Can Flomax Shrink an Enlarged Prostate?

by Ben Ong
Reading Time: 5 minutes
enlarged prostate flomax

An enlarged prostate (also known as benign prostatic hyperplasia) is a condition that will affect most men throughout their lifetime. It is one of the most common health problems for men over the age of 50, and as you age, you are more likely to develop prostate enlargement. More than 90% of men over the age of 80 have this condition.

What Is An Enlarged Prostate?

Benign Prostatic Hyperplasia (BPH) occurs when the prostate, expands to twice or even three times its regular size. The growing prostate gland gradually presses against the urethra and often affects the way you urinate and the flow of urine.

As a result, the bladder muscle becomes stronger, thicker and more sensitive, causing it to contract. This results in more frequent urination, and as the urethra becomes increasingly narrowed, the urine remains in the bladder, accounting for urinary problems.

If you have an enlarged prostate, you may have come across the drug Flomax (generic name: Tamsulosin). Your Doctor might have prescribed it, having told you that it will relieve your BPH urinary symptoms.

However, a note of warning. While It may seem like the perfect drug if you have an enlarged prostate, a staggering amount of research has highlighted worrying side effects.

This in-depth report will take a closer look at Flomax (tamsulosin hydrochloride) and to what extent does its harm, rather than improve your prostate health.

Flomax: History & Background 

In the late 1970s, an α-blocker named phenoxybenzamine demonstrated beneficial effects in treating the symptoms of BPH (benign prostatic hyperplasia). However, although it showed benefits, around 30% of users experienced severe side effects. Furthermore, the drug has been identified as a potentially strong carcinogen (Ramirez 2014).

enlarged prostate flomax

Flomax (also known as Tamsulosin), became available to the market in 1996 and was showcased as a breakthrough drug.

It was revealed to have fewer side effects than phenoxybenzamine, the popular alpha blocker that was initially prescribed for Benign Prostatic Hyperplasia (BPH).

How Does Flomax Work?

Flomax is now the most commonly prescribed drug for men with BPH symptoms, but how does it work?

Alpha blockers work by binding to alpha-adrenergic receptors which prevent the receptor from being stimulated.

This prevents the transmission of nerve impulses and causes smooth muscles in the prostate, bladder, and arterioles to relax, enabling urine to flow more freely and alleviating bladder outlet obstruction.

As a result, men may experience an improvement in BPH signs and symptoms, such as the urge to urinate, luts (lower urinary tract symptoms and urinary retention.

Is Flomax Safe, Does It Have Side Effects?

Commonly reported side effects of Flomax to include: dizziness or fainting, low blood pressure, nasal congestion, rhinitis, rhinorrhea, sinus congestion, seasonal allergic rhinitis, and even drowsiness.

It is highly likely that current research underestimates both the number of these side effects, as well as their seriousness.

The research conducted around this drug is kept from the public, providing very little information about the dangerous effects of Flomax.

A pharmacologist revealed in 2014 that over 75% of registered trials for Flomax were hidden, which is a very worrying statistic. Therefore, the exact effects that this drug could have on your body remain unknown to the public.

Flomax side effects


A significant cause for concern is severe hypotension, which has rarely been reported in clinical trials.

Alpha blockers, especially untargeted ones such as tamsulosin, relax the smooth muscles in the heart which leads to low blood pressure. (Flomax should not be used to treat high blood pressure).

enlarged prostate flomax

A cohort study involving 14,784 men that used an alpha-blocker from 2003 to 2013 were compared to an equal number of men who decided against the use of alpha blockers, to examine whether alpha blockers increased the risk of falling.

This is because it has been suggested that hypotension can result in dangerous falls, fractures or head injuries.

The use of alpha-blockers increased fall risk by 14% compared to men that did not use alpha-blockers.

Cataract Surgery

enlarged prostate flomax

If you are going to have cataract surgery, then it is essential that you avoid the use of Flomax.

Flomax has been shown to cause complications during cataract surgery and result in floppy eye syndrome (Pärssinen, 2006).

Further Side Effects

Further studies have also outlined other potential risk of taking the drug. A Cochrane systematic review looked at the effects of Flomax for BPH in 2003.

The analysis involved 14 studies that ranged from 1 to 6 months long. The study participants described improvements in symptoms. However, they also found 37 adverse side effects and 63% reported some form of side effect.

Side effects that were reported included erectile dysfunction, retrograde ejaculation, and reduced libido.

enlarged prostate flomax

In another 4-year study, 27% of participants dropped out due to the small improvement in symptoms, while 17% dropped out due to side effects.

The most common side effects were dizziness, abnormal ejaculation, asthenia, hypotension, erectile dysfunction, and headaches.

Does Flomax Alleviate Symptoms?

Evidence suggests that Flomax is moderately effective at best. Patients taking Flomax or considering taking Flomax should be made aware that taking this medication means that symptoms are unlikely to go completely.

The size of the prostate is a determinant on the effectiveness of Flomax. The drug is notably less effective when the prostate is larger.

Finally, it should be noted that a clear majority of the research around this drug remains unpublished. As a result, it is likely that available evidence overestimates its overall effectiveness.

Does Flomax Shrink And Heal The Prostate?

enlarged prostate flomax

Alpha-blockers do not improve clinical outcomes of BPH or slow down the growth of the prostate, and Flomax is no exception.

A 2008 study found that prostate size did not change, and PSA levels increased by 12.1% over two years of Flomax use.

Prostate cancer was reported in 26 men that were receiving Flomax. This is not surprising, with research indicating that BPH may increase prostate cancer risk.

Naturally Treat An Enlarged Prostate

When it comes to treating prostate problems, natural is the way to go. That’s why Ben’s Total Health contains 23 powerful herbal ingredients combined in one supplement designed to supercharge your prostate treatment.

Prostate cancer rates are higher than ever before, and sadly many men are unknowingly relying on dangerous prostate drugs with life-wrecking side effects.

With natural, herbal remedies you can treat your prostate naturally, safely and with no nasty side effects.


Based on the research (or lack of it), and the fact that there are other more effective alpha blockers available with fewer side effects, patients may wish to consider avoiding Flomax altogether.

It has also been identified as a carcinogen, as well as linked to macular degeneration in the form of Floppy Iris Syndrome.

Overall, the vast majority of industry-funded studies on Flomax remain unpublished. Independent studies raise questions about the efficacy and safety of this medication. Its high rate of side effects and low efficiency means patients may wish to consider alternative treatments.

Can Flomax Shrink an Enlarged Prostate?
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About Ben Ong

Ben Ong is a best-selling author and widely regarded as one of the world’s leading experts on natural treatments for metabolic conditions such as prostate disease and type 2 diabetes. He founded Ben’s Natural Health and has worked for over 20 years providing a range of high quality, clinically effective, all-natural supplements for BPH, high PSA, high blood sugar, sexual dysfunction, and others.
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  1. Richard Foll

    I had problems with cataract surgery after taking Tamsulosin for over 7 years. My left eye had to have stitches to close up after the new lens was installed. The right eye had no problems. I wish I had never taken Tamsulosin. The eye Doctor said once you start with the medicine the damage is there and will not go away. My Urologist said he never heard of any effect. ?????

    • Ben Ong

      Hi Richard, very sorry to hear about your experience with Tamsulosin if you would like to discuss this in further detail please get in touch with our team via [email protected]

  2. Allen E. Ardisson

    I have been on it for a couple years and the one side effect that I experience is when reaching a climax and orgasm ejaculations produce NO sperm ! Where is it going and that seems totally unnatural to me !!!!

  3. Ray. Young

    I am on Tamalosin and have been for many years, i have rhinitis and skin problems. I use a catheter at night. I had radiotherapy i 2010.
    Can i safely give up Tamalosin?

    • Ben Ong

      Hi Ray, to discuss this in further detail please get in touch with our team via [email protected] or call our toll free number 1-888-868-3554 in the US and +44 (0) 845 423 8877 in the UK and they will be happy to speak with you. The Ben’s Natural Health Team.

  4. Russell Marsh

    I had a TURP procedure 10 years ago. It worked great and for extra insurance I started using Prostate Revive. All fine up to a year ago and Prostate Revive began to lose its effectiveness. Dr. put be on Finasteride. It does not seem any better then Prstate Revive

  5. dave

    Please do similar article on side effects Avodart and Proscar. I have been prescribed all 3, Proscar having the least side effects that I notice (the only one I have stuck with), the other 2— I could not carry on with.

  6. Ronald Siedler

    I took Flomax for 11 years, between the ages of 66 and 77. The only side effect that might have occurred was a lessened libido/potency. The alpha adrenergic drug without a doubt does what it’s supposed to do. None of the other side effects that were mentioned. However, after 11 years a tolerance had built up to the extent that I couldn’t even insert a catheter after 3 weeks of using such a device. A rush to a hospital for the HoLEP saved me.

  7. Jim Ridgeway

    Thank you for your study of this problem. I am currently on flomax , and experienceing some of these side effects.

  8. John Lafonte

    taking flow max for 20 years I have to assume the damage has been done, If I quit now what can I expect will happen to my prostrate and my EDF??

    • Ben Ong

      Hi John, to discuss this in further detail please get in touch with our team via [email protected] or call our toll free number 1-888-868-3554 in the US and +44 (0) 845 423 8877 in the UK and they will be happy to speak with you. The Ben’s Natural Health Team.

  9. ron mcmahon

    extremely expensive…. you should have a trial size to let someone see if it is effective.effective

  10. Joe Oghoyone

    I bought your total health and found the vitamin E content as very high 400mg. Vitamin E in many studies have been queried for increasing risk of prostate cancer. I will advice you review the vitamin E content. I also bought total healer. I couldn’t continue after first dose. It is too harsh to the stomach and contains alcohol that should be avoided if you suffer from bph and worst if you suffer from prostate cancer.

    • Ben Ong

      Hi Joe, men taking selenium and Vitamin E together did see a small increase in prostate cancer risk, however that increase in risk was so small that it fell well below the threshold for statistical significance. There are a multitude of studies showing the prostate health benefits of both Vitamin E and Selenium and so we still recommend them as vital health supplements. Also, it is important to note that the study used dl-alpha tocopheryl and we recommend mixed tocopheryls, which are very different. The select trial is a single piece of research and we view it in the context of all of the other research into these nutrients. Overall we remain convinced by the scientific consensus that there are general and prostate-specific health benefits to taking Selenium and Vitamin E. If you have any further questions please get in touch with our team via [email protected]. The Ben’s Natural Health Team.

  11. mervyn mc kay

    is this just another way to extract money or is a proven ffact

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