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.

Cardura XL (Doxazosin XL)


Cardura XL (Doxazosin XL)

Prescription Required


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  • Product Details


    Cardura XL is a prescription medication in the drug class alpha-1 blockers. It contains the active ingredient doxazosin, which relaxes the smooth muscles in the prostate and bladder neck, easing the symptoms associated with benign prostatic hyperplasia (BPH). Cardura XL is an extended-release tablet that provides slow and steady release of the medication over a 24-hour period.


    Cardura XL is used for the treatment of:

    • Benign Prostatic Hyperplasia (BPH): The usual starting dose is 1 mg once daily. Your doctor may increase the dose every 1-2 weeks to a maximum of 8 mg once daily.
    • Hypertension: The starting dosage is 1 mg once daily. The dose may be increased to a maximum of 16 mg once daily.


    The active ingredient in Cardura XL doxazosin.


    The most common drug-drug interactions include:

    • Alfuzosin
    • Amlodipine
    • Atenolol
    • Bisoprolol
    • Candesartan
    • Carbamazepine
    • Carvedilol
    • Celecoxib
    • Chlorthalidone
    • Clarithromycin
    • Clonidine
    • Diclofenac
    • Diltiazem
    • Enalapril
    • Etodolac
    • Grapefruit juice
    • Hydrochlorothiazide
    • Ibuprofen
    • Indapamide
    • Indomethacin
    • Itraconazole
    • Ketoconazole
    • Ketoprofen
    • Lisinopril
    • Losartan
    • Meloxicam
    • Metoprolol
    • Nabumetone
    • Naproxen
    • Nebivolol
    • Phenobarbital
    • Phenytoin
    • Piroxicam
    • Prazosin
    • Propranolol
    • Ramipril
    • Rifampin
    • Ritonavir
    • Spironolactone
    • St. John's Wort (herbal supplement)
    • Tamsulosin
    • Terazosin
    • Valsartan
    • Verapamil


    Tell your doctor if you have any history of low blood pressure, liver disease, or fainting episodes.

    Cardura XL may cause dizziness or drowsiness, so caution should be exercised when driving, operating machinery, or performing tasks that require alertness.

    Your doctor will adjust the dosage of Cardura XL based on your response.

    Side Effects

    Some of the most common side effects of this drug include:

    • Dizziness
    • Drowsiness
    • Fainting
    • Fatigue
    • Headache
    • Heart palpitations
    • Hypotension
    • Nausea
    • Nasal congestion
    • Nervousness
    • Rapid heartbeat
    • Sexual difficulties
    • Shortness of breath
    • Stomach pain
    • Swelling in the extremities (edema)
    • Tiredness
    • Urinary incontinence or retention


    Cardura XL [package insert]. New York, NY: Pfizer; 2021.

    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.

    Product Code : 13829

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