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dox ay' zoe sin

Brand names with manufacturer

Cardura XL
Doxadura XL


Prescription drug

What is it

Doxazosin belongs to that category of drugs known as alpha-blockers. It is capable of relaxing blood vessels as well as the muscles of the prostate and bladder.



Doxazosin is used for the treatment of hypertension (high blood pressure) and benign prostatic hyperplasia (BPH).


The drug can also be used to get rid of, kidney stones through urination. In women, it may also be used to treat problems of the urinary bladder.

What should I know before taking this drug:

You should know the dosage, side effects and precautions before taking the drug

How to take it

Make sure you read the patient information manual that comes along with the packet. It comes in the form of tablet and is taken by mouth with or without food and as directed by doctor.

It’s also available as modified release tablets which release the drug throughout the day to   produce a uniform effect on the body. The extended release tablet is usually taken once a day with breakfast. Do not discontinue taking the drug without consulting your doctor.

Try not to alter the timings of the medicines every day in order to avoid missing the dose.

Adverse reactions/side effects

Common side effects include headache, weakness, dizziness, lightheadedness, tiredness, vomiting, loss of appetite, weight gain, muscle and joint pain, loss of sexual desire, feeling of being sick, etc. Tell your doctor if these side effects are persistent.

Check with your doctor immediately if you experience blurry vision, irregular heartbeat, fainting, shortness of breath, chest pain, swelling in hands and feet etc.

Serious side effects include passing of dark or bloody urine, yellowing of skin and eyes, black stools, persistent sore throat, bleeding gums, etc. In males prolonged painful erection lasting for 4 hrs or more can also happen. Seek for emergency help.



Doxazosin should not be used in children because the safety and effectiveness of the drug in children have not been confirmed.

Old people: 

It is used with extreme caution in elderly, especially over 60 years old as they are more sensitive to the side effects of the drug.

Pregnant women: 

Your doctor will weigh the risks and the benefits of taking the drug during pregnancy. You may be prescribed the drug only if your doctor considers it, which also depends on the stage of your pregnancy.

Lactating women: 

Discuss breastfeeding with your doctor because it’s quite possible for the medicine to pass on to the baby through breast milk. Usually lactating women are not prescribed the dose and may be some alternatives would be prescribed


What should I do if

I miss dose(s)

Take the missed dose as soon as possible. Skip the dose if it’s almost time for second dose. Do not take 2 doses together. Contact your doctor

I take over dose 

Call your doctor immediately

Dosage form: 

Tablet and extended release tablet.


The dosage will be different for different patients.  The recommended dose for hypertension is 1-16 mg daily and for benign prostatic hyperplasia is 1-8 mg daily.


Should be stored at room temperature, 15-30 C (59-86 F) and in a cool and dry place, out of reach of children.

Additional information if any

  • Could affect your ability to drive or operate machinery (computer, hardware, etc.)
  • Do not give it other people if they have similar condition like you
  • Do not take more than the prescribed dose
  • Always consult your doctor if you have any doubts

Written by: team

Date last updated: December 25, 2014