The Independent Pharmacy

Common Side Effects Of Tamsulosin

Scott McDougall
Scott McDougallMPharmDirector & Registered Manager

Reviewed on 7 Nov 2023

Tamsulosin is a type of medicine known as an 'alpha-blocker,' which is commonly used to treat a condition where the prostate gland is enlarged, a situation known as benign prostatic hyperplasia, or BPH for short. Most people take tamsulosin without any problems. But it's important to be aware of some side effects that could happen so you're prepared and know when to seek help.

The most frequently reported tamsulosin side effects include:

  • Abnormal ejaculation (retrograde ejaculation)
  • Dizziness
  • Headache
  • Nasal congestion
  • Diarrhoea
  • Back pain

Less common side effects, occurring in 1-5% of patients, include rash, insomnia, fatigue, chest pain, urinary retention (when you can't empty all the urine from your bladder), urinary tract infection, upper respiratory infection, cough, flu symptoms, sinusitis, nausea, and dry mouth.

Serious side effects are rare but can include severe low blood pressure, serious skin reactions, and priapism (an erection that lasts more than 4 hours). You should seek immediate medical attention and call 999 if you experience signs of these.

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In-Depth Look at Common Side Effects

Tamsulosin helps relieve urinary symptoms for many men, but it can also cause some unwanted side effects. Being aware of the more common reactions can help you know what to watch out for and when to seek medical advice.

Abnormal Ejaculation

You may notice that semen doesn't come out during orgasm like it normally does, or the amount released is reduced. This happens when tamsulosin relaxes certain muscles, causing semen to go into the bladder instead of out of the body during orgasm (this is also called retrograde ejaculation). Smooth muscle control is needed for semen to be propelled out as usual during sex. Older men taking higher doses of tamsulosin for longer periods tend to be most affected. Timing, when you take your dose to avoid peak levels during planned sexual activity, can help. Pelvic floor muscle training may also help strengthen important muscles for ejaculation.


Feeling lightheaded, woozy or unsteady is common with tamsulosin. It can lower your blood pressure, which might make you feel dizzy or lightheaded. A drop in blood pressure causes dizziness. Older individuals, people already prone to low blood pressure, and those on other blood pressure medications are most at risk. To help avoid episodes, try slowly moving from lying down to standing.


Some people notice more frequent or severe headaches when taking tamsulosin. These can range from nagging tension-type headaches to moderately intense migraines. Exactly why headaches happen is unclear. It could involve relaxation of blood vessels in the brain. People prone to headaches seem more susceptible. Staying hydrated, limiting caffeine and alcohol, and taking OTC pain relievers to ease symptoms are useful for many.

Nasal Congestion

Tamsulosin can make your nose and sinuses feel stuffy and inflamed. It causes constriction of the tiny blood vessels that supply the membranes in your nasal passages. If you already suffer from chronic sinus or nasal problems, the congestion may worsen. Nasal strips, saline spray, decongestants and antihistamines can provide some symptom relief.

Tips to Handle Those Annoying Side Effects

We all know how frustrating it can be dealing with medication side effects. Thankfully, there are several simple and effective ways to manage these side effects, and we're here to guide you through them. Here are some ideas to try:

  • Take your dose after breakfast or dinner every day - keeping it consistent helps your body adapt.
  • Hydration is key! Drink lots of water and fluids so you don't get dehydrated.
  • When you start taking tamsulosin, your doctor may prescribe a lower dose and then slowly increase it to help your body adjust without too many side effects.
  • If you forget a dose, take it as soon as you remember - but not if it's close to the time for your next one.
  • Carry glucose tablets or candies in case side effects like headaches leave you feeling drained and your blood sugar drops.
  • Take it slow and easy when getting up from sitting or lying down since tamsulosin can make you feel lightheaded.
  • Avoid drinking alcohol, which can worsen some common side effects.
  • Jot down any side effects in a journal to spot patterns - share this with your doctor.
  • Speak to your doctor if side effects persist or concern you - they may adjust your dosage or switch your prescription.
  • It's really important not to stop taking tamsulosin on your own because doing so can cause problems. If you're considering stopping, please talk to a healthcare professional first so they can ensure it's done safely.

Trying a few of these tips can really help take the edge off those tamsulosin side effects so you get the prostate benefits without all the hassle.

Watch Out for These Serious Reactions

While most guys only experience minor side effects from tamsulosin, it can occasionally cause some serious reactions. Here are the major ones to watch out for:

If you notice any signs of these rare but dangerous tamsulosin side effects, call 999 or seek emergency care right away. Also, call your doctor's office so they can advise you further and monitor your case.

It's useful to carry a medical alert card in your wallet listing the medications you take in case of an emergency room visit. Promptly reporting any serious reactions can help healthcare professionals provide the correct treatment.

It can be worrying to hear about severe reactions, but please remember they are very rare and help is available if you need it. Still, being aware of the symptoms and getting timely care is important, just in case.

What to Expect Long-Term

When first starting tamsulosin, side effects tend to be most noticeable. But what should you expect down the line with ongoing treatment?

In most men, early side effects like dizziness and abnormal ejaculation tend to improve over time. Your body adjusts to tamsulosin within 2-4 weeks. However, some effects like retrograde ejaculation persist long-term for many users.

Ongoing long-term use does not seem to increase risks for side effects. But always take the minimum effective tamsulosin dose to balance symptom relief and side effects.

It's wise to consult your doctor at least yearly while on tamsulosin. Report any persisting side effects. They can evaluate your prostate health, adjust medications if needed, and check for potential drug interactions with any new medications.

Some men use tamsulosin for years to manage enlarged prostate symptoms. Monitoring side effects and getting regular check-ups allows safe, continued use for symptom relief.

Tamsulosin Myths Versus Facts

We know there's a lot of information online, and it can be overwhelming to figure out what's true about tamsulosin's side effects. We're here to help clear up any confusion. It can be tricky separating myths from realities. As your helpful guide, let us debunk some biggest misconceptions out there:

Tamsulosin causes erectile dysfunction. Tamsulosin does not directly cause ED, though retrograde ejaculation can contribute in some men.
Tamsulosin always leads to severe low blood pressure. A serious drop in blood pressure is rare when tamsulosin is taken according to the doctor's instructions.
Tamsulosin should not be taken long-term. Many men safely use tamsulosin for years to manage enlarged prostate symptoms.
Tamsulosin causes urinary retention. Urinary retention is very rare, and tamsulosin usually improves urine flow.
Taking tamsulosin means you have prostate cancer. Tamsulosin treats benign prostate enlargement, not prostate cancer.

The bottom line - be wary of drug myths online. Always consult your own doctor or legitimate medical sites for the real facts on tamsulosin. With the right information, you can use it effectively and safely.

Your Next Steps With The Independent Pharmacy

We understand that reading about potential side effects might make you hesitant about continuing treatment. It's okay to feel this way, and we encourage you to discuss any concerns with your doctor.

And remember, you're not alone in dealing with frustrating prostate symptoms. At The Independent Pharmacy, our experts have got your back. Give us a shout to talk one-on-one about what adverse effects to realistically expect, get advice to handle them, and explore alternate treatment options if tamsulosin isn't cutting it for you. No need to struggle solo - we're here to help guide you towards suitable solutions tailored to your needs.

Stay in the driver's seat by tracking your side effects, getting regular checkups, and speaking up about issues early. Working as a team with your healthcare providers, we can get your symptoms under control so you can feel better and get your life back.

Take an empowered step for your health today by reaching out - together, we can handle this enlarged prostate situation.

Frequently Asked Questions

Still, have some lingering questions about tamsulosin side effects? Here are answers to some common FAQs:

What does tamsulosin do to your body?

Tamsulosin helps improve the weak stream of urine by relaxing the muscles around the bladder and prostate, which can be helpful if those muscles are tight due to an enlarged prostate. It also reduces nerve signals in the bladder, allowing it to fill better.

Does tamsulosin have long-term side effects?

Most side effects diminish over time, but retrograde ejaculation persists long-term for many users. Ongoing monitoring by a healthcare professional is recommended.

How long should a man take tamsulosin?

Many men safely use tamsulosin for years under medical supervision. Your doctor will aim to prescribe the lowest dose that still helps your symptoms to reduce the chance of side effects.

Is tamsulosin a high-risk medication?

When used as directed, tamsulosin has a relatively mild side effect profile. However, severe low blood pressure is possible in some individuals.

Does tamsulosin make you pee more or less?

Tamsulosin improves urine flow rates and empties the bladder more fully, reducing frequency and urgency.

Why does tamsulosin stop you from ejaculating?

It relaxes the bladder neck muscle, allowing semen to flow backwards into the bladder instead of outward during orgasm.

What foods should I avoid with tamsulosin?

Avoid grapefruit and grapefruit juice, which can increase tamsulosin levels in the body and worsen side effects.

Can tamsulosin affect bowel movements?

Yes, diarrhoea or constipation are possible side effects. Stay hydrated and eat a high-fibre diet to minimise risk.


Benign prostate enlargement - NHS (

Side effects of tamsulosin - NHS (

Adverse Effects of Pharmacological Therapy of Benign Prostatic Hyperplasia on Sexual Function in Men - PubMed (

Common questions about tamsulosin - NHS (

A Case of Mucosal Fixed Drug Eruption Caused by Tamsulosin Administration - PMC (

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