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Doxazosin can cause low blood pressure, especially when you first start taking the medication and when dosage is increased. This can cause you to become faint, dizzy, or light-headed, particularly when first standing up. You should avoid driving or any hazardous tasks where injury could occur for 24 hours after taking the first dose, after your dose has been increased, or if Doxazosin has been stopped and then restarted.

In rare cases, men taking drugs such as Doxazosin have developed priapism--a painful, long-lasting erection that persists for hours. This condition can lead to impotence, so if it occurs contact your physician right away.

If you have liver disease or are taking other medications that alter liver function, your physician will monitor you closely when you take Doxazosin.

Doxazosin may lower blood counts. Your physician will most likely monitor your blood counts while you are taking this medication.

This medication may cause you to become drowsy or sleepy. For this reason, too, driving or operating dangerous machinery or participating in any hazardous activity that requires full mental alertness is not recommended.

Prostate cancer has some of the same symptoms as benign prostatic hyperplasia; your physician will want to make sure you do not have cancer before starting you on Doxazosin.
The effects of Doxazosin during pregnancy have not been adequately studied. If you are pregnant or plan to become pregnant, inform your physician immediately. Doxazosin may appear in breast milk and could affect a nursing infant. If this medication is essential to your health, your physician may advise you to discontinue breastfeeding until your treatment with this medication is finished.

If you have high blood pressure, you must take Doxazosin regularly for it to be effective. Since blood pressure declines gradually, it may be several weeks before you get the full benefit of Doxazosin; and you must continue taking it even if you are feeling well. Doxazosin does not cure high blood pressure; it merely keeps it under control.

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Uses
Doxazosin is used in the treatment of benign prostatic hyperplasia, a condition in which the prostate gland grows larger, pressing on the urethra and threatening to block the flow of urine from the bladder. The drug relieves symptoms such as a weak stream, dribbling, incomplete emptying of the bladder, frequent urination, and burning during urination.
Doxazosin is also used in the treatment of high blood pressure. It is effective when used alone or in combination with other blood pressure medications, such as diuretics, beta-blocking medications, calcium channel blockers or ACE inhibitors.

Physicians also prescribe Doxazosin , along with other drugs such as digitalis and diuretics, for treatment of congestive heart failure.

Dosage and administration
Doxazosin can be taken with or without food. Doxazosin should be taken exactly as prescribed, even if your symptoms have disappeared. Try not to miss any doses. If this medication is not taken regularly, your condition may worsen. If you have benign prostatic hyperplasia, you should see improvement in a week. Blood pressure will fall in 2 to 6 hours.
Adults: Your physician will adjust the dosage to fit your needs. The usual starting dose is 1 milligram taken once a day. To minimize the potential for dizziness or fainting associated with Doxazosin, which may occur between 2 and 6 hours after a dose, your physician will monitor your blood pressure during this period and afterwards. After the effects of the starting dose are measured, your physician may increase the daily dose to 2 milligrams and then, if necessary, to 4 milligrams, 8 milligrams, or, in people with high blood pressure only, up to 16 milligrams. As the dose increases, the potential for side effects such as dizziness, vertigo, light-headedness, and fainting also increases.

Children: The safety and effectiveness of this drug in children have not been established.
If you miss a dose: Take it as soon as you remember. If it is almost time for your next dose, skip the one you missed and go back to your regular schedule. Never take 2 doses at the same time.

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What is this medicine?

DOXAZOSIN is an antihypertensive. It works by relaxing the blood vessels. It is used to treat benign prostatic hyperplasia (BPH) in men and to treat high blood pressure in both men and women.
What should my health care professional know before I take this medicine?

They need to know if you have any of the following conditions:

kidney or liver disease
low blood pressure
an unusual or allergic reaction to doxazosin, other medicines, foods, dyes, or preservatives
pregnant or trying to get pregnant
breast-feeding

How should I take this medicine?

Take this medicine by mouth with a glass of water. Take your doses at regular intervals. Do not take your medicine more often than directed. Do not stop taking except on the advice of your doctor or health care professional.

Talk to your pediatrician regarding the use of this medicine in children. Special care may be needed.

Overdosage: If you think you have taken too much of this medicine contact a poison control center or emergency room at once.

NOTE: This medicine is only for you. Do not share this medicine with others.
What if I miss a dose?

If you miss a dose, take it as soon as you can. If it is almost time for your next dose, take only that dose. Do not take double or extra doses.
What may interact with this medicine?

cimetidine
medicines for colds or hay fever
medicines for overactive bladder
sildenafil
tadalafil
vardenafil

This list may not describe all possible interactions. Give your health care providers a list of all the medicines, herbs, non-prescription drugs, or dietary supplements you use. Also tell them if you smoke, drink alcohol, or use illegal drugs. Some items may interact with your medicine.
What should I watch for while taking this medicine?

Visit your doctor or health care professional for regular checks on your progress. Check your blood pressure regularly. Ask your doctor or health care professional what your blood pressure should be and when you should contact him or her.

Drowsiness and dizziness are more likely to occur after the first dose, after an increase in dose, or during hot weather or exercise. These effects can decrease once your body adjusts to this medicine. Do not drive, use machinery, or do anything that needs mental alertness until you know how this drug affects you. Do not stand or sit up quickly, especially if you are an older patient. This reduces the risk of dizzy or fainting spells. Alcohol can make you more drowsy and dizzy. Avoid alcoholic drinks.

Do not treat yourself for coughs, colds, or pain while you are taking this medicine without asking your doctor or health care professional for advice. Some ingredients may increase your blood pressure.

Your mouth may get dry. Chewing sugarless gum or sucking hard candy, and drinking plenty of water may help. Contact your doctor if the problem does not go away or is severe. What side effects may I notice from taking this medicine?

Side effects that you should report to your doctor or health care professional as soon as possible:

allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
breathing problems
changes in vision
chest pain
fast or irregular heartbeat
feeling faint or lightheaded, falls
numbness in hands or feet
prolonged painful erection of the penis
swelling of the legs or ankles
unusually weak or tired

Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):

headache
nausea

This list may not describe all possible side effects.
Where can I keep my medicine?

Keep out of the reach of children.

Store at room temperature below 30 degrees C (86 degrees F). Throw away any unused medicine after the expiration date.