Doxazosin

generic for Cardura

Doxazosin Side Effects

Dizziness, lightheadedness, drowsiness, unusual tiredness, or weight gain may occur. If any of these effects persist or worsen, 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 your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Tell your doctor right away if you have any serious side effects, including: fainting, shortness of breath, weakness, swelling of hands/feet, yellowing eyes/skin, dark urine, easy bleeding/bruising, fever, persistent sore throat.

Get medical help right away if you have any very serious side effects, including: chest pain.

Rarely, males may have a painful or prolonged erection lasting 4 or more hours. If this occurs, stop using this drug and get medical help right away, or permanent problems could occur.

A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: 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.

In the US -

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.
  • purpura
  • thrombocytopenic disorder
  • leukopenia
  • neutropenic disorder
  • libido changes
  • blurred vision
  • visual changes
  • angina
  • bradycardia
  • cardiac arrhythmia
  • chronic heart failure
  • orthostatic hypotension
  • hypotension
  • upper respiratory infection
  • rhinitis
  • bronchospastic pulmonary disease
  • xerostomia
  • dyspepsia
  • gastrointestinal obstruction
  • hepatitis
  • cholestasis
  • urinary tract infection
  • hematuria
  • priapism
  • erectile dysfunction
  • gynecomastia
  • pruritus of skin
  • alopecia
  • urticaria
  • arthralgia
  • muscle weakness
  • myalgia
  • cramps
  • drowsy
  • syncope
  • vertigo
  • dizziness
  • insomnia
  • fatigue
  • hypesthesia
  • skin rash
  • edema
  • flushing
  • weight gain
  • headache disorder
  • epistaxis
  • palpitations
  • dyspnea
  • chest pain
  • nausea
  • vomiting
  • diarrhea
  • dysuria
  • increased urinary frequency
  • polyuria
  • nocturia
  • abnormal hepatic function tests
  • nervousness
  • angioedema
  • paresthesia
  • cholestatic hepatitis
  • general weakness
  • malaise
  • irritability
  • acute abdominal pain
  • jaundice
  • intraoperative floppy iris syndrome
  • symptoms of anxiety
  • tachycardia

Drug 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.

Some products that may interact with this drug include: 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), boceprevir, 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).