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Doxazosin belongs to the family of medications called antihypertensives, specifically the alpha-1 receptor antagonists (alpha blockers). It is used to treat mild to moderate high blood pressure.
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Doxazosin belongs to the family of medications called antihypertensives, specifically the alpha-1 receptor antagonists (alpha blockers). It is used to treat mild to moderate high blood pressure. It may be used alone or in combination with other medications that treat high blood pressure. It works to control blood pressure by relaxing blood vessels.
It is also used to treat the symptoms of Benign Prostatic Hyperplasia (BPH or enlarged prostate). It works to relax the muscles around the neck of the bladder, allowing urine to flow out more freely. You may notice an improvement in symptoms within 1 to 2 weeks.
Doxazosin may be available under multiple brand names and/or in several different forms. Any specific brand name of Doxazosin may not be available in all of the forms or approved for all of the conditions discussed here. As well, some forms of Doxazosin may not be used for all of the conditions discussed here.
Your doctor may have suggested Doxazosin for conditions other than those listed in these drug information articles. If you have not discussed this with your doctor or are not sure why you are taking Doxazosin, speak to your doctor. Do not stop taking Doxazosin without consulting your doctor.
Do not give Doxazosin to anyone else, even if they have the same symptoms as you do. It can be harmful for people to take Doxazosin if their doctor has not prescribed it.
Your medication is delivered directly to you at no added cost. We even offer same-day delivery in select locations.
High blood pressure: The recommended adult dose of doxazosin ranges from 1 mg to 16 mg daily, depending on the person's needs and circumstances. The recommended initial dose of doxazosin for blood pressure is 1 mg once daily. This dose can be slowly increased to a maximum of 16 mg once daily.
BPH: The recommended dose for symptoms of enlarged prostate ranges from 1 mg to 8 mg once daily, depending on the person's needs and circumstances. The recommended initial dose of doxazosin for BPH is 1 mg once daily. This dose can be doubled every 1 to 2 weeks to a maximum of 8 mg once daily.
Doxazosin can be taken with or without food.
Many things can affect the dose of medication that a person needs, such as body weight, other medical conditions, and other medications. If your doctor has recommended a dose different from the ones listed here, do not change the way that you are taking the medication without consulting your doctor.
It is important to take Doxazosin exactly as prescribed by your doctor. If you miss a dose, take it as soon as possible and continue with your regular schedule. If it is almost time for your next dose, skip the missed dose and continue with your regular dosing schedule. Do not take a double dose to make up for a missed one. If you are not sure what to do after missing a dose, contact your doctor or pharmacist for advice. If you miss taking the medication for several days in a row, contact your doctor for advice. You may need to restart on a lower dose and gradually increase again.
Store Doxazosin at room temperature, protect it from light and moisture, and keep it out of the reach of children.
Do not dispose of medications in wastewater (e.g. down the sink or in the toilet) or in household garbage. Ask your pharmacist how to dispose of medications that are no longer needed or have expired.
Many medications can cause side effects. A side effect is an unwanted response to a medication when it is taken in normal doses. Side effects can be mild or severe, temporary or permanent.
The side effects listed below are not experienced by everyone who takes Doxazosin. If you are concerned about side effects, discuss the risks and benefits of Doxazosin with your doctor.
The following side effects have been reported by at least 1% of people taking Doxazosin. Many of these side effects can be managed, and some may go away on their own over time.
Contact your doctor if you experience these side effects and they are severe or bothersome. Your pharmacist may be able to advise you on managing side effects.
Although most of the side effects listed below don't happen very often, they could lead to serious problems if you do not seek medical attention.
Check with your doctor as soon as possible if any of the following side effects occur:
Stop taking the medication and seek immediate medical attention if any of the following occur:
Some people may experience side effects other than those listed. Check with your doctor if you notice any symptom that worries you while you are taking Doxazosin.
We sort your medication into clearly labeled, individual packs so you can be sure you're taking the right dose at the right time.
Doxazosin by Pro Doc is no longer being manufactured for sale in Canada. For brands that may still be available, search under doxazosin. This article is being kept available for reference purposes only. If you are using Doxazosin, speak with your doctor or pharmacist for information about your treatment options.
Do not take Doxazosin if you:
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There may be an interaction between doxazosin and any of the following:
If you are taking any of these medications, speak with your doctor or pharmacist. Depending on your specific circumstances, your doctor may want you to:
An interaction between two medications does not always mean that you must stop taking one of them. Speak to your doctor about how any drug interactions are being managed or should be managed.
Medications other than those listed above may interact with Doxazosin. Tell your doctor or prescriber about all prescription, over-the-counter (non-prescription), and herbal medications you are taking. Also tell them about any supplements you take. Since caffeine, alcohol, the Nicotine from cigarettes, or street drugs can affect the action of many medications, you should let your prescriber know if you use them.
Before you begin using a medication, be sure to inform your doctor of any medical conditions or Allergies you may have, any medications you are taking, whether you are pregnant or breast-feeding, and any other significant facts about your health. These factors may affect how you should use Doxazosin.
Blood cell counts: Doxazosin may cause leukopenia (low white blood cell count), which can mean your immune system is weak. If you develop a fever, talk to your doctor as soon as possible. Your doctor will also perform blood tests regularly to monitor your blood cell counts.
BPH: Doxazosin therapy does not cure or change the natural course of benign prostatic hyperplasia (BPH or enlarged prostate). It does not slow down or stop the progression of BPH. Note that BPH is not the same thing as Prostate Cancer, although they do cause many of the same symptoms. It is possible for men to have both BPH and prostate cancer at the same time.
Your doctor may check for prostate cancer before starting doxazosin and once a year after you turn 50 years old (40 years old if you have a family member who has had prostate cancer).
Drowsiness/reduced alertness: Due to the possibility of excessive lowering of blood pressure, avoid driving or performing hazardous tasks for 24 hours after your first dose of doxazosin, after the dose is increased, and when the medication is started again after not taking it for a period of time. You should also avoid situations where you could be injured if you were to lose consciousness.
Eye problems: During eye surgery for Cataracts, people who take or have taken doxazosin are at risk for developing a condition called intraoperative floppy iris syndrome (IFIS). This condition can lead to eye damage. If you are planning to have an operation on your eye, inform your doctor if you are taking or have taken doxazosin.
Kidney function: If you have reduced kidney function or Kidney Disease, discuss with your doctor how Doxazosin may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Doxazosin, and whether any special monitoring is needed.
Lactose: Doxazosin contains lactose. If you have hereditary problems of galactose intolerance, lactase deficiency or glucose-galactose malabsorption, discuss with your doctor whether Doxazosin is appropriate for you.
Liver function: Liver disease or reduced liver function may cause Doxazosin to build up in the body, causing side effects. If you have liver problems, discuss with your doctor how Doxazosin may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Doxazosin, and whether any special monitoring is needed.
People taking doxazosin may have changes in liver function that produce abnormal liver test results. Your doctor will recommend regular liver tests while you are taking Doxazosin. If you have severe changes in liver function, your doctor may recommend that you take a lower dose of Doxazosin or stop taking it altogether.
If you experience symptoms of liver problems such as fatigue, feeling unwell, loss of appetite, nausea, yellowing of the skin or whites of the eyes, dark urine, pale stools, abdominal pain or swelling, and itchy skin, contact your doctor immediately.
Low Blood Pressure: The first dose or first few doses of doxazosin can cause your blood pressure to lower. You may notice this particularly when moving from a sitting or lying position to a standing position. Be alert for any lightheadedness or dizziness. A similar effect can occur if doxazosin is started again after stopping for more than a few doses. These effects are most likely to occur 2 to 6 hours after taking the medication.
Lie down when symptoms of low blood pressure occur and be careful when getting up from a lying position (move slowly). If dizziness, lightheadedness, or palpitations are bothersome, report them to your doctor so that dose adjustment can be considered.
Long-term use: Long-term safety and efficacy (i.e., for more than 4 years) have not yet been established for the use of doxazosin in the treatment of BPH.
Pregnancy: Doxazosin crosses the placenta and may affect the developing baby if it is taken by the mother while she is pregnant. Doxazosin should not be used during pregnancy unless the benefits outweigh the risks. If you become pregnant while taking Doxazosin, contact your doctor immediately.
Breast-feeding: Doxazosin passes into breast milk. If you are a breast-feeding mother and are taking Doxazosin, it may affect your baby. Talk to your doctor about whether you should continue breast-feeding.
Children: The safety and effectiveness of using Doxazosin have not been established for children. It is not recommended for use by children.
Seniors: Seniors may experience excessive lowering of blood pressure or dizziness when they take doxazosin. Talk to your doctor if you have any concerns.
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All material © 1996-2021 MediResource Inc. Terms and conditions of use. The contents herein are for informational purposes only. Always seek the advice of your physician or other qualified health providers with any questions you may have regarding a medical condition.
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