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Cardura XL is an extended release tablet made up of doxazosin mesylate. This medication is known as a beta blocker and comes in doses of 4mg and 8 mg. We carry both the brand name (Cardura XL) and its generic alternative, named after Cardura XLS ingredient (doxazosin mesylate)!

Cardura XL is very similar to Cardura but also has some important differences. Unlike Cardura, Cardura XL is not (and should not be) used to treat hypertension (high blood pressure). However, just like the original Cardura, it is used to treat BPH (benign prostatic hyperplasia) which is when a man’s prostate is enlarged. This can cause unwanted urination troubles where urination is hard to achieve or needing to urinate frequently or urgently (even while asleep).

Cardura XL works because the doxazosin mesylate acts on the prostate and bladder neck by relaxing the muscles. It does not shrink the prostate but relaxing the muscles allows relief from the symptoms.

Always follow directions given to you by your doctor. Most prescription labels have the directions written on them for your convenience.

This medication is to be taken by mouth with breakfast. Most dosages are taken once a day.

This medication could cause dizziness within a few hours of taking it. It is suggested you take your dose at bedtime to avoid this from happening.

Do not crush or chew this tablet. It must be swallowed whole. Drink with water to help flush it down.

This medication must be taken regularly to achieve effectiveness. Use a pillbox or set a reminder and take it at the same time everyday to ensure you do not miss a dose.


Tell your doctor (and all other healthcare professionals) about all medications you are currently taking including prescription, over-the-counter, vitamins, and herbal remedies. Also be sure to mention any drug allergies you may have including food and other substances. Include what signs you noticed during your last allergic reaction.

Do not use this medication to treat hypertension. There are other medications much safer and effective for that condition.

Tell your doctor if you have liver disease before taking this medication.

Avoid driving while using this medication until you fully understand how it affects you.

Do not be concerned if you see a part of the tablet in your stool. This is normal and should not alarm you.

Stand up slowly from any lying or sitting position to avoid the chance of becoming lightheaded.

It is important to keep an eye on your blood pressure while using this medication; get regular tests done.

This medication can interact with cataract surgery. Make sure to let your doctor know you are on this medication before proceeding.

This medication could have more side effects on the elderly.

This medication is not meant for females.

Side Effects

Please note this is not a complete list of side effects. Not everyone experiences side effects; they are not guaranteed. If you do have side effects and they become unmanageable, consult your doctor about alternate medications.

Common side effects of Cardura XL may include:

  • Feeling dizzy.
  • Feeling sleepy or tired.
  • Feeling weak
  • A headache.

Serious side effects of Cardura XL may include:

  • Very bad dizziness or passing out.
  • Chest pain that is new or worse.
  • Shortness of breath.
  • Swelling in the arms or legs.
  • Chest pain.
  • Fainting.
  • A painful and prolonged erection – seek medical attention right away if this occurs or you could suffer permanent damage and will not be able to partake in sexual activity.

Signs to watch for:

allergic reaction: sneezing and an itchy, runny or blocked nose (allergic rhinitis), itchy, red, or watering eyes (conjunctivitis), wheezing, chest tightness, shortness of breath, cough, a raised itchy, red rash (hives) or swollen lips, tongue, eyes or face.


What is Doxazosin Mesylate?

Doxazosin Mesylate, an alpha-adrenergic blocker, is the active ingredient that makes up the brand-name medication Cardura XL. It comes in the form of an oral tablet in 2 strengths; 4 and 8 mg. After being administered, Doxazosin Mesylate is metabolized by the liver and remains in the system for up to 5 days. The active ingredient, Doxazosin Mesylate, has been used in medicine since 1988, over 30 years ago. We carry the brand-name product, as well as the generic alternative, at My Drug Center; the brand-name product can be purchased in 4 and 8 mg while the generic is available in 4mg.


What is Doxazosin Mesylate used for?

Doxazosin Mesylate, in the form of Cardura XL, is used to help alleviate the symptoms of an enlarged prostate in male adults. An enlarged prostate, also known as benign prostatic hyperplasia (BPH) is a common condition that affects approximately one third (1/3) of men above the age 50; at the age of 85, about 90% of men may have an enlarged prostate. The prostate is located between the bladder and the penis and is about the size of a walnut; when a man has BPH, the prostate may now be the size of a lemon. This change in size can obstruct urination and cause irritating symptoms. These symptoms may include trouble starting to urinate, having to strain or push in order to urinate, and having to stop and restart several times. Additionally, the stream may be weak and urine may dribble out at the end. Please note; this medication is not used for hypertension, unlike the regular release form of this medication (Cardura); do not use this medication for anything other than what it has been prescribed for.

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