Doxazosin
(Doxazosin)Doxazosin Overview
Doxazosin is used alone or with other drugs to treat high blood pressure (hypertension). Lowering high blood pressure helps prevent strokes, heart attacks, and kidney problems. Doxazosin works by relaxing blood vessels so blood can flow more easily. Doxazosin is also used in men to treat the symptoms of an enlarged prostate (benign prostatic hyperplasia-BPH). It does not shrink the prostate, but it works by relaxing the muscles in the prostate and part of the bladder. This helps to relieve symptoms of BPH such as difficulty in beginning the flow of urine, weak stream, and the need to urinate frequently or urgently (including during the middle of the night). Doxazosin belongs to a class of drugs known as alpha blockers.
How to Use Doxazosin
Read the Patient Information Leaflet if available from your pharmacist before you start taking doxazosin and each time you get a refill. If you have any questions, ask your doctor or pharmacist. Take Doxazosin by mouth with or without food as directed by your doctor, usually once daily. Doxazosin may cause a sudden drop in your blood pressure, which could lead to dizziness or fainting, usually within 2 to 6 hours after you take it. This risk is higher when you first start taking Doxazosin, after your doctor increases your dose, or if you restart treatment after you stop taking it. During these times, avoid situations where you may be injured if you faint. To avoid injury related to dizziness or fainting, take your first dose of doxazosin at bedtime unless otherwise directed by your doctor. Your doctor will start Doxazosin at a low dose and gradually increase your dose. Any time your dose is increased or if you restart treatment after you have stopped it, take your first dose at bedtime unless otherwise directed. Follow your doctor's instructions carefully. The Dosage of Doxazosin is based on your medical condition and response to treatment. Take Doxazosin regularly to get the most benefit from it. To help you remember, take it at the same time each day. If you miss taking doxazosin for a few days, you may need to restart treatment at the low dose and gradually increase your dose again. Consult your doctor for more details. Keep taking Doxazosin even if you feel well. Most people with high blood pressure do not feel sick. You should see a benefit from Doxazosin within 1 to 2 weeks. Tell your doctor if your condition does not improve or if it worsens (for example, your blood pressure readings remain high or increase, or your BPH symptoms worsen).
Doxazosin Precautions
Before taking doxazosin, tell your doctor or pharmacist if you are allergic to it; or to other alpha blockers such as prazosin or terazosin; or if you have any other allergies. Doxazosin may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details. Before using Doxazosin, tell your doctor or pharmacist your medical history,heart disease (such as congestive heart failure, angina, heart attack in last 6 months), liver disease, certain eye problems (cataracts, glaucoma). Doxazosin may make you dizzy or drowsy. Alcohol or marijuana (cannabis) can make you more dizzy or drowsy. Do not drive, use machinery, or do anything that needs alertness until you can do it safely. Limit alcoholic beverages. Talk to your doctor if you are using marijuana (cannabis). See also How to Use section. Before having surgery (including cataract/glaucoma eye surgery), tell your doctor or dentist if you are taking or have ever taken Doxazosin, and about all the other products you use (including prescription drugs, nonprescription drugs, and herbal products). Older adults may be more sensitive to the side effects of Doxazosin, especially dizziness and low blood pressure when getting up from a sitting or lying position. These side effects can increase the risk of falling. During pregnancy, Doxazosin should be used only when clearly needed. Discuss the risks and benefits with your doctor. Doxazosin passes into breast milk. Consult your doctor before breast-feeding.
Doxazosin Misdose
If you miss a dose of Doxazosin, take it as soon as you remember. If it is near the time of the next dose, skip the missed dose. Take your next dose at the regular time. Do not double the dose to catch up. See also How to Use section.
Doxazosin Interactions
Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.other alpha blocker drugs (such as prazosin, tamsulosin). If you are also taking a drug to treat erectile dysfunction-ED or pulmonary hypertension (such as sildenafil, tadalafil), your blood pressure may get too low which can lead to dizziness or fainting. Your doctor may need to adjust your medications to minimize this risk. Other medications can affect the removal of doxazosin from your body, which may affect how doxazosin works. Examples include azole antifungals (such as itraconazole, ketoconazole), macrolide antibiotics (such as clarithromycin), HIV protease inhibitors (such as lopinavir), ritonavir, among others. Some products have ingredients that could raise your blood pressure. Tell your pharmacist what products you are using, and ask how to use them safely (especially cough-and-cold products, diet aids, or NSAIDs such as ibuprofen/naproxen).
Doxazosin Side Effects
Dizziness, lightheadedness, drowsiness, unusual tiredness, or weight gain may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. To reduce the risk of dizziness and lightheadedness, get up slowly when rising from a sitting or lying position. Remember that Doxazosin has been prescribed because your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using Doxazosin do not have serious side effects. Tell your doctor right away if you have any serious side effects,sore throat that doesn't go away, fainting, shortness of breath, weakness, swelling of hands/feet, yellowing eyes/skin, dark urine, easy bleeding/bruising, fever. Get medical help right away if you have any very serious side effects,chest pain. Rarely, males may have a painful or prolonged erection lasting 4 or more hours. If this occurs, stop using Doxazosin and get medical help right away, or permanent problems could occur. A very serious allergic reaction to Doxazosin is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction,rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing. This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch. In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.
Doxazosin Storage
Store at room temperature away from light and moisture. Do not store in the bathroom. Keep all medications away from children and pets. Do not flush medications down the toilet or pour them into a drain unless instructed to do so. Properly discard Doxazosin when it is expired or no longer needed. Consult your pharmacist or local waste disposal company.
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