Tamsulosin is one of the medicines urologists prescribe most often. It helps men with an enlarged prostate pass urine more easily, and it is also used to help stones in the ureter pass. This guide explains how it works, how it is usually taken, its side effects and the precautions that matter.
How tamsulosin works
Tamsulosin is an alpha-1 blocker. It relaxes the smooth muscle in the prostate, bladder neck and lower ureter. Relaxing the prostate makes the urine stream stronger; relaxing the ureter helps a stone slide down into the bladder.
What tamsulosin is used for
- Enlarged prostate (BPH): weak stream, frequent urination and waking at night. See enlarged prostate treatment.
- Ureteric stones: as “medical expulsive therapy” to help stones in the lower ureter pass, usually for a few weeks.
- Comfort with a stent: sometimes prescribed to reduce stent discomfort after stone surgery.
Usual dose
The common adult dose is 0.4 mg once a day, taken about 30 minutes after the same meal each day. Swallow the capsule whole; do not crush or chew it. Your doctor may combine it with other medicines, such as dutasteride for larger prostates. For stones, it is usually given for up to about four weeks.
Side effects
| Side effect | What to do |
|---|---|
| Dizziness or light-headedness on standing, especially after the first doses | Stand up slowly; take it at the same time daily; avoid driving if dizzy |
| Reduced or absent semen at ejaculation (retrograde ejaculation) | Harmless and reversible on stopping; mention it if it bothers you |
| Blocked or runny nose, headache | Usually mild |
| Fainting, chest pain, a severe rash or a painful prolonged erection | Seek medical help promptly |
Important precautions
- Cataract or glaucoma surgery: tell your eye surgeon you take (or have taken) tamsulosin, because of a condition called floppy iris syndrome.
- Blood pressure medicines and ED tablets: together they can lower blood pressure further; ask your doctor.
- Raised PSA or prostate cancer concerns: tamsulosin treats symptoms but not cancer, so screening still matters.
When tamsulosin is not enough
For BPH, if symptoms remain bothersome, or you develop retention, infections or bladder stones, surgery such as HoLEP may be better than lifelong tablets. For stones, a stone that has not passed after a few weeks, or any stone with fever, needs URS laser treatment.
This guide is for general information. Take tamsulosin only as prescribed by your doctor.
Frequently asked questions
How quickly does tamsulosin work?
Urine flow often improves within a few days to two weeks. For stones, it is usually tried for up to about four weeks.
Can women take tamsulosin?
Doctors sometimes prescribe it to women to help ureteric stones pass. This is decided case by case.
Can I stop tamsulosin suddenly?
For BPH, symptoms usually return when it is stopped. Speak to your doctor before stopping.