Doxazosin: Side Effects, Uses & Monitoring
Benign Prostatic Hyperplasia (BPH)Doxazosin tablets are indicated for the treatment of both the urinary outflow obstruction and obstructive and irritative symptoms associated with BPH: obstructive symptoms (hesitation, i
- Data source
- FDA labeling via NIH DailyMed (label 05e29a60…)
- Label version
- current
- Last reviewed
- 2026
Reported adverse reactions
Reactions listed in current FDA labeling, with the highest frequency reported across summarized placebo-controlled trials.
| Adverse reaction (as reported in labeling) | Reported frequency* |
|---|---|
| Dizziness | 19% |
| Fatigue/malaise | 12% |
| Headache | 9.9% |
| Dizziness† | 9% |
| Somnolence | 3% |
| Rhinitis | 3% |
| Abdominal pain | 2.4% |
| Diarrhea | 2.3% |
| Urinary tract infection | 2.3% |
| Back pain | 2% |
| Pain | 2% |
| Vertigo | 2% |
| Nervousness | 2% |
| Sexual dysfunction | 2% |
| Polyuria | 2% |
| Micturition frequency | 2% |
| Fatigue | 1.7% |
| Dyspepsia | 1.7% |
| Nausea | 1.5% |
| Mouth dry | 1.4% |
*Highest percentage reported for the active moiety across placebo-controlled trial tables in current FDA labeling. Values reflect trial reporting, not your individual risk.
Labeled uses (from FDA prescribing information)
Benign Prostatic Hyperplasia (BPH)Doxazosin tablets are indicated for the treatment of both the urinary outflow obstruction and obstructive and irritative symptoms associated with BPH: obstructive symptoms (hesitation, intermittency, dribbling, weak urinary stream, incomplete emptying of the bladder) and irritative symptoms (nocturia, daytime frequency, urgency, burning). Doxazosin may be used in all BPH patients whether hypertensive or normotensive. In patients with hypertension and BPH, both conditions were effectively treated with doxazosin monotherapy. Doxazosin provides rapid improvement in symptoms and urinary flow rate in 66 to 71% of patients. Sustained improvements with doxazosin were seen in patients treated for up to 14 weeks in double-blind studies and up to 2 years in open-label studies. HypertensionDoxazosin tablets are also indicated for the treatment of hypertension. Doxazosin may be used alone or in combination with diuretics, beta-adrenergic blocking agents, calcium channel blockers or angiotensin-converting enzyme inhibitors.
Conditions associated with Doxazosin in labeling
Frequently Asked Questions
What is Doxazosin used for?
FDA labeling lists the approved uses shown above under "Labeled uses." This summary is informational; only a qualified prescriber can determine whether a medication is appropriate for you.
What are the most commonly reported side effects of Doxazosin?
The table above shows adverse reactions and the highest frequencies reported in placebo-controlled trials summarized in current FDA labeling for Doxazosin. Individual risk varies.
Does Doxazosin require lab monitoring?
Monitoring needs vary. Ask your healthcare provider whether any lab tests apply while taking Doxazosin.
Where does this information come from?
All clinical facts on this page were extracted from the current FDA-registered product labeling for this ingredient, published by manufacturers through NIH DailyMed. See the source link below.
Medical disclaimer: Educational content extracted from public FDA labeling. Not medical advice. Always consult a qualified healthcare professional before starting, stopping, or changing any medication.