Some hair loss medications can cause erectile dysfunction in some men, especially finasteride and dutasteride.
The popularity of male hair loss treatments has brought reports associating this type of medication with erectile dysfunction.
Although this risk is low, it is mainly related to finasteride, which reduces dihydrotestosterone (DHT) levels, a hormone involved in hair loss progression.
Most men use this treatment without experiencing sexual side effects. Still, it is important to know the possible risks before starting to use the medication.
Below, learn which medications for hair loss can affect sexual function, how they work in the body, and when to seek medical evaluation.
Does hair loss medication cause erectile dysfunction?
Some hair loss medications can cause erectile dysfunction, although this side effect is uncommon.
According to a review article, the medications most associated with changes in sexual function are finasteride and dutasteride. They reduce dihydrotestosterone levels, a hormone derived from testosterone that participates in hair loss development and also plays roles related to male sexual health.
Despite this association, most men do not experience erectile dysfunction during treatment. Still, experts recommend that patients be informed about this possible adverse effect before starting use, especially those with a history of erectile dysfunction, advanced age, or other risk factors for changes in sexual function.
Relationship between finasteride and libido
Finasteride can influence libido in some men because it reduces dihydrotestosterone levels.
Possible side effects
According to a study that evaluated the relationship between finasteride and sexual health, sexual side effects are uncommon.
Erectile dysfunction, changes in ejaculation, and decreased libido were observed in less than 2% of users. In one of the studies analyzed, the incidence of these effects dropped to 0.3% after five years of treatment.
The most accepted explanation is that finasteride reduces DHT production, a hormone involved both in hair loss progression and in mechanisms related to sexual desire.
However, the exact role of DHT in male sexual function is still not fully understood, and more studies are needed to understand this relationship.
Post-finasteride syndrome
Another condition associated with the medication is the so-called post-finasteride syndrome, characterized by persistence of sexual, physical, and neuropsychiatric symptoms after stopping treatment.
Among the reported symptoms are erectile dysfunction, reduced libido, changes in ejaculation, decreased sexual pleasure, fatigue, difficulty concentrating, memory problems, and insomnia.
Despite existing reports, the syndrome is still a matter of debate in the scientific community. Many studies have methodological limitations, and experts emphasize the need for more robust research to clarify its prevalence, causes, and mechanisms.
Can dutasteride affect sexual function?
Dutasteride can affect sexual function in some men. This reduction has been associated with effects such as decreased libido, erectile dysfunction, and changes in ejaculation.
Possible side effects
A study that evaluated men between 18 and 50 years old compared the use of dutasteride 0.5 mg with placebo for 24 weeks, followed by another 24 weeks without treatment.
During dutasteride use, there was a higher frequency of decreased libido, erectile dysfunction, and changes in ejaculation compared to the placebo group. However, these effects were mostly mild or moderate.
After stopping the medication, sexual function returned to levels observed before treatment, indicating that the effects tend to be temporary and reversible.
Current evidence suggests that dutasteride may be associated with changes in sexual function in some users, but these changes tend to disappear after stopping treatment.
Differences compared to finasteride
A comparative study between dutasteride and finasteride analyzed three clinical trials involving 576 men with hair loss.
The authors concluded that dutasteride was more effective at stimulating hair growth, as it reduces dihydrotestosterone levels more intensely.
Despite this, the research found no significant difference between the two medications regarding the risk of sexual side effects, such as changes in erectile function, decreased libido, and ejaculatory disorders.
Most common hair loss treatments
Finasteride and dutasteride are the most commonly used medications for androgenetic alopecia treatment. Although they work similarly, they have some differences.
- Finasteride: reduces dihydrotestosterone production. The most commonly used dose is 1 mg orally, once daily, preferably at the same time each day. Initial results usually appear after about three months of continuous use.
- Dutasteride: the medication more intensely blocks the conversion of testosterone to DHT, which may promote hair growth. The usual dose is 0.5 mg orally, once daily, and results also usually appear after approximately 3 months of treatment.
Consult also content about complementary strategies for male sexual health
When to see a urologist?
Seek a urologist if, after starting hair loss treatment, symptoms such as difficulty obtaining or maintaining an erection, reduced libido, or changes in ejaculation appear and persist for a few weeks.
Medical evaluation is important to identify whether these symptoms are related to the medication or other conditions, such as diabetes, cardiovascular disease, hormonal changes, anxiety, depression, or use of other medications.
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