Comprehensive medication guide to Doxazosin including estimated pricing, availability information, side effects, and how to find it in stock at your local pharmacy.
Estimated Insurance Pricing
$0–$20 copay for generic doxazosin on most commercial and Medicare Part D plans; typically Tier 1–2. Brand Cardura XL may fall on a higher tier. Prior authorization is rarely required for the generic.
Estimated Cash Pricing
$88–$119 retail for a 30–90 count of generic doxazosin; as low as $10–$18 with GoodRx or SingleCare coupons for a 30-day supply. Brand Cardura XL costs $200–$257+ even with discount cards.
Medfinder Findability Score
88/100
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Doxazosin (brand names Cardura and Cardura XL) is a prescription medication belonging to a class of drugs called alpha-1 adrenergic blockers. It was first approved by the FDA in 1990 and has since become one of the most widely prescribed medications for benign prostatic hyperplasia (BPH) and hypertension. Generic versions are manufactured by multiple companies including Teva, Mylan, and Apotex.
Doxazosin is available in immediate-release tablets (1 mg, 2 mg, 4 mg, 8 mg) under the brand name Cardura, and as extended-release tablets (4 mg, 8 mg) under Cardura XL. The immediate-release form is FDA-approved for both hypertension and BPH. The extended-release Cardura XL is approved only for BPH and is not indicated for hypertension.
Because doxazosin treats two extremely common conditions — high blood pressure (affecting nearly half of U.S. adults) and BPH (affecting over 50% of men over age 60) — it is prescribed to millions of Americans each year and is included on most insurance formularies as a Tier 1 generic.
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Doxazosin is a selective alpha-1 adrenergic receptor antagonist — a quinazoline derivative that works by blocking alpha-1 receptors on smooth muscle cells throughout the body. These receptors are normally activated by norepinephrine, which causes muscle contraction and vessel narrowing. By occupying and blocking these receptors, doxazosin prevents norepinephrine from triggering contraction.
For hypertension: blocking alpha-1 receptors in blood vessel walls causes vasodilation (widening of vessels), reducing total peripheral resistance and lowering blood pressure. For BPH: blocking alpha-1 receptors in the prostate smooth muscle and bladder neck reduces the dynamic obstruction component — relaxing the muscle tone around the urethra, improving urine flow rate, and relieving urinary symptoms like urgency, frequency, and nocturia.
Doxazosin has a half-life of approximately 22 hours, allowing for stable blood levels throughout the day with once-daily dosing. The extended-release formulation (Cardura XL) uses a GITS (Gastrointestinal Therapeutic System) for even more gradual drug release, reducing peak concentrations and minimizing orthostatic hypotension risk. Doxazosin does not shrink the prostate — it only addresses the dynamic (muscle-related) component of urinary obstruction.
1 mg — tablet (immediate-release)
Starting dose for both BPH and hypertension; titrated up over 1-2 weeks
2 mg — tablet (immediate-release)
Intermediate titration dose
4 mg — tablet (immediate-release)
Common therapeutic dose for BPH; extended-release starting dose
8 mg — tablet (immediate-release)
Maximum dose for BPH; common therapeutic dose for hypertension
4 mg — extended-release tablet (Cardura XL)
Starting dose for BPH extended-release; take with breakfast
8 mg — extended-release tablet (Cardura XL)
Maximum dose for BPH extended-release; BPH only (not for hypertension)
16 mg — tablet (immediate-release, maximum hypertension dose)
Maximum daily dose for hypertension treatment (2 x 8 mg tablets)
Doxazosin has a findability score of 88 out of 100 — generally available with only minor stocking gaps at individual pharmacies. As of 2026, doxazosin is not listed on the FDA's Drug Shortage Database. Multiple generic manufacturers (Teva, Mylan, Apotex, and others) produce it, providing supply redundancy. Immediate-release generic tablets (1 mg, 2 mg, 4 mg, 8 mg) are stocked at most major pharmacy chains and available via mail-order.
The extended-release Cardura XL (4 mg, 8 mg) is harder to find than generic IR doxazosin — it's a brand-only formulation, less widely stocked, and patients prescribed Cardura XL may need to call ahead or use mail-order. Localized stockouts of specific IR strengths can occur at individual pharmacies but are generally resolvable by checking nearby locations.
If you're having trouble finding doxazosin at your pharmacy, medfinder calls pharmacies near your location to check which ones can fill your doxazosin prescription and texts you the results — saving you time on hold and helping you get your medication faster.
Doxazosin is not a controlled substance and requires no special DEA prescribing authority. It can be prescribed by any licensed healthcare provider in all 50 states. This makes access to doxazosin relatively straightforward through primary care and telehealth channels.
Primary care physicians (PCPs) / internists: The most common doxazosin prescribers for both hypertension and BPH management.
Urologists: Frequently prescribe doxazosin for BPH; manage moderate-to-severe BPH cases.
Cardiologists: May manage doxazosin as part of complex hypertension regimens.
Nurse practitioners (NPs) and physician assistants (PAs): Fully authorized to prescribe doxazosin independently in most states.
Geriatricians: Prescribe with caution given Beers criteria recommendations about orthostatic hypotension risk in older adults.
Telehealth is a convenient option for doxazosin refills and maintenance management in all 50 states. Platforms like Teladoc, MDLive, Amazon Clinic, and Sesame can prescribe doxazosin for established patients managing well-controlled BPH or hypertension. New patients initiating doxazosin typically benefit from an in-person evaluation for blood pressure measurement before starting.
No. Doxazosin is not a controlled substance and is not scheduled by the DEA. It has no known potential for abuse, dependence, or misuse. Doxazosin can be prescribed by any licensed healthcare provider — including physicians, nurse practitioners, and physician assistants — in all 50 states without special DEA authorization.
Prescriptions for doxazosin can be transmitted electronically, by phone, or by fax. Refills are not subject to the quantity or timing restrictions that apply to Schedule II–V controlled substances. Patients can receive 90-day supplies and use mail-order pharmacies without any restriction related to controlled substance rules.
The most common side effects of doxazosin involve blood pressure changes, particularly orthostatic hypotension (a drop in blood pressure upon standing). These are most pronounced during the initial dose and early titration period:
Dizziness and lightheadedness (especially upon standing)
Fatigue and somnolence
Headache
Ankle/foot edema (swelling)
Nausea
Rhinitis (runny or stuffy nose)
Syncope (fainting): Especially after first dose or dose increase. Call your doctor immediately.
Priapism: Prolonged, painful erection (>4 hours). Rare but requires emergency treatment to prevent permanent impotence.
Intraoperative Floppy Iris Syndrome (IFIS): Can complicate cataract/glaucoma surgery. Disclose to all eye surgeons.
Chest pain / angina: Call 911 if severe chest pain occurs.
Severe allergic reaction: Hives, difficulty breathing, facial swelling. Call 911.
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Terazosin (Hytrin)
Closest equivalent to doxazosin; FDA-approved for both BPH and hypertension; requires similar titration; generic only; slightly shorter half-life (~12 hrs) than doxazosin
Tamsulosin (Flomax)
Most commonly prescribed alpha blocker for BPH; uroselective (BPH only, not for hypertension); no titration required; widely available generic; higher IFIS risk than doxazosin
Alfuzosin (Uroxatral)
BPH-only alpha blocker; no titration; once daily with breakfast; fewer cardiovascular side effects; generic available
Silodosin (Rapaflo)
Highly selective alpha-1A blocker for BPH; brand-only (expensive); highest retrograde ejaculation rate; fewest cardiovascular effects
Finasteride (Proscar) / Dutasteride (Avodart)
5-alpha reductase inhibitors that shrink the prostate over months; different mechanism from alpha blockers; often used in combination with alpha blockers for severe BPH
Prefer Doxazosin? We can find it.
Vardenafil (Levitra)
majorContraindicated. Combined use can cause severe, life-threatening hypotension.
Sildenafil (Viagra) / Tadalafil (Cialis) / Avanafil (Stendra)
majorAdditive blood pressure lowering effect; can cause symptomatic hypotension. Use with caution; discuss with doctor.
Other antihypertensives (ACE inhibitors, ARBs, beta-blockers, CCBs, diuretics)
moderateAdditive hypotensive effects. Monitor blood pressure closely, especially at initiation and dose changes.
Clarithromycin (Biaxin)
moderateCYP3A4 inhibitor — increases doxazosin blood levels, enhancing both effect and side effects. Alternative antibiotic may be preferred.
NSAIDs (ibuprofen, naproxen)
moderateMay reduce doxazosin's antihypertensive effect through sodium retention. Monitor BP with regular NSAID use.
Alcohol
moderateEnhances blood pressure-lowering effect; increases risk of dizziness and orthostatic hypotension.
Yohimbe (herbal supplement)
majorPharmacodynamic antagonism / synergism — contraindicated with doxazosin.
Doxazosin is a well-established, affordable medication that offers a unique two-in-one benefit for men managing both high blood pressure and BPH. Its long half-life supports convenient once-daily dosing, and the wide availability of inexpensive generics makes it accessible to most patients on most insurance plans. While it requires careful dose titration at initiation, most patients tolerate it well once at their therapeutic dose.
For hypertension-only patients, current AHA/ACC guidelines favor other drug classes (ACE inhibitors, ARBs, calcium channel blockers, thiazides) as first-line agents. Doxazosin's role is strongest where both BPH and hypertension coexist, or as add-on therapy in resistant hypertension. The ALLHAT trial's finding of elevated heart failure risk compared to chlorthalidone reinforces this positioning.
If you're managing a doxazosin prescription and run into pharmacy availability issues, medfinder can call pharmacies near you to find which ones have your prescription in stock — saving you time and ensuring you stay on your medication without interruption.
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