Flomax
Flomax (tamsulosin) is a prescription alpha-blocker medication used primarily to treat the symptoms of benign prostatic hyperplasia (BPH), commonly known as an enlarged prostate. By relaxing the muscles in the prostate and bladder neck, it helps improve urine flow and reduces symptoms such as difficulty starting urination, weak stream, and frequent urination. It may also be prescribed to help with the passage of kidney stones.
Flomax is an alpha-blocker that relaxes prostate and bladder muscles to improve urinary symptoms in men with an enlarged prostate.
Key facts at a glance
- RxNorm
- 190283
- Generic
- Flomax
- Class
- brand-name
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- —
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Flomax is primarily used to treat benign prostatic hyperplasia (BPH), which causes urinary symptoms such as difficulty starting urination, weak stream, frequent urination, and the feeling of incomplete bladder emptying. It may also be prescribed off-label to help relax the ureter and facilitate the passage of kidney stones.
Flomax belongs to a class of drugs called alpha-1 adrenergic blockers (alpha-blockers). It works by blocking alpha-1 receptors in the prostate gland and bladder neck, causing the smooth muscles in these areas to relax. This relaxation reduces pressure on the urethra and allows for improved urine flow.
Flomax is typically taken once daily about 30 minutes after the same meal each day for consistent absorption. Common side effects may include dizziness, retrograde ejaculation, and orthostatic hypotension (a drop in blood pressure when standing up). Patients should rise slowly from sitting or lying positions. Before taking Flomax, patients should inform their doctor of all medications and health conditions, as it may interact with other drugs or cause complications in certain situations.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed July 26, 2026. · Read our editorial policy