Dutasteride is a tablet that you take once a day to ease symptoms of an enlarged prostate, like difficulty urinating. It helps to reduce the size of your prostate, so it puts less pressure on your bladder and urethra. This should ease problems you have passing urine, like weak flow, difficulty starting, or frequent urination.
How does Dutasteride work?
Dutasteride is a type of medicine known as a 5-alpha reductase inhibitor. This means it reduces the effects of an enzyme called 5-alpha reductase, which is responsible for converting the hormone testosterone into dihydrotestosterone (DHT). DHT is involved in the development and growth of the prostate, so less testosterone being converted into DHT should reduce the size of your prostate over time. Reducing the size of your prostate means it puts less pressure on your bladder and urethra, which should provide relief from urinary symptoms associated with BPH.[1]
What doses does Dutasteride come in?
Dutasteride only comes in one dose, a 0.5 mg capsule. If this dose of Dutasteride isn’t right for you, speak to your healthcare provider about other BPH options. They may be able to recommend something that suits you better.
This page was written by The Treated Content Team.
This page was medically reviewed by Dr Alexandra Cristina Cowell on April 03, 2025. Next review due on April 03, 2028.
How we source info.
When we present you with stats, data, opinion or a consensus, we’ll tell you where this came from. And we’ll only present data as clinically reliable if it’s come from a reputable source, such as a state or government-funded health body, a peer-reviewed medical journal, or a recognised analytics or data body. Read more in our editorial policy.
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How to take Dutasteride
You just need to take your dutasteride capsule once per day. You can take Dutasteride with or without food, so you can fit it into your schedule whenever suits you best. Try and get into the habit of taking it at the same time every day, like first thing in the morning or just before going to bed, so you’re less likely to miss a dose.
How long does it take for Dutasteride to work?
BPH is a long-term treatment for Dutasteride, and you’ll have to take it for a while before you see the results. Studies show that Dutasteride reached around 65% concentration after one month of daily treatment, and 90% after three months.[1] It usually takes around three and six months before it stays at effective levels consistently, and before you see results.[1] But once you reach this point, as long as you keep taking dutasteride every day, it should help keep your symptoms in check indefinitely.
What should I do if I make a mistake taking Dutasteride?
You should only use dutasteride exactly as your healthcare provider has instructed you to. While there haven’t been any recorded safety concerns with dutasteride overdoses in clinical trials, if you take too much medicine and feel unwell, contact your physician.
If you forget to take your dose of dutasteride, you can take the missed dose as soon as you remember. But if it’s almost time for your next capsule, skip the one you forgot and carry on as normal from the next dose.
This page was written by The Treated Content Team.
This page was medically reviewed by Dr Alexandra Cristina Cowell on April 03, 2025. Next review due on April 03, 2028.
How we source info.
When we present you with stats, data, opinion or a consensus, we’ll tell you where this came from. And we’ll only present data as clinically reliable if it’s come from a reputable source, such as a state or government-funded health body, a peer-reviewed medical journal, or a recognised analytics or data body. Read more in our editorial policy.
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Dutasteride isn’t suitable for everyone, and there are some things that you need to be aware of when using it.
Here’s all the official info on it. If anything is unclear, let our clinician know, and they can talk with you about it.
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Dutasteride: FAQ
Have something specific you want to know? Search our info below, or ask our experts a question if you can’t find what you’re looking for.
Are there any Dutasteride side effects?
Answer:
Like any treatment you might use, Dutasteride comes with some risk of side effects. The most common side effects of dutasteride reported in clinical trials were:
Erectile dysfunction
Lowered sex drive
Difficulty ejaculating
Breast swelling or tenderness
If you notice any signs of a skin rash, or swelling in your eyelids, face, lips, arms, or legs, stop taking dutasteride right away and seek medical attention. These could be signs of a serious allergic reaction.
Do I need a prescription for Dutasteride?
Answer:
Yes, you’ll need a prescription if you want to use dutasteride. It’s so your doctor can make sure it’s safe for you to use, and won’t interact with any other drugs you may be using or conditions you might have. If dutasteride isn’t right for you, speak to your healthcare provider – they may be able to help you find an alternative to dutasteride that’s right for you.
How effective is Dutasteride?
Answer:
Dutasteride has proven to be an effective treatment for reducing prostate size and relieving symptoms associated with BPH. A review of evidence from large clinical studies found that dutasteride can reduce prostate volume by up to 26% after four years on dutasteride. While that might seem like a long time, dutasteride was also found to improve urinary symptoms after six months.[2] So while it may take a while to kick in, after it reaches steady levels in your system, it’ll continue to reduce the size of your prostate and relieve symptoms in the long-term.
Are there any Dutasteride alternatives?
Answer:
There are a couple of different types of medicine you can use to help treat BPH. If you’re interested in a different alpha-5 reductase inhibitor like dutasteride, finasteride might be a good alternative. It’s available as a generic treatment, or under the brand name Proscar. While evidence suggests that dutasteride can reduce the size of the prostate and improve urinary flow rate more effectively than finasteride,[1] finasteride could be a good alternative if you’ve struggled with side effects on dutasteride.
There’s also a branded version of dutasteride available, called Avodart. It contains the same active ingredient, and works in the same way as dutasteride, so it should be just as effective.
There’s another type of medicine for BPH, called alpha 1 blockers. These relax the muscles around your prostate and bladder, which should ease the urinary symptoms of BPH. Because they work in a slightly different way, they could be a good option if dutasteride hasn’t been effective for you.
Treated trusted source:
Li, Y. et al. (2022).The efficacy and safety of dutasteride and finasteride in patients with benign prostatic hyperplasia: a systematic review and meta-analysis. Translational Andrology And Urology. 11(3). pp. 313-324.
Thomson, A. (2005).Dutasteride: an evidence-based review of its clinical impact in the treatment of benign prostatic hyperplasia. Core Evidence. 1(2). pp. 143-156.
Last updated on Apr 02, 2025.
How we reviewed this page:
Our experts continually monitor new findings in health and medicine, and we update our articles when new info becomes available.
Apr 02, 2025
Published by: The Treated Content Team.Medically reviewed by: Dr Alexandra Cristina Cowell, Writer & Clinical Content Reviewer
How we source info.
When we present you with stats, data, opinion or a consensus, we’ll tell you where this came from. And we’ll only present data as clinically reliable if it’s come from a reputable source, such as a state or government-funded health body, a peer-reviewed medical journal, or a recognised analytics or data body. Read more in our editorial policy.
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Dr Alexandra Cristina Cowell
Writer & Clinical Content Reviewer
Cristina writes content for Treated, and reviews content produced by our other writers to make sure it’s clinically accurate.
When we present you with stats, data, opinion or a consensus, we’ll tell you where this came from. And we’ll only present data as clinically reliable if it’s come from a reputable source, such as a state or government-funded health body, a peer-reviewed medical journal, or a recognised analytics or data body. Read more in our editorial policy.
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