Relaxes the prostate rather than shrinking it. Works within days, and there is one thing your eye surgeon must know.
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Tamsulosin is an alpha blocker. It relaxes the smooth muscle in the prostate and the neck of the bladder, which widens the outflow and makes passing urine easier.
It does not shrink the prostate — that is what finasteride does. The two work differently and are often used together, and knowing which yours is doing explains a lot about what to expect.
Once daily, after the same meal each day — usually breakfast. Consistency matters because food affects absorption.
Swallow modified-release capsules whole. Do not crush or chew.
The first dose can cause a marked drop in blood pressure on standing, so many people are advised to take it at bedtime initially. Get up slowly for the first few days.
It works quickly by the standards of prostate treatment — symptoms usually improve within days to a couple of weeks, unlike finasteride which takes up to six months.
Common: dizziness, particularly on standing, and especially with the first few doses. Also headache, fatigue, and a blocked or runny nose.
Retrograde ejaculation is the one men are least often warned about and most bothered by. Semen passes backwards into the bladder rather than out, so ejaculation becomes dry or much reduced. It is harmless, it is reversible on stopping, and it is not the same as erectile dysfunction — but discovering it unexpectedly is unsettling, and it is a common reason men quietly stop the drug without saying why.
Less commonly: palpitations, and rarely a prolonged erection needing emergency attention.
The most important practical warning is about eye surgery. Tamsulosin causes intraoperative floppy iris syndrome, which makes cataract surgery technically more difficult and riskier if the surgeon does not know in advance.
Tell your ophthalmologist you take tamsulosin — or have ever taken it — before any cataract or eye surgery. Stopping it beforehand does not reliably prevent the effect, so what matters is that the surgeon knows and can plan for it.
PDE5 inhibitors such as sildenafil — both lower blood pressure, and the combination can cause dizziness or fainting. Doses are often separated in time, and this combination is common enough to be worth flagging.
Other interactions: other blood pressure medicines, some antifungals, clarithromycin, and diltiazem or verapamil.
Before starting: PSA and assessment to exclude prostate cancer. Urinary symptoms should never simply be treated without establishing the cause — tamsulosin will relieve the symptoms of a cancer just as readily as those of benign enlargement.
Kidney function and a urine test are usually checked.
Yes, where clinically appropriate, and prostate symptoms assess reasonably well remotely using a structured symptom score.
What that involves: a proper history using the IPSS score, PSA, kidney function, urine testing, and consideration of the things that are not the prostate at all — diabetes, medication side effects, and fluid or caffeine intake late in the evening all cause the same symptoms.
Where in-person assessment is still needed: a digital rectal examination is part of a complete prostate assessment and cannot be done remotely by anyone. We will tell you clearly when that is required rather than leave you assuming the remote review covered everything.
Urgent referral rather than a prescription for blood in the urine, complete inability to pass urine, or a suspicious PSA.
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Tamsulosin is a cheap generic. On a private prescription the drug cost plus dispensing fee is usually comparable to the England NHS prescription charge of around £10, and NHS prescriptions are free in Wales.
A lower-dose version is available from pharmacies without a prescription for men aged 45 to 75 after a pharmacist consultation, with a review at six weeks and twelve months. For straightforward symptoms that is a reasonable and inexpensive starting point.
On the assessment rather than the tablet. Urinary symptoms in men are not all prostate, and treating them as though they are is how other things get missed.
A PSA, kidney function, urine testing and a structured symptom score cost more than the drug and matter more.
Tamsulosin relaxes muscle; it does not shrink the prostate. Symptoms return within days to weeks of stopping, because nothing structural has changed.
Finasteride is the drug that shrinks the gland, and it takes around six months to do so. The two are often combined for that reason.
If you are having cataract surgery, or any eye surgery, tell the surgeon you take tamsulosin — even if you stopped it years ago.
It causes intraoperative floppy iris syndrome, which makes the operation considerably more difficult and riskier if the surgeon is not expecting it. Forewarned, they adapt the technique and the outcome is fine.
Stopping the drug beforehand does not reliably prevent it, which is exactly why telling them matters more than stopping.
Take the first dose at bedtime. Dizziness on standing is commonest early on.
If you miss several days, restart at bedtime again rather than resuming mid-morning — the first-dose effect returns after a gap.
Retrograde ejaculation — little or no semen — is common, harmless and reversible on stopping, but it is a legitimate reason to change if it bothers you. Alternatives exist.
If symptoms do not improve within four to six weeks, tamsulosin is unlikely to be the answer and the diagnosis is worth revisiting.
Retrograde ejaculation — semen goes backwards into the bladder instead of forwards. It is common with tamsulosin, harmless, and reverses if you stop.
It is alarming if nobody warns you, and it does affect fertility while you take it.
Tamsulosin causes floppy iris syndrome during cataract surgery, which complicates the operation if the surgeon does not know.
Tell them even if you stopped taking it years ago — the effect persists, and stopping beforehand does not reliably prevent it.
No. It relaxes the muscle in the prostate and bladder neck, easing flow without changing the size.
Finasteride shrinks the gland, over about six months.
Often within days, and fully within two to four weeks.
If nothing has changed by six weeks, it is probably not the right treatment and the diagnosis deserves another look.
Because dizziness on standing is commonest with the first doses. Being in bed when it happens is safer.
The same applies if you restart after a break.
Tamsulosin does not affect PSA, unlike finasteride which halves it.
Urinary symptoms should be assessed before treatment starts, not treated on assumption.
Usually yes, with care — both lower blood pressure, so dizziness is more likely.
Mention it, and start cautiously.
Usually, while the symptoms persist, since it treats the symptom rather than the enlargement.
It is reasonable to trial stopping periodically to see where things stand.
If you cannot pass urine at all and the bladder is painfully full, go to A&E. Acute retention needs a catheter, not a tablet.
Blood in the urine, fever with back pain, or weight loss also need prompt assessment rather than a repeat prescription.
Clinically reviewed by Dr Mohammad Zubair Khan, GMC 7563469
Last reviewed
August 24, 2026
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