness;
- headache;
- feeling weak or tired; or
- nausea.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
Pregnancy & Breastfeeding
Can I take Prazosin (Minipress) if I’m pregnant or breastfeeding?
Tell your doctor if you are pregnant or plan to become pregnant. It is not known whether prazosin will harm an unborn baby. However, having high blood pressure during pregnancy may cause complications such as diabetes or eclampsia (dangerously high blood pressure that can lead to medical problems in both mother and baby). The benefit of treating hypertension may outweigh any risks to the baby.
It may not be safe to breastfeed while using this medicine. Ask your doctor about any risk.
Interactions
What drugs and food should I avoid while taking Prazosin (Minipress)?
Avoid driving or hazardous activity until you know how this medicine will affect you. Your reactions could be impaired.
Avoid getting up too fast from a sitting or lying position, or you may feel dizzy.
Drinking alcohol with this medicine can cause side effects.
Dosage Guidelines & Tips
How to take Prazosin (Minipress)?
Use Prazosin (Minipress) exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended.
Follow all directions on your prescription label and read all medication guides or instruction sheets. Your doctor may occasionally change your dose. Use the medicine exactly as directed.
Prazosin lowers blood pressure and may cause dizziness or fainting, especially when you first start taking it, or whenever your dose is changed. You may feel very dizzy when you first wake up.
Your blood pressure will need to be checked often.
Swallow the capsule whole and do not crush, chew, break, or open it.
Keep using this medicine as directed, even if you feel well. High blood pressure often has no symptoms. You may need to use blood pressure medication for the rest of your life.
Prazosin is only part of a complete treatment program that may also include diet, exercise, weight control, and special medical care. Follow your doctor's instructions very closely.
Some things can cause your blood pressure to get too low. This includes vomiting, diarrhea, or heavy sweating. Call your doctor if you are sick with vomiting or diarrhea.
Store at room temperature away from moisture and heat.
Take the medicine as soon as you can, but skip the missed dose if it is almost time for your next dose. Do not take two doses at one time.
Overdose Signs
What happens if I overdose on Prazosin (Minipress)?
Overdose symptoms may include extreme drowsiness or underactive reflexes.
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Images
MINIPRESS, PFIZER 431
Color: white
Shape: capsule
Imprint: MINIPRESS, PFIZER 431
MINIPRESS, PFIZER 437
Color: pink/white
Shape: capsule
Imprint: MINIPRESS, PFIZER 437
MINIPRESS, PFIZER 438
Color: blue/white
Shape: capsule
Imprint: MINIPRESS, PFIZER 438