Tamsulosin

What is tamsulosin?

Tamsulosin is an alpha-1 blocker class medication. Mainly, it is used to treat symptoms caused by an enlarged prostate (benign prostatic hyperplasia, or BPH). It works by relaxing the muscles in the prostate and bladder neck, making it easier to urinate, and is usually available under brand names such as Flomax and Contiflo XL[1]. 

What is tamsulosin used for?

Tamsulosin is used to relieve symptoms of Benign Prostatic Hyperplasia (BPH). These may include having difficulty starting urination, a weak or interrupted urine stream, frequent or urgent need to urinate, and the feeling of incomplete bladder emptying. In some cases, it may be prescribed to help pass small kidney stones by relaxing the urinary tract[1]. 

How does tamsulosin work?

Tamsulosin blocks alpha-1 (specifically alpha-1a) receptors found in the smooth muscle of the prostate and bladder neck. By relaxing these muscles, it improves urine flow and reduces bladder outlet obstruction. Other results include the easier passage of kidney stones (in strictly off-label use), and a reduction in urinary symptoms without shrinking the prostate. While it treats symptoms, tamsulosin does not cure BPH or reduce prostate size[1]. 

Who can take tamsulosin?

Tamsulosin is suitable for adult men diagnosed with BPH. However, it may not be suitable for people with severe liver impairment or kidney problems, significant low blood pressure, or a history of fainting or dizziness. Tamsulosin is also generally not used if you have planned cataract or glaucoma surgery, due to the risk of Intraoperative Floppy Iris Syndrome (IFIS)[1]. 

Tamsulosin is not typically prescribed for women or children. In rare cases, it may be used off-label for specific urological conditions under specialist guidance[1]. 

Please tell your doctor or pharmacist about any conditions you may have before you start treatment, and always follow the instructions in the Patient Information Leaflet[2]. 

What is the typical dosage of tamsulosin?

The usual dose of tamsulosin is 400 micrograms (0.4mg) once daily. If symptoms do not improve, your doctor might consider increasing this to 800 micrograms (0.8mg). Always follow your doctor’s or pharmacist’s instructions and do not change your dose without medical advice[1]. 

How do you take tamsulosin?

Most people take tamsulosin once daily, 30 minutes after the same meal (usually breakfast or the first meal of the day). It’s best to swallow the capsule whole with water – do not crush, chew, or open it. Taking tamsulosin at the same time each day helps maintain a consistent effect[1]. 

Can you stop taking tamsulosin suddenly?

You shouldn’t stop taking tamsulosin suddenly without speaking to your doctor or pharmacist. Stopping may cause symptoms to return or worsen. If you are scheduled for eye surgery, especially cataract surgery, tell your surgeon well in advance that you are taking tamsulosin, as it can affect the muscles in the eye[1]. 

What should you do if you take too much tamsulosin?

The symptoms of tamsulosin overdose are typically severe dizziness, fainting, or low blood pressure. If you take more than the prescribed amount, seek emergency medical help immediately[1].  

What should you do if you forget a dose of tamsulosin?

If you forget to take a regular dose of tamsulosin, take it as soon as you remember provided it's at least several hours before your next dose is due. If it’s almost time for your next dose, skip the one you missed and carry on as normal. It’s important not to take two doses at once[1]. 

When taking tamsulosin, it’s a good idea to try and take it at the same time each day. This can help with consistency and avoid missed doses[1]. 

Which medicines should you avoid while taking tamsulosin?

Tamsulosin can interact with several other medications. For that reason, you should tell your doctor or pharmacist about all other medicines you are taking, especially[1]: 

• Other alpha-blockers (e.g., doxazosin, terazosin) 

• Blood pressure medicines 

• Erectile dysfunction drugs (e.g., sildenafil, tadalafil) 

• Antifungals (e.g., ketoconazole, itraconazole) 

• Antibiotics (e.g., erythromycin, clarithromycin) 

• Herbal supplements, especially St. John’s Wort 

Combining tamsulosin with these medicines can increase the risk of a severe drop in low blood pressure or other side effects[1].  

Always inform your doctor or pharmacist about all medications and supplements you take before you start a new medicine, and follow the instructions in the Patient Information Leaflet[2]. 

What are the side effects of tamsulosin?

The most common side effects of tamsulosin are dizziness or light-headedness – especially when standing up (postural hypotension). You may also experience a runny or blocked nose, or changes in ejaculation, such as reduced semen volume or retrograde ejaculation (where semen enters the bladder), including reduced semen release[1]. 

The more serious but rarer side effects involve fainting, a severe drop in blood pressure, allergic reaction (rash, itching, swelling of the face or throat), or priapism (a painful, prolonged erection lasting more than 4 hours which requires urgent treatment to prevent permanent damage)[1]. 

Let your doctor or pharmacist know if any side effects become troublesome or persistent. If you experience severe side effects, contact a medical professional immediately. 

If you experience any side effects, including those not listed, you are encouraged to report them via the Yellow Card Scheme or contact your doctor, pharmacist, or nurse. This information is intended as a summary for general awareness and does not replace professional medical advice.

The information provided in the side effects section is not a comprehensive list of all possible side effects associated with this medication. For a complete list of side effects, please refer to the Patient Information Leaflet (PIL) provided with your medication or consult your healthcare professional[2]. 

Frequently asked questions about tamsulosin

Can women take tamsulosin? 

Tamsulosin is not usually prescribed for women. But in rare cases, it may be used off-label to treat conditions like urinary retention or bladder outlet obstruction under specialist care[1]. 

How long does tamsulosin take to work? 

When starting tamsulosin, some men notice improvement within a few days. However, the full effects may take 2 to 4 weeks to register[1]. 

Can I drink alcohol while taking tamsulosin? 

Alcohol can significantly increase the risk of dizziness or fainting caused by tamsulosin. As such, when taking tamsulosin, it’s best to limit or avoid alcohol especially when starting treatment or if you experience dizziness[1]. 

Will tamsulosin cure BPH? 

While tamsulosin effectively manages symptoms, BPH itself may still progress over time. Regular check-ups with your doctor are important[1].

For the official NHS guide to tamsulosin, visit their website.