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Switching from Finasteride to Dutasteride 

While Finasteride blocks the Type II 5-alpha-reductase enzyme, Dutasteride inhibits both Type I and Type II enzymes. This transition could be the key to achieving better results.
Written by: Jack Health Team
Reviewed by: Sarah Bento-De Sousa PharmD. RPh

For those experiencing limited results, switching from Finasteride to Dutasteride is a common consideration. 

While Finasteride blocks the Type II 5-alpha-reductase enzyme, Dutasteride inhibits both Type I and Type II enzymes. This transition could be the key to achieving better results.

What are Finasteride and Dutasteride?

Finasteride and Dutasteride are medications.Both work by blocking the enzyme 5-alpha-reductase, which converts testosterone into dihydrotestosterone (DHT). 

Finasteride specifically targets Type II 5-alpha-reductase, reducing DHT levels by about 70%. Dutasteride, however, blocks both Type I and Type II enzymes, resulting in a more substantial DHT reduction of around 90%.

How are Finasteride and Dutasteride Different?

Finasteride and Dutasteride differ in their potency and mechanism of action. Check out the table below to learn more about these differences. 

Aspect

Finasteride

Dutasteride

Chemical Structure

1-methyl-3-oxo-4-aza-5α-androst-1-ene-17β-carboxamide

4-aza-androst-1-en-17-one

Half-Life

4-6 hours

4-5 weeks

DHT Reduction

More significant reduction in DHT levels

Less significant reduction in DHT levels

Potency

More potent, inhibits both Type I and Type II enzymes

Effective but less potent, targets only Type II enzyme

Track Record

Newer option with promising results

Long-established with a reliable track record

How to Switch from Finasteride to Dutasteride

Switching from Finasteride to Dutasteride can be easy if done correctly. Here’s how to make the transition smoothly:

  1. Before switching, consult your doctor to see if Dutasteride is right for you.
  2. Complete your current Finasteride prescription to avoid sudden changes in DHT levels.
  3. Begin with a low dose of Dutasteride while still taking Finasteride, as advised by your doctor.
  4. Pay attention to any new side effects or symptoms as you start Dutasteride.
  5. Your doctor may increase your Dutasteride dose over time and gradually stop Finasteride.
  6. Regularly check in with your doctor to monitor your progress and adjust your treatment as necessary.

 

Many consider combining treatments for better results. If you’re adding Minoxidil, our guide on taking Finasteride and Minoxidil together offers insights into how they can work together effectively.

Why Would Someone Switch from Finasteride to Dutasteride?

Someone might switch from Finasteride to Dutasteride for several reasons. Dutasteride is more potent, offering better results by reducing DHT levels more effectively. If Finasteride isn’t providing the desired results or causes side effects, or if a doctor recommends it, Dutasteride could be a stronger alternative.

Which is Stronger: Dutasteride or Finasteride?

When deciding which medication is stronger, we look at the effectiveness and side effects. Dutasteride is considered stronger because it blocks both Type I and Type II enzymes. This leads to a greater reduction in DHT levels. However, this strength may also increase the risk of side effects. 

Clinical studies show Dutasteride is more effective than Finasteride, but always consult your doctor before switching.

For a detailed comparison of these medications, including strengths and side effects, see our Dutasteride vs. Finasteride guide. This will help you decide which option suits your needs.

Is It Safe to Use Dutasteride and Finasteride Together?

No, it’s usually not recommended to use Dutasteride and Finasteride together. The combination can increase side effects like sexual dysfunction and hormonal imbalances. 

While it might lower DHT levels more,, there’s little research to support this approach. The potential health risks make it a risky and experimental option. It’s best to consult your doctor before considering this combination.

If you’re curious about the potential benefits and risks of using both medications together, read our article on taking Finasteride and Dutasteride together. It provides a detailed analysis to help you make an informed decision.

Key Takeaways

  • Dutasteride is more potent than Finasteride, reducing DHT levels more effectively.
  • Switching from Finasteride to Dutasteride can be beneficial, but consult your doctor first.
  • Combining both medications is not recommended due to increased side effects and limited research.

Frequently Asked Questions

Can I Switch from Dutasteride to Finasteride?

Yes, you can switch from Dutasteride to Finasteride. However, there’s no solid evidence supporting this approach as effective. So, it’s better to follow a consistent treatment plan recommended by your doctor. 

What is the Superiority of Dutasteride Over Finasteride?

Dutasteride is three times more potent than Finasteride in inhibiting Type II 5-alpha-reductase. It reduces serum DHT levels by 98%, compared to Finasteride’s 71% reduction. 

Resources

  • Olsen, E., Hordinsky, M., Whiting, D., Stough, D., Hobbs, S., Ellis, M., Wilson, T., & Rittmaster, R. (2006). The importance of dual 5alpha-reductase inhibition in the treatment of male pattern hair loss: results of a randomized placebo-controlled study of dutasteride versus finasteride. Journal of the American Academy of Dermatology, 55 6, 1014-23. https://doi.org/10.1016/J.JAAD.2006.05.007.
  • Harcha, W., Martínez, J., Tsai, T., Katsuoka, K., Kawashima, M., Tsuboi, R., Barnes, A., Ferron-Brady, G., & Chetty, D. (2014). A randomized, active- and placebo-controlled study of the efficacy and safety of different doses of dutasteride versus placebo and finasteride in the treatment of male subjects with androgenetic alopecia. Journal of the American Academy of Dermatology, 70 3, 489-498.e3. https://doi.org/10.1016/j.jaad.2013.10.049.
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