Does Finasteride Lower Testosterone Levels or Increase Them?
Many believe testosterone levels are decreased by taking finasteride, but does finasteride lower testosterone levels really? Discover the truth about how finasteride affects testosterone in your body during hair loss treatment.
What you'll learn:
- How finasteride impacts testosterone levels
- The mechanism behind hormonal changes
- Expected testosterone increases with treatment
- Important considerations for hormone monitoring
There's a common misconception that finasteride lowers testosterone levels, but does finasteride lower testosterone really?
The reality: This is actually a myth. Finasteride does the opposite—it increases testosterone levels while decreasing DHT.
💡 Here's why: Finasteride works by decreasing levels of DHT, so less binds to the hair. However, since less testosterone is being converted to DHT, there is a higher level of testosterone. The key to protecting the hair is decreasing the levels of DHT.
What you need to know:
- Finasteride blocks DHT conversion, not testosterone production
- Testosterone levels actually increase by 10-20%
- DHT levels decrease by about 70%
- This mechanism is what protects your hair
Why understanding this matters: Many people avoid finasteride due to misconceptions about testosterone, missing out on effective hair loss treatment.
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📋 Table of Contents
Jump to what you need:
Does finasteride lower testosterone levels?
Finasteride, AKA Propecia, does not lower testosterone but acts by decreasing the levels of circulating dihydrotestosterone (DHT), which decreases by about 70%. Free testosterone in circulation is actually increased, usually by about 10-20%. It does this by inhibiting the conversion of testosterone to dihydrotestosterone (DHT).
DHT is a culprit in hair loss, acting by binding to the hair follicle and thinning the hair. Eventually the hair falls out.
Key Point: Finasteride doesn't reduce your body's testosterone production—it simply prevents testosterone from being converted into DHT. This means more testosterone remains in your bloodstream while DHT levels drop significantly.
How does finasteride raise testosterone?
Finasteride's mechanism of action is blocking the action of an enzyme called 5-alpha-reductase. This enzyme blocks the conversion of testosterone to dihydrotestosterone (DHT). So while the levels of DHT drop dramatically, there is more testosterone that is left unconverted which raises the blood levels of testosterone.
Finasteride Mechanism of Action
Finasteride's mechanism of action is blocking the action of an enzyme called 5-alpha-reductase. This enzyme blocks the conversion of testosterone to dihydrotestosterone (DHT). So while the levels of DHT drop dramatically, there is more testosterone that is left unconverted which raises the blood levels of testosterone.
These hormonal changes apply whether you use finasteride as a tablet or a scalp treatment. Our guide on topical finasteride vs oral explains how the different delivery methods change systemic exposure and side-effect risk.
There is another drug called Dutasteride, which is very similar to finasteride, but actually results in more decreased levels of DHT. Dutasteride inhibits 3 types of 5-alpha-reductase, which is why it results in a 99% decrease in levels of DHT rather than around 70% like you would expect with finasteride.
Understanding the Process:
- Step 1: Your body produces testosterone naturally
- Step 2: The 5-alpha-reductase enzyme converts some testosterone to DHT
- Step 3: Finasteride blocks this enzyme
- Step 4: Less testosterone gets converted, so more stays as testosterone
- Result: Lower DHT, higher testosterone
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How much does finasteride increase testosterone?
When on finasteride, testosterone levels generally increase by about 10-20%. While it does vary, the vast majority of patients see an increase in that range. Usually this keeps people in the normal range for free testosterone, but it is always good to check and track the testosterone levels over time.
What to Expect:
- Typical increase: 10-20% rise in testosterone levels
- DHT decrease: Approximately 70% reduction
- Initial spike: Sometimes testosterone rises more than 20% initially, then stabilizes
- Timeline: Hormone adjustments typically occur within the first few months
- Monitoring: Regular blood tests recommended to track levels
Important considerations:
- Most people remain within normal testosterone ranges
- Individual responses can vary
- Baseline testing before starting treatment is recommended
- Follow-up testing helps ensure levels stay balanced
Finasteride effect on testosterone: Key takeaways
Finasteride is still the gold standard when it comes to preserving and thickening hair, but there are finasteride effects on testosterone. While it drops DHT by about 70%, which is essential for protecting and thickening hair, it also raises testosterone by about 10-20%. Sometimes there is an initial spike higher than 20% that drops back down while the body adjusts. It is always a good idea to track your hormone blood levels over time.
Summary of hormonal changes:
- DHT levels: Decrease by approximately 70%
- Testosterone levels: Increase by approximately 10-20%
- Hair protection: Achieved through DHT reduction
- Monitoring: Regular blood work recommended
Bottom Line: Finasteride doesn't lower testosterone—it raises it. The drug works by preventing testosterone conversion to DHT, which means you get more circulating testosterone while DHT (the hormone that causes hair loss) drops significantly. This is exactly the hormonal profile you want for hair preservation and regrowth.
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FAQs
Can I take finasteride and TRT together?
Yes, it is fine to be taking finasteride and testosterone together. While both are obviously raising testosterone, that doesn't necessarily mean your testosterone levels will be too high. It is important to track your testosterone and DHT levels before you start, and periodically once you start treatment.
If you're curious what kind of changes to expect physically, check out these TRT before and after photos and see real transformation results over time.
Combining finasteride with TRT:
- Both treatments can be used safely together
- Regular monitoring is essential
- Baseline hormone levels should be established first
- Follow-up testing helps prevent levels from going too high
- Work with a healthcare provider experienced in both treatments
What else should I be aware of?
There are finasteride hormone effects and it is possible to see slightly increased levels of estrogen after starting finasteride. The increased testosterone levels will result in some of the testosterone being aromatized to estradiol. Other side effects are erectile issues, decreased sex drive, and ejaculatory issues.
While not common, these side effects are known to occur for some people. Topical finasteride side effects are decreased very significantly, but all side effects will disappear after discontinuing the medication.
Potential side effects to monitor:
- Hormonal: Slight estrogen increases due to testosterone aromatization
- Sexual: Erectile dysfunction, decreased libido, ejaculatory issues (rare)
- Reversibility: All side effects typically resolve after stopping treatment
- Alternative: Topical formulations may reduce systemic side effects
Important notes:
- Side effects affect a small percentage of users
- Most men tolerate finasteride well
- Topical options available for those concerned about systemic effects
- All effects are reversible upon discontinuation
What happens if you take too much finasteride?
While nothing life threatening occurs with taking too much finasteride, there is evidence that taking too high a dose can put you at increased risk of having some sexual side effects. At higher doses, there is a higher incidence of side effects such as erectile dysfunction, decreased libido, etc.
Dosage considerations:
- Standard dose: 1mg daily for hair loss
- Higher doses: Associated with increased side effect risk
- More isn't better: Higher doses don't significantly improve results
- Safety profile: No life-threatening effects from overdose
- Stick to prescribed amounts: Recommended dosing is optimized for safety and efficacy
For a topical formulation of finasteride, check out Solve Rx.
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