Vesomni is a single tablet holding two drugs: tamsulosin 0.4 mg and solifenacin 6 mg. The tamsulosin helps with voiding, the solifenacin with urgency and frequency. It is given to men whose symptoms are not sufficiently controlled by one drug alone.
Here is what I find interesting about it. This is the one prostate drug that tackles two opposite problems at once: a bladder that signals too early, and a urethra that resists too much.
Which is exactly why you need to know which of those two is your bigger complaint.
What is Vesomni and what is in it?
Vesomni is a modified-release tablet built from two layers. One layer holds solifenacin succinate 6 mg, the other tamsulosin hydrochloride 0.4 mg in OCAS form. It is licensed for moderate to severe storage symptoms alongside voiding symptoms in benign prostatic enlargement.
Solifenacin is an anticholinergic. It calms the bladder muscle so it contracts less readily.
Tamsulosin is an alpha blocker. It relaxes the muscle of the prostate and bladder neck so the channel widens. Two different targets, two mechanisms, one tablet. The Dutch Farmacotherapeutisch Kompas describes the combination as a next step after monotherapy.
Why two drugs in one tablet?
Because urinary symptoms in an enlarged prostate come in two groups that do not respond to the same drug. Storage symptoms are about your bladder: urgency, frequency, night-time urination. Voiding symptoms are about the channel: weak stream, dribbling, hard to start. Alpha blockers mainly address the second.
This distinction is the heart of the whole story, and it is rarely spelled out.
| Symptom group | What you notice | Where it comes from | Which half of Vesomni acts on it |
|---|---|---|---|
| Storage symptoms | Sudden urgency, frequency, night-time urination, sometimes leakage | Overactive bladder muscle | Solifenacin |
| Voiding symptoms | Weak stream, hard to start, dribbling, feeling not empty | Resistance at prostate and bladder neck | Tamsulosin |
If your problem is mainly a weak stream, tamsulosin alone is often the logical start. If you are up five times an evening with sudden urgency, that explains why an alpha blocker alone can fall short.
The NEPTUNE study examined this fixed combination in men with both symptom types and published efficacy and safety in European Urology in 2013 (PMID 23932438).
How these symptoms arise is in enlarged prostate: symptoms, causes and what your blood does and does not say.
What are the side effects of Vesomni?
You get the side effects of both drugs. From the solifenacin mainly a dry mouth and constipation, sometimes dry eyes and blurred vision. From the tamsulosin dizziness on standing, a blocked nose and a changed ejaculation. Dry mouth is the most reported complaint of the combination.
That dry mouth is not a detail. For many men it is the reason they want to stop.
Anticholinergics do not only calm your bladder muscle. They also slow salivary glands and bowel movement, because those respond to the same messenger. Hence the dry mouth and the constipation.
The side effects of the tamsulosin half are covered in tamsulosin side effects in men. On ejaculation: the 2014 Gacci meta-analysis shows the risk of ejaculatory dysfunction differs between alpha blockers (PMID 24708055).
The eye rule applies here too. Mention at cataract surgery that you take an alpha blocker, even if you stopped.
Can Vesomni actually stop you urinating?
That is the concern doctors keep an eye on with this combination. An anticholinergic calms the bladder muscle, and in a man with an enlarged prostate that could in theory cause urinary retention: your bladder no longer empties. In practice that risk turned out to be low with this combination.
A subanalysis of the NEPTUNE and NEPTUNE II studies looked at this specifically, following the incidence of urinary retention for up to a year in men on the fixed combination (PMID 28166296).
The reason the combination makes sense: the tamsulosin keeps the exit open while the solifenacin calms the bladder. That is not the same as giving an anticholinergic alone to a man with obstruction.
What you watch for yourself is simple. A full, painful feeling low in the abdomen while nothing comes out is a reason to contact a doctor straight away. Not tomorrow.
How does Vesomni differ from tamsulosin alone?
Tamsulosin alone addresses the channel and leaves your bladder muscle be. Vesomni does both. That means more effect on urgency, and the side effects of an anticholinergic alongside. For men without storage symptoms, the solifenacin mostly adds side effects.
Which makes "what kind of symptoms do I actually have" a more useful question than "which drug is stronger".
A concrete example. Two men aged 65 both have an enlarged prostate. The first has a stream like a hose with no pressure but can hold it fine. The second has a reasonable stream and runs to the toilet five times a day with sudden urgency. Same diagnosis, different symptom group, so a different conversation about medication.
What else is possible, from other alpha blockers to a 5-ARI, is in alternatives to tamsulosin. The full explanation of the tamsulosin half is in tamsulosin: how it works and what your doctor checks.
What to do with this
Split your symptoms into two columns before your next appointment. On the left everything about urgency and frequency, on the right everything about the stream. Count for a week how often each occurs.
That list is more useful than "I have prostate symptoms". It is precisely the information the choice between one and two drugs rests on.
To add your PSA to the picture you can order a PSA test. Note that neither tamsulosin nor solifenacin lowers your PSA, so you read that result as printed. What the value itself means is on our page about PSA.
Every Caliber blood test result includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP.
References
- van Kerrebroeck P, et al. Combination therapy with solifenacin and tamsulosin oral controlled absorption system in a single tablet for lower urinary tract symptoms in men: efficacy and safety results from the randomised controlled NEPTUNE trial. Eur Urol. 2013. PMID 23932438.
- Drake MJ, et al. Incidence of urinary retention during treatment with single tablet combinations of solifenacin plus tamsulosin OCAS for up to 1 year in adult men with both storage and voiding LUTS. PLoS One. 2017. PMID 28166296.
- Gacci M, et al. Impact of medical treatments for male lower urinary tract symptoms due to benign prostatic hyperplasia on ejaculatory function: a systematic review and meta-analysis. J Sex Med. 2014. PMID 24708055.
- Farmacotherapeutisch Kompas. Drug monograph tamsulosine/solifenacine. Accessed 2026. farmacotherapeutischkompas.nl.
Author
Caliberhealth
Dr. Naimi, BIG-registered physician, oversees the medical standards behind our content and assessments. Read our medical policy
