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Contents
Common use
Cardura (doxazosin) belongs to a class of medications called alpha-1 adrenergic blockers. It is used to treat high blood pressure (hypertension) and symptoms of benign prostatic hyperplasia (BPH), which is an enlarged prostate.
For hypertension, Cardura helps lower blood pressure by relaxing and widening blood vessels. For BPH, it relaxes the muscles in the bladder and prostate, improving urination in men who have difficulty starting urination, weak stream, or frequent urination at night.
Although Cardura can help manage both conditions, it does not cure them. Regular use is required to keep symptoms under control.
Dosage and direction
Take Cardura exactly as prescribed by your doctor. It is usually taken once a day, either in the morning or evening, with or without food.
The initial dose is often low (e.g., 1 mg) to reduce the risk of sudden low blood pressure, and then gradually increased to 4 mg or 8 mg depending on your response.
Swallow tablets whole with a glass of water. Do not crush or chew them. Blood preasure should be monitored frequently, especially after the first dose.
Precautions
Tell your doctor if you have a history of heart disease, liver problems, or if you are taking medications for erectile dysfunction (like sildenafil or tadalafil), as these combinations can cause dangerously low blood pressure.
Be careful when rising from a sitting or lying position - Cardura can cause dizzyness or fainting, especially after the first dose or dose increases.
This drug may affect pupil response during cataract surgery. Always inform your eye surgeon beforehand if you're taking Cardura.
Contraindications
Do not take Cardura if you are allergic to doxazosin or other similar medications (e.g., prazosin, terazosin).
It is contraindicated in people with a history of orthostatic hypotension or those who have had severe episodes of low blood pressure.
Extended-release forms should not be used in patients with chronic constipation, a narrowing of the gastrointestinal tract, or history of bowel blockage.
Possible side effects
Common side effects include dizziness, fatigue, headache, swollen legs or ankles, and nasal congestion.
Some patients may also experience low blood pressure, rapid heart rate, or drowsiness.
Serious but rare side effects include fainting, painful erection lasting more than 4 hours (priapism), and chest pain. Seek imediate medical help if these occur.
Drug interactions
Cardura may interact with:
PDE5 inhibitors (sildenafil, tadalafil)
Other blood pressure medications (beta-blockers, ACE inhibitors)
Diuretics
NSAIDs (may reduce effectiveness)
Alcohol (may increase drowsiness and blood pressure lowering effect)
Inform your doctor of all medications, vitamins, and herbal supplements you use.
Missed dose
If you miss a dose, take it as soon as you remember. If it is almost time for your next dose, skip the missed one. Do not double up the dose.
Overdose
Symptoms of overdose may include extreme dizzyness, fainting, weakness, or very low blood pressure. Seek emerjency care immediately.
Storage
Store Cardura at room temperature (20° - 25°C / 68° - 77°F), away from moisture and direct heat. Keep tablets in their original packaging. Keep out of reach of children and pets.
U.S. Sale and Prescription Policy
In the United States, Cardura is classified as a prescription medication, approved by the FDA for the treatment of high blood pressure and BPH. It cannot be purchased legally without a valid prescription from a licensed healthcare provider.
Prescriptions are typically provided following blood pressure evaluation or urological consultation. Periodic follow-up is required to monitor blood pressure, kidney function, and prostate symptoms.
Cardura is available in standard and extended-release formulations. Generic versions (doxazosin) are also widely available and generally covered by insurance.
Online telehealth services may also prescribe Cardura after a remote evaluation, but controlled dispensing regulations still apply to all U.S. pharmacies.
Disclaimer
This text is provided for general informational purposes only. It does not replace medical advice, diagnosis, or treatment. Always consult a licensed healthcare provider before starting or changing any medication. We are not responsble for misuse or misinterpretation of the information presented.