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Doxazosin is used in the treatment of high blood pressure and problems with urination which are consequences of enlarged prostate. Doxazosin can relax the blood vessels so the blood can circulate more efficiently through your arteries and veins. It also loosens up the prostate muscles so you can pass urine more easily. Doxazosin must be taken exactly as your doctor has prescribed.

Side Effects

Most patients respond to Doxazosin treatment very well. The side effects usually occur at the beginning of the treatment with Doxazosin and they are mostly mild to moderate. Such side effects may include dizziness, faintness, headache, runny nose and mild headache. Other common side effects are heartburn and upset stomach. However, there are side effects which are severe but they occur in rare cases. Such side effects may include irregular pulse, pain in the chest and severe and persistent headache. You may also develop problems with urination, such as pain while passing urine or difficulties to start urination. Your hands, feet and ankles may swell as a reaction to Doxazosin. You may also develop problems with erection, which include pain and prolonged erection. Vision impairment can occur as a consequence of taking Doxazosin. Other side effect include extreme fatigue and dizziness, pain in the back, hot flashes, pain in the abdomen, diarrhea, nausea, constipation, flatulence, dry mouth and sleeping disorders. In case of any side effects, you must visit your doctor, so the dose of Doxazosin can be adjusted or you may be given another medication.

Allergic Reactions

If you did not know that you are allergic to Doxazosin, you may experience allergic reactions, such as skin disorders, swelling of the tongue, lips or face. Skin disorders may include rash, itchiness and irritation. In more severe allergic reaction you may experience breathing difficulties and tightness in the chest.


Since at the beginning of treatment with Doxazosin you may feel fainting or dizzy, it is recommended to be careful while you drive or operate hazardous equipment. Dizziness can be triggered by getting up too fast or standing in the sunlight for too long. You should inform your doctor if you are allergic to any medications and if you are receiving therapy for some other condition. In case of liver disease or prostate cancer, your doctor will have to adjust the dose or to change the medication. If you are pregnant or you are breastfeeding, tell your doctor about it because there is a risk that Doxazosin will harm the baby. If you need a cataract surgery, inform your ophthalmologist that you are taking Doxazosin.

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