Doxazosin is an alpha blocker medication that treats high blood pressure and benign prostatic hyperplasia. This medication comes as a tablet that you can take by mouth as directed. The brand name of doxazosin is Cardura®.
DOXAZOSIN (dox AY zoe sin) treats high blood pressure. It may also be used to treat symptoms of an enlarged prostate (benign prostatic hyperplasia). It works by relaxing blood vessels, which decreases the amount of work the heart has to do. It also relaxes the muscles in the prostate and bladder, which makes it easier to urinate. It belongs to a group of medications called alpha blockers.
This medicine may be used for other purposes; ask your health care provider or pharmacist if you have questions.
COMMON BRAND NAME(S): Cardura
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They need to know if you have any of the following conditions:
Take this medication by mouth. Take it as directed on the prescription label at the same time every day. You can take it with or without food. If it upsets your stomach, take it with food. Keep taking it unless your care team tells you to stop.
Talk to your care team about the use of this medication in children. Special care may be needed.
Overdosage: If you think you have taken too much of this medicine contact a poison control center or emergency room at once.
NOTE: This medicine is only for you. Do not share this medicine with others.
If you miss a dose, take it as soon as you can. If it is almost time for your next dose, take only that dose. Do not take double or extra doses.
This medication may interact with the following:
This list may not describe all possible interactions. Give your health care provider a list of all the medicines, herbs, non-prescription drugs, or dietary supplements you use. Also tell them if you smoke, drink alcohol, or use illegal drugs. Some items may interact with your medicine.
Visit your care team for regular checks on your progress. Check your blood pressure regularly. Ask your care team what your blood pressure should be and when you should contact them.
Drowsiness and dizziness are more likely to occur after the first dose, after an increase in dose, or during hot weather or exercise. These effects can decrease once your body adjusts to this medication. Do not drive, use machinery, or do anything that needs mental alertness until you know how this medication affects you. Do not stand or sit up quickly, especially if you are an older patient. This reduces the risk of dizzy or fainting spells. Alcohol can make you more drowsy and dizzy. Avoid alcoholic drinks.
Do not treat yourself for coughs, colds, or pain while you are taking this medication without asking your care team for advice. Some ingredients may increase your blood pressure.
Your mouth may get dry. Chewing sugarless gum or sucking hard candy, and drinking plenty of water may help. Contact your care team if the problem does not go away or is severe.
If you are going to have eye surgery for cataracts, tell your care team you are taking this medication. A condition called Intraoperative Floppy Iris Syndrome (IFIS) can happen if you have taken this medication.
For males, contact your care team right away if you have an erection that lasts longer than 4 hours or if it becomes painful. This may be a sign of a serious problem and must be treated right away to prevent permanent damage.
Side effects that you should report to your care team as soon as possible:
Side effects that usually do not require medical attention (report to your care team if they continue or are bothersome):
This list may not describe all possible side effects. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
Keep out of the reach of children and pets.
Store at room temperature between 15 and 30 degrees C (59 and 86 degrees F). Throw away any unused medication after the expiration date.
NOTE: This sheet is a summary. It may not cover all possible information. If you have questions about this medicine, talk to your doctor, pharmacist, or health care provider.
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Note: Introduction and Frequently Asked Questions written and medically approved by Cleveland Clinic professionals.