Terazosin: Side Effects, Uses & Monitoring
Terazosin hydrochloride capsules are indicated for the treatment of symptomatic benign prostatic hyperplasia (BPH).
- Data source
- FDA labeling via NIH DailyMed (label 2cfe38fe…)
- 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 | 9.1% |
| Nasal congestion | 5.9% |
| Headache | 5.8% |
| Postural hypotension | 3.9% |
| Urinary tract infection | 3.9% |
| Somnolence | 3.6% |
| Pain-extremities | 3.5% |
| Paresthesia | 2.9% |
| Sinusitis | 2.6% |
| Flu syndrome | 2.4% |
| Back pain | 2.4% |
| Nervousness | 2.3% |
| Nasal congestion/rhinitis | 1.9% |
| Tachycardia | 1.9% |
| Nausea | 1.7% |
| Dyspnea | 1.7% |
| Impotence | 1.6% |
| Blurred vision | 1.6% |
| Asthenia | 1.6% |
| Vertigo | 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)
Terazosin hydrochloride capsules are indicated for the treatment of symptomatic benign prostatic hyperplasia (BPH). There is a rapid response, with approximately 70% of patients experiencing an increase in urinary flow and improvement in symptoms of BPH when treated with terazosin hydrochloride. The long term effects of terazosin on the incidence of surgery, acute urinary obstruction or other complications of BPH are yet to be determined. Terazosin hydrochloride capsule is also indicated for the treatment of hypertension. It can be used alone or in combination with other antihypertensive agents such as diuretics or beta-adrenergic blocking agents.
Conditions associated with Terazosin in labeling
Frequently Asked Questions
What is Terazosin 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 Terazosin?
The table above shows adverse reactions and the highest frequencies reported in placebo-controlled trials summarized in current FDA labeling for Terazosin. Individual risk varies.
Does Terazosin require lab monitoring?
Monitoring needs vary. Ask your healthcare provider whether any lab tests apply while taking Terazosin.
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.