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Contents
Common use
Cardura, with the active component doxazosin, is an alpha-1 adrenergic receptor antagonist. It's primarily prescribed for managing high blood pressure (hypertension) and alleviating urinary symptoms associated with benign prostatic hyperplasia (BPH).
In cases of hypertension, the medication works by relaxing the blood vessel walls, resulting in improved blood flow and lower pressure. For BPH, Cardura helps by easing the smooth muscles in the prostate and bladder neck, thereby enhancing urine flow and reducing nighttime urination or urgency.
Although Cardura effectively controls symptoms, it does not cure the underlying condition. Continuous use is required to maintain its therapeutic benefits.
Dosage and direction
Cardura should be taken exactly as directed by your healthcare provider. It is commonly administered once daily, either in the morning or evening, with or without meals.
Treatment typically starts with a low dose - such as 1 mg daily - to minimize the risk of a sudden drop in blood pressure. Dosage can later be titrated to 4 mg or 8 mg based on response and tolerance.
Take the tablets whole with water. Do not break, chew, or crush them. Blood pressure should be monitored frequently, especially after initiating treatment or adjusting the dose.
Precautions
Inform your doctor if you have any cardiovascular conditions, liver dysfunction, or if you are using medications to treat erectile dysfunction such as tadalafil or sildenafil. These combinations may significantly lower your blood pressure.
Cardura may lead to dizziness or fainting, especially after the first dose or during dosage changes. To avoid sudden drops in blood pressure, rise slowly from seated or lying positions.
If you are scheduled for cataract surgery, inform your ophthalmologist beforehand, as Cardura can interfere with pupil dilation.
Contraindications
Do not use Cardura if you have a known hypersensitivity to doxazosin or other drugs from the same class, such as terazosin or prazosin.
It is not suitable for individuals with a history of postural hypotension (a sudden drop in blood pressure upon standing).
The extended-release version of Cardura should be avoided in patients with severe gastrointestinal narrowing, chronic constipation, or a past history of bowel obstruction.
Possible side effects
Commonly reported side effects include lightheadedness, tiredness, nasal congestion, headaches, and swelling in the legs or ankles.
Some individuals may also experience rapid heartbeat, low blood pressure episodes, or drowsiness.
Rare but serious effects include fainting spells, prolonged and painful erections (priapism), or chest discomfort. Seek emergency care if any of these symptoms arise.
Drug interactions
Doxazosin may interact with the following substances:
Medications for erectile dysfunction (e.g., sildenafil, tadalafil)
Other antihypertensives including beta-blockers and ACE inhibitors
Diuretics (water pills)
NSAIDs such as ibuprofen (which may decrease the drug's effectiveness)
Alcohol (can increase drowsiness and hypotensive effects)
Always provide your physician with a full list of current medications, supplements, and herbal remedies to prevent dangerous interactions.
Missed dose
If you miss a scheduled dose, take it as soon as possible. However, if it's almost time for your next dose, skip the missed one and continue with your usual schedule. Do not double the dose.
Overdose
An overdose of Cardura may cause extreme fatigue, weakness, fainting, or a critical drop in blood pressure.
If overdose is suspected, contact emergency medical services immediately.
Storage
Keep Cardura at a stable room temperature (68° - 77°F / 20° - 25°C), protected from moisture, heat, and direct sunlight.
Always store the tablets in their original container and keep them out of reach of children and animals.
U.S. Sale and Prescription Policy
Within the United States, Cardura is classified as a prescription-only medication and approved by the FDA for treating both hypertension and benign prostatic hyperplasia. A valid prescription is typically required from a licensed physician or qualified healthcare provider.
Prescriptions are issued following proper evaluation, including blood pressure measurements and prostate health assessments. Follow-up visits are often necessary to monitor therapeutic response and adjust treatment as needed.
Generic versions (doxazosin) are broadly available and usually covered by health insurance plans. Online telemedicine platforms may also prescribe Cardura following a virtual consultation.
For eligible individuals, Frontier Family Pharmacy offers a secure and legitimate pathway to obtain Cardura without requiring a conventional prescription. This option is governed by internal verification protocols and complies with applicable regulatory standards. Availability may vary by state, and medical oversight is still strongly encouraged.