Generic name: Doxazosin mesylate

Cardura is an antihypertensive agent. It works to reduce blood pressure. 

Quick Facts About Cardura


Used to treat high blood pressure. Also used to treat benign prostatic hyperplasia (BPH), an abnormal enlargement of the prostate gland, and with other medications such as Digitalis and diuretics to treat congestive heart failure.

Cardura Dosage

May be taken with or without food.

  • Usual adult dose: 1 milligram taken once per day to start. May be increased to 2 milligrams per day, up to 16 milligrams per day. As dose increases, so does potential for side effects.
  • Usual child dose: not generally prescribed for children.
  • Missed dose: take as soon as possible, unless almost time for next dose. In that case, do not take missed dose; go back to regular schedule. Do not double doses.

Cardura Side Effects

Overdose symptoms:

low blood pressure is the most likely symptom. If you suspect an overdose, immediately seek medical attention.

More common side effects: dizziness, drowsiness, fatigue, headache.

Less common Cardura side effects: arthritis, constipation, depression, difficulty sleeping, eye pain, flushing, gas, inability to hold urine, indigestion, inflammation of conjunctiva (pink eye), itching joint pain, lack of muscle coordination, low blood pressure, motion disorders, muscle cramps, muscle pain, muscle weakness, nausea, nervousness, nosebleeds, rash, ringing in ears, shortness of breath, tingling or pins and needles, weakness. Rare side effects: abnormal thinking, abnormal vision, agitation, altered sense of smell, amnesia, back pain, breast pain, changeable emotions, changes in taste, chest pain, confusion, coughing, decreased sense of touch, diarrhea, dizziness when standing up, dry mouth, dry skin, earache, excessive urination, fainting, fecal incontinence, fever, fluid retention, flu-like symptoms, gout, hair loss, heart attack, hot flushes, inability to concentrate, inability to tolerate light, increased appetite, increased sweating, increased thirst, infection, inflammation of the nose, loss of appetite, loss of sense of personal identity, migraine headache, morbid dreams, nausea, nervousness, pain, pallor, rapid pounding heartbeat, sexual problems, sinus inflammation, slight or partial paralysis, sore throat, tremors, twitching, vertigo, weight gain, weight loss, wheezing.


No significant drug interactions reported with Cardura.

No known food/other substance interactions. 

Special Cautions

If pregnant or planning to become pregnant, inform your doctor immediately. May appear in breast milk; could affect a nursing baby.

Seniors should use this medication with caution.

Not generally prescribed for children.

  • Avoid driving or any hazardous tasks within 24 hours of the first dose; may experience fainting, dizziness, or light-headedness. Additionally, may cause drowsiness; do not take part in any activity that requires alertness.
  • Should not take if sensitive to or allergic to this or medications such as Minipress or Hytrin.
  • Doctor should monitor closely if you have liver disease or are taking medications which affect liver function, and monitor blood counts.

Note: provides accurate and independent information prescription pills, over-the-counter medicines and natural products. This material is provided for educational purposes only and is not intended for medical advice, diagnosis or treatment. If you have questions about  dosage, or Cardura side effects, please contact your healthcare provider.