Doxazosin
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Reviewed on Apr 02, 2025. by Dr Alexandra Cristina Cowell Writer & Clinical Content Reviewer Next review due on April 03, 2028.
Dr Alexandra Cristina Cowell

Last updated on Apr 02, 2025.

Product info

  • Once-a-day pill that relaxes muscles around your prostate and bladder for BPH symptom relief.

  • Can make passing urine easier, and reduce bladder contractions to relieve urgency.
  • It can help with BPH symptoms in just a few weeks.

Price checker

$79.95
  • Prices include:
    Express shipping

    2-5 day shipping by secure courier

  • Consultation + Access to our clinicians

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  • Total
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    Save $0.00 each order
Doxazosin Doxazosin

What is Doxazosin?

Doxazosin is a daily tablet that helps relax muscles around your bladder, urethra, and prostate to make passing urine easier. This can help relieve symptoms of an enlarged prostate in people who struggle with urinary symptoms like a weak flow, or trouble initiating.

How does Doxazosin work?

It’s a type of alpha-1 blocker – which means it targets alpha-1 receptors that are involved in relaxing the smooth muscles around your bladder and prostate. By blocking these receptors, doxazosin relaxes the smooth muscle around your prostate and bladder. This should reduce any resistance and make passing urine easier.[1] And if you’re struggling with urinary urgency due to BPH, relaxing these muscles helps to reduce your bladder’s contractions – so you should be able to manage it better.

What doses does Doxazosin come in?

Doxazosin comes in four doses, 1 mg, 2 mg, 4 mg, and 8 mg. When you first start Doxazosin, your healthcare provider will usually start you at 1 mg per day. After a couple of weeks, once your body has gotten used to the treatment, they may increase it to the usual maintenance dose of 2 mg or 4 mg per day. If the 4 mg dose isn’t enough to manage your BPH symptoms effectively, your doctor may up your dose to the maximum of 8 mg per day.

Treated trusted source:

  1. Kim, J. Nguen, H. et al. (2023). Doxazosin. StatPearls. Treasure Island (FL): StatPearls Publishing.
treated.com This page was written by The Treated Content Team.
Dr Alexandra Cristina Cowell
This page was medically reviewed by Dr Alexandra Cristina Cowell on April 03, 2025. Next review due on April 03, 2028.

How we source info.

When we present you with stats, data, opinion or a consensus, we’ll tell you where this came from. And we’ll only present data as clinically reliable if it’s come from a reputable source, such as a state or government-funded health body, a peer-reviewed medical journal, or a recognised analytics or data body. Read more in our editorial policy.

Doxazosin Doxazosin

How to take Doxazosin

You’ll take your prescribed dose of Doxazosin once a day, in either the morning or the evening. It’s best to take doxazosin at the same time each day, but it can be taken with or without food – so whenever suits you best works. You’ll usually start taking the 1 mg dose of Doxazosin, so your body can get used to the treatment. Then your healthcare provider may increase your dose to a higher-strength daily tablet.

How long does it take for Doxazosin to work?

Doxazosin levels in your body peak within two or three hours of taking the tablet, but it can take a couple of weeks before you feel the full effects on your BPH symptoms.[1] So it’s important to keep taking doxazosin for a few weeks, even if you don’t notice any improvement to your symptoms at first.

What should I do if I make a mistake taking Doxazosin?

If you forget to take a dose of doxazosin, skip the missed dose and take your next dose when you normally would. Don’t take two tablets close to the same time to make up for a missed dose.

If you accidentally take too much doxazosin, seek medical attention right away. Doxazosin can lower your blood pressure, so taking too much can reduce your blood pressure to dangerous levels.

Treated trusted source:

  1. MedlinePlus (2017). Doxazosin.
treated.com This page was written by The Treated Content Team.
Dr Alexandra Cristina Cowell
This page was medically reviewed by Dr Alexandra Cristina Cowell on April 03, 2025. Next review due on April 03, 2028.

How we source info.

When we present you with stats, data, opinion or a consensus, we’ll tell you where this came from. And we’ll only present data as clinically reliable if it’s come from a reputable source, such as a state or government-funded health body, a peer-reviewed medical journal, or a recognised analytics or data body. Read more in our editorial policy.

Doxazosin Doxazosin

Doxazosin isn’t suitable for everyone, and there are some things that you need to be aware of when using it.

Here’s all the official info on it. If anything is unclear, let our clinician know, and they can talk with you about it.

Doxazosin Doxazosin

Doxazosin: FAQ

Have something specific you want to know? Search our info below, or ask our experts a question if you can’t find what you’re looking for.

Are there any Doxazosin alternatives?

Answer:
Doxazosin is a generic medication, named after its active ingredient. But it’s also available as a branded treatment, under the name Cardura. Cardura and Doxazosin are the exact same drug, containing the same active ingredient that works in the same way. The main differences will be the packaging, appearance of the tablets, and sometimes the price.

But if doxazosin isn’t the right treatment for you, there are other alpha-1 blockers available. These include treatments like terazosin, tamsulosin, and alfuzosin. These should be similarly effective, with the Agency for Health Care Policy and Research estimating that alpha-1 blockers have a mean probability of 74% when it comes to improving BPH symptoms.[1]

If alpha-1 blockers haven’t helped to relieve your BPH symptoms, alpha-5 reductase inhibitors like finasteride and dutasteride might be another option. These tend to take longer to work than alpha-1 blockers (between three and six months), but help relieve your symptoms at the root cause. They reduce the amount of testosterone that gets converted into dihydrotestosterone, which plays a key role in prostate growth. Over time, this reduces the size of your prostate, which means it puts less pressure on your bladder and urethra, and should ease your symptoms.[2]

How effective is Doxazosin?

Answer:
Clinical trials have proven that doxazosin is an effective and safe long term treatment for BPH symptoms. A study in which 272 people without high blood pressure and 178 people with high blood pressure (all of whom had BPH) took doxazosin for up to 48 months found that treatment resulted in significantly increased urinary flow rates. Patients also claimed that obstructive and irritative BPH symptoms were improved significantly by doxazosin treatment.[3]

Are there any Doxazosin side effects?

Answer:
Like any medication, doxazosin comes with some risk of side effects. If you experience any shortness of breath, changes to your heart rate, or chest pain when using doxazosin, tell your doctor right away.

The most common side effects of Doxazosin include:

  • Dizziness

  • Vertigo

  • Headache

  • Low blood pressure

  • Swelling in your feet, ankles, or fingers

  • A chest cold, coughing, or an infection in your respiratory tract

  • A runny or blocked nose

  • Stomach pain, nausea, or vomiting

  • Urinary tract infections

  • Urinary incontinence

  • An inflamed bladder

  • Fatigue and weakness

  • Indigestion or heartburn

  • Dry mouth

  • Itching

  • Back or muscle pain

  • Flu-like symptoms


This isn’t a complete list of all possible doxazosin side effects. If you have any questions or concerns, speak to your healthcare provider, or take a look at the package insert.

Do I need a prescription for Doxazosin?

Answer:
Yes, doxazosin is a prescription medicine. Your healthcare provider will need to check your medical history and any other drugs you might be using, to make sure doxazosin is a safe and effective option for you. Because it lowers your blood pressure, it might not be a suitable option if you’re already living with low blood pressure.

Treated trusted source:

  1. Chapple, C.R. (2005). A Comparison of Varying α-Blockers and Other Pharmacotherapy Options for Lower Urinary Tract Symptoms. 7(4).
  2. Salisbury, B.H. et al. (2024). 5α-Reductase Inhibitors. StatPearls. Treasure Island (FL): StatPearls Publishing.
  3. Leper, H. et al. (1997). Doxazosin for benign prostatic hyperplasia: long-term efficacy and safety in hypertensive and normotensive patients. The Multicenter Study Group. Journal of Urology. 157(2). pp. 525-530.

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