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Cardura (Doxazosin)

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What is Generic?

What is a Generic Drug?

A generic drug is a copy of the brand-name drug with the same dosage, safety, strength, quality, consumption method, performance, and intended use. Before generics become available on the market, the generic company must prove it has the same active ingredients as the brand-name drug and works in the same way and in the same amount of time in the body.

The only differences between generics and their brand-name counterparts is that generics are less expensive and may look slightly different (eg. different shape or color), as trademarks laws prevent a generic from looking exactly like the brand-name drug.

Generics are less expensive because generic manufacturers don't have to invest large sums of money to develop a drug. When the brand-name patent expires, generic companies can manufacture a copy of the brand-name and sell it at a substantial discount.


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Cardura is a medication that belongs to a class of drugs called alpha-blockers. It is primarily used to treat high blood pressure (hypertension) and urinary symptoms associated with an enlarged prostate gland (benign prostatic hyperplasia or BPH). Cardura works by relaxing the muscles in the blood vessels and in the prostate, allowing for improved blood flow and the relief of urinary symptoms.

Before you buy Cardura or Cardura generic, it is important that you talk to your healthcare provider about its potential side effects and effectiveness.

Fact Table
Formula C23H25N5O5
License US FDA, US DailyMed, US FDA
Bioavailability 65%
Legal status Rx-Only
Chemical Name Doxazosin
Elimination half-life 22 hours
Dosage (Strength) 1mg, 2mg, 4mg
Pregnancy Consult Doctor
Brands Cardura
Protein binding 98%
PubChem CID 3157
MedlinePlus a693045
ChEBI 4708
ATC code C02CA04
DrugBank DB00590
KEGG D07874
Routes of administration By mouth

Buy Cardura (Doxazosin) online from online Canadian Pharmacy |


Follow your doctor's instructions for taking Cardura precisely. Do not skip doses, alter the Cardura dosage, or discontinue the medication without seeking advice from your physician. Typically, you should take Cardura once daily, either with or without food, according to your doctor's recommendations. Be cautious, especially when initiating treatment, as it can lead to a drop in blood pressure, potentially resulting in dizziness or fainting.


The active ingredient in Cardura is Doxazosin.


If you have a known allergy to Doxazosin or any other alpha-blockers, inform your healthcare provider before starting Cardura.

Cardura can cause a drop in blood pressure, especially when standing up from a sitting or lying position. This may could lead to dizziness or fainting.

Inform your healthcare provider if you have liver or kidney problems, as the dosage may need adjustment.

If you are scheduled for eye surgery due to cataracts or any other surgery, inform your surgeon that you are taking Cardura.

Cardura is not recommended during pregnancy or while breastfeeding unless advised otherwise by your healthcare provider.

Discuss the use of alcohol or other medications with your healthcare provider, as they may interact with Cardura and affect its effectiveness or increase the risk of side effects.

Cardura may cause dizziness or drowsiness. Exercise caution and avoid engaging in tasks like driving or operating heavy equipment until you have a clear understanding of how this medication impacts your abilities.


Cardura may interact with various medications and substances, potentially affecting its effectiveness or increasing the risk of side effects. Some common interactions include antihypertensive medications, alpha-blockers, PDE5 inhibitors, CYP3A4 inhibitors, alcohol and certain herbal supplements, such as saw palmetto and St. John's wort.

Side Effects

Common side effects of Cardura may include:

  • Dizziness
  • Headache
  • Fatigue
  • Swelling of the ankles, feet, or hands
  • Nasal congestion
  • Nausea
  • Abdominal pain
  • Dry mouth
  • Sleep disturbances

Frequently Asked Questions about Cardura (Doxazosin)

What is Cardura, and what is it used for?

Cardura is a brand name for the medication doxazosin. It belongs to a class of drugs called alpha-blockers and is primarily prescribed to treat high blood pressure (hypertension) and benign prostatic hyperplasia (BPH), a condition where the prostate gland enlarges, causing urinary problems.

How does Cardura work to lower blood pressure?

Cardura works by relaxing the muscles in blood vessel walls, making it easier for blood to flow. This relaxation of blood vessels reduces resistance and ultimately lowers blood pressure.

Can Cardura cure high blood pressure or BPH?

No, Cardura does not cure high blood pressure or BPH. It helps manage the symptoms and complications associated with these conditions. To maintain its benefits, you need to continue taking the medication as prescribed by your healthcare provider.

What is the recommended dosage of Cardura?

The dosage of Cardura varies depending on the condition being treated. Typically, the starting dose for high blood pressure is 1 mg daily, while for BPH, it may start at 1 mg daily and increase gradually. Follow your doctor's instructions carefully on your recommended dosage.

How should I take Cardura?

Cardura is usually taken by mouth with or without food, as directed by your healthcare provider. It is essential to take it at the same time each day to maintain a consistent level of the medication in your body. Swallow the tablet whole and do not crush or chew it.

What are the potential side effects of Cardura?

Common side effects of Cardura may include dizziness, lightheadedness, headache, tiredness, and stomach upset. More serious side effects can include a rapid drop in blood pressure, which may lead to fainting, and changes in vision. Contact your healthcare provider if you experience severe or bothersome side effects.

Can I drink alcohol while taking Cardura?

It is advisable to avoid or limit alcohol consumption while taking Cardura. Alcohol can increase the risk of dizziness and low blood pressure, which are common side effects of this medication.

Can I take Cardura if I am pregnant or breastfeeding?

Cardura should not be used during pregnancy or during breastfeeding unless your healthcare provider determines that the benefits outweigh the potential risks.

Can I stop taking Cardura abruptly?

No, do not stop taking Cardura suddenly without consulting your healthcare provider. Abruptly discontinuing the medication can lead to an increase in blood pressure or worsening of BPH symptoms. Your doctor will provide guidance on how to gradually reduce the dose if necessary.

Is Cardura available as a generic medication?

Yes, Cardura is available in generic form as doxazosin. Generic versions of the medication are usually more affordable than the brand-name product but contain the same active ingredient.

IMPORTANT NOTE: The above information is intended to increase awareness of health information and does not suggest treatment or diagnosis. This information is not a substitute for individual medical attention and should not be construed to indicate that use of the drug is safe, appropriate, or effective for you. See your health care professional for medical advice and treatment.