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Doxazosin Mesylate

Doxazosin Mesylate 4MG

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What is Doxazosin Mesylate?

If you are diagnosed with high blood pressure (hypertension), your doctor might prescribe doxazosin. For men with benign prostatic hyperplasia (BPH), the symptom of urinary retention may be relieved with doxazosin. Since doxazosin can affect the pupils, inform your doctor if you have cataracts and are taking this drug.

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What is Doxazosin Mesylate ?

If you are diagnosed with high blood pressure (hypertension), your doctor might prescribe doxazosin. For men with benign prostatic hyperplasia (BPH), the symptom of urinary retention may be relieved with doxazosin. Since doxazosin can affect the pupils, inform your doctor if you have cataracts and are taking this drug.
  • New or worsening chest pain
  • Lightheadedness, dizziness, or fainting
  • Painful erection or an erection that lasts longer than usual
  • Fast, slow, pounding, or uneven heartbeat
  • Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing
  • Keep all medicine out of the reach of children. Never share your medicine with anyone.
  • Your doctor will check your progress and the effects of this medicine at regular visits. Keep all appointments.
  • This medicine could lower your blood pressure too much, especially when you first use it or if you are dehydrated. This can make you dizzy or lightheaded. Do not drive or do anything else that could be dangerous until you know how this medicine affects you. Stand or sit up slowly if you feel lightheaded or dizzy.
  • Tell your doctor if you are pregnant or breastfeeding, or if you have liver disease, heart disease, prostate cancer, or stomach or bowel problems (such as a blockage). Tell your doctor if you plan to have cataract surgery.
  • This medicine may cause the following problems:New or worsening angina (chest pain)Priapism (painful, prolonged erection)
What is doxazosin mesylate used for?
Doxazosin mesylate is FDA-approved to treat high blood pressure and to relieve the urinary symptoms of an enlarged prostate (benign prostatic hyperplasia, or BPH). It relaxes muscle in blood vessels, the prostate, and the bladder neck. The extended-release form, Cardura XL, is approved for BPH only.
What are the most common side effects of doxazosin?
The most common side effects are dizziness and lightheadedness, especially when standing up, along with tiredness, headache, and swelling. These effects are most likely at the start of treatment or after a dose increase. Rarely, doxazosin can cause a prolonged, painful erection (priapism), which needs emergency care. Ask your provider about any side effect that concerns you.
Is doxazosin the same as Cardura?
Yes. Doxazosin is the generic name and Cardura is the brand name for the same medicine. The immediate-release generic doxazosin is FDA-approved and substitutable for brand Cardura. Cardura XL is a separate extended-release version approved for enlarged prostate only.
Should doxazosin be taken in the morning or at night?
Doxazosin is taken once a day, and your prescriber will tell you the best time for you. Because it can lower blood pressure and cause dizziness when you stand, many people are advised to take the first dose at bedtime and to be careful getting up. Follow your own prescription and your provider's instructions.
Does doxazosin lower blood pressure or treat an enlarged prostate?
It can do both. Immediate-release doxazosin is approved for high blood pressure and for BPH (enlarged prostate). Because it relaxes muscle in both blood vessels and the prostate, it lowers blood pressure and eases urine flow. The extended-release Cardura XL is approved for BPH only.
How much does Doxazosin Mesylate cost without insurance?
The price of Doxazosin Mesylate without insurance varies by pharmacy, dosage, and quantity. Rx.com compares cash prices at more than 60,000 US pharmacies so you can find the lowest price near you.
What are the common side effects of Doxazosin Mesylate?
Common side effects of Doxazosin Mesylate may include: New or worsening chest pain, Lightheadedness, dizziness, or fainting, Painful erection or an erection that lasts longer than usual, Fast, slow, pounding, or uneven heartbeat, Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing. This is not a complete list — consult your pharmacist or doctor for full side effect information.
Is there a generic version of Doxazosin Mesylate?
Generic versions may be available for Doxazosin Mesylate. Generics contain the same active ingredients as brand-name drugs and are typically 80–90% cheaper. Search Doxazosin Mesylate on Rx.com to compare generic and brand prices at pharmacies near you.
What is the cheapest pharmacy for Doxazosin Mesylate?
The cheapest pharmacy for Doxazosin Mesylate depends on your location and dosage. Rx.com compares prices at CVS, Walgreens, Walmart, Kroger, Costco, and thousands of independent pharmacies. Enter your ZIP code on Rx.com to find the lowest price for Doxazosin Mesylate near you.

Doxazosin Mesylate Coupons & Prices

Doxazosin Mesylate 4MG

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Doxazosin Mesylate Tablet — prescription drug image
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Doxazosin Mesylate 4mg (90)
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Compounded GLP-1 medications are not FDA-approved and are prepared by state-licensed compounding pharmacies. They are not affiliated with, endorsed by, or equivalent to any brand-name medication or manufacturer. Prescription required; eligibility is determined by a licensed provider. Prices are estimates and may vary.

Looking for a doxazosin mesylate coupon? Doxazosin is the low-cost generic form of Cardura, an alpha-1 blocker used to treat high blood pressure and the urinary symptoms of an enlarged prostate (BPH). Because it is generic, doxazosin is usually inexpensive, but the cash price can still vary a lot from one pharmacy to the next. Enter your ZIP code above to compare today's price at more than 60,000 pharmacies near you and show the discount at the counter.

What is doxazosin mesylate and how does it work?

Doxazosin (sold under the brand name Cardura, and as extended-release Cardura XL) is an alpha-1 adrenergic receptor blocker. It relaxes the smooth muscle in blood vessel walls, the prostate, and the bladder neck. That relaxation lowers blood pressure and makes it easier for men with benign prostatic hyperplasia (BPH, an enlarged prostate) to urinate. The FDA has approved immediate-release doxazosin for both high blood pressure and BPH; the extended-release Cardura XL is approved for BPH only.

Doxazosin mesylate is simply doxazosin combined with mesylate as a stabilizing salt, which is the standard form used in tablets. It is taken once daily.

Doxazosin cost and coupon savings without insurance

Doxazosin has been generic for years, so it is one of the more affordable blood pressure and prostate medications. Even so, cash prices are not the same everywhere, and one pharmacy in your town can charge noticeably more than another for the exact same tablets. That is why comparing before you fill matters.

Rx.com checks prices across more than 60,000 U.S. pharmacies and gives you a free discount coupon you can use whether or not you have insurance. There is no manufacturer copay or savings card for generic doxazosin, so a pharmacy discount coupon is typically the way to lower the cash price. Enter your ZIP above to see today's price near you.

Doxazosin alternatives and related medications

Doxazosin belongs to the same family as several other alpha-1 blockers. Your prescriber chooses among them based on whether the goal is lowering blood pressure, easing prostate symptoms, or both. Related options include:

  • Cardura — the brand-name version of doxazosin.
  • terazosin — another alpha blocker used for high blood pressure and BPH.
  • tamsulosin — an alpha blocker used mainly for BPH.
  • prazosin — an older alpha blocker.
  • finasteride — a 5-alpha-reductase inhibitor that shrinks the prostate over time and is sometimes combined with an alpha blocker for BPH.

Do not switch or combine medications on your own. Comparing prices is easy, but the choice of drug is a decision to make with your provider.

Safety information and common side effects

The most important thing to know about doxazosin is the risk of orthostatic (postural) hypotension — a sudden drop in blood pressure when you stand up that can cause dizziness, lightheadedness, or fainting. This is most likely with the first dose, when the dose is increased, or when restarting after a break, and it is most common 2 to 6 hours after a dose. Providers usually start at the lowest dose once daily, and you should avoid driving or hazardous tasks for about 24 hours after your first dose, a dose increase, or resuming therapy.

Other points from the FDA label: doxazosin can rarely cause priapism (a prolonged, painful erection that needs emergency care), and people who take or have taken an alpha blocker can develop Intraoperative Floppy Iris Syndrome during cataract surgery — so tell your eye surgeon you use it. Doxazosin does not carry a boxed warning. This is general information, not medical advice; talk with your doctor or pharmacist about your own situation.

Sources & accuracy

This Doxazosin Mesylate information was written and reviewed against authoritative U.S. medical sources — MedlinePlus (U.S. National Library of Medicine), DailyMed, and FDA prescribing information — and checked for accuracy. It is provided for education and is not a substitute for professional medical advice.

Verify the official label: Doxazosin Mesylate on DailyMed (FDA)

Reviewed against FDA labeling · Last reviewed July 2026

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Medical disclaimer: This information is provided for general educational purposes only and is not medical advice. It is not a substitute for professional diagnosis or treatment. Always consult a licensed physician, pharmacist, or other qualified healthcare provider before starting, stopping, or changing any medication or treatment. Never disregard professional medical advice or delay seeking it because of something you read here. If you think you may have a medical emergency, call your doctor or 911 immediately.


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