Low Libido in Men: Causes, Testosterone, Medications and Treatment Options in 2026
Low sex drive in men isn’t always caused by low testosterone. Learn what can affect male libido, how low T is evaluated, and what treatment options exist in 2026.
When a man’s sex drive drops, testosterone is often the first suspect.
Sometimes low testosterone is part of the explanation.
But low libido can also occur because of medications, depression, chronic stress, relationship factors, sleep problems, other hormonal conditions or changes in overall health.
And there is another common source of confusion:
Low libido and erectile dysfunction are not the same thing.
A man may strongly want sex but have difficulty developing or maintaining an erection. Another may have normal erections but very little interest in sex.
Understanding that difference is one of the most useful starting points for figuring out what has changed.
The testosterone conversation is also evolving in 2026.
In April 2026, the FDA announced that preliminary evidence suggested testosterone replacement therapy, or TRT, may be safe and effective for certain men with low libido associated with idiopathic hypogonadism—low testosterone without a known cause. The agency encouraged manufacturers of approved testosterone products to discuss pursuing a potential new indication.
That was an important regulatory development.
But it was not a new FDA approval for testosterone as a general treatment for low libido.
Read the FDA’s April 2026 announcement.
The Short Answer
Low libido in men can have many causes. Low testosterone is one of them, but low sex drive does not automatically mean low testosterone.
Current sexual-medicine recommendations recognize testosterone as an important regulator of male sexual desire and recommend evaluating testosterone in men who report reduced desire.
But diagnosing testosterone deficiency requires more than saying:
“My sex drive is low.”
Symptoms need to be considered together with appropriately obtained laboratory results.
And even when testosterone is low, libido and erectile function can behave differently.
A large randomized study published in 2024 found that testosterone therapy in middle-aged and older men with hypogonadism and low libido improved sexual desire and sexual activity, but did not significantly improve erectile function compared with placebo.
Read the TRAVERSE Sexual Function Study.
That finding captures one of the most important ideas in male sexual health:
Desire and erections are related—but they are not interchangeable.
What Is Low Libido in Men?
Libido generally refers to sexual desire or interest in sexual activity.
Sexual desire can involve:
- sexual thoughts and fantasies
- interest in initiating sex
- responsiveness to sexual situations
- motivation to engage in sexual activity
There is no universal amount of sexual desire that every man should have.
Libido differs significantly between people and can change with age, health, medications, relationships and life circumstances.
So the more useful question is often not:
“Do I want sex often enough?”
but:
“Has my desire changed significantly from what is normal for me?”
A temporary decline during illness, exhaustion or a stressful period can be very different from a persistent change that is personally troubling.
Is Low Libido the Same as Male HSDD?
Not necessarily.
Low libido is a symptom.
Male hypoactive sexual desire disorder, or MHSDD, is a clinical diagnosis. Current sexual-medicine literature describes it as persistent or recurrent deficiency or absence of sexual fantasies and desire that causes significant distress and is not better explained by another medical condition, medication, mental-health disorder or severe relationship stress.
Read the 2025 ICSM review of male sexual desire.
That distinction matters.
Someone whose libido changed after starting a medication, for example, may have a medication-related sexual effect rather than MHSDD.
Someone with low testosterone may have sexual symptoms related to hypogonadism.
And someone under extreme stress may experience a temporary reduction in desire without having a sexual disorder.
Related reading: Low Libido in Women: Causes, HSDD and Treatment Options in 2026
Low Libido vs. Erectile Dysfunction: What’s the Difference?
This is one of the most important distinctions in male sexual health.
Libido describes whether you want sexual activity.
Erectile function describes whether you can develop and maintain an erection.
A man can have:
Low libido + normal erections
He may have little interest in sex but still be physically capable of becoming erect.
Normal libido + erectile dysfunction
He wants sex but has difficulty developing or maintaining an erection.
Low libido + erectile dysfunction
Both desire and physical erectile response may have changed.
Those situations may have very different causes and may require different approaches.
Sildenafil and tadalafil, for example, are PDE5 inhibitors used for erectile dysfunction. They support a blood-flow pathway involved in erections during sexual stimulation.
They are not FDA-approved treatments for low sexual desire.
Related reading: PT-141 vs. Sildenafil vs. Tadalafil: What’s the Difference?
What Causes Low Libido in Men?
There is rarely one universal explanation.
Several factors may also occur at the same time.
1. Low Testosterone
Testosterone plays an important role in regulating male sexual desire.
The 2025 recommendations from the Fifth International Consultation on Sexual Medicine, or ICSM, identify testosterone as a significant regulator of male sexual desire and recommend measuring serum testosterone in men who present with reduced desire.
Read the ICSM recommendations.
Low libido and decreased spontaneous or morning erections are also among the sexual symptoms commonly associated with male hypogonadism.
But the important distinction remains:
Low libido can be a clue to low testosterone. It does not prove it.
Symptoms that can occur with testosterone deficiency may include:
- reduced sexual desire
- fewer spontaneous or morning erections
- erectile difficulties
- fatigue or reduced energy
- changes in mood
- reduced physical vigor
- changes in muscle mass or body composition
Many of these symptoms are nonspecific.
That is why symptoms and laboratory findings need to be interpreted together.
2. Depression, Anxiety and Stress
Sexual desire is influenced by emotional and psychological health.
Depression can reduce interest, motivation and pleasure—including sexual interest.
Chronic stress, anxiety, performance concerns, work pressure, financial stress and major life changes can also affect desire.
Sometimes this becomes circular.
A man experiences erectile difficulty once.
He worries that it will happen again.
Sex begins to feel like a test rather than something enjoyable.
Performance anxiety increases.
He starts avoiding sexual situations.
Eventually, the experience may feel like:
“My sex drive disappeared.”
But testosterone may never have been the primary problem.
3. Medications
Medication history is an important part of evaluating a change in libido.
Antidepressants
Some antidepressants—particularly SSRIs—can affect several areas of sexual function.
Current sertraline prescribing information identifies sexual effects in men including decreased libido, erectile dysfunction and ejaculation problems.
View current sertraline prescribing information.
That does not mean antidepressants should simply be stopped.
Depression itself can also reduce sexual desire, and suddenly changing psychiatric medication can have important consequences.
A useful question is often:
Did my libido change before the medication—or after starting it or changing the dose?
Medication changes should be discussed with the healthcare professional managing that treatment.
Finasteride
Finasteride is used for conditions including male-pattern hair loss and benign prostatic hyperplasia.
Its prescribing information includes sexual adverse reactions such as decreased libido, erectile dysfunction and ejaculation disorders.
View finasteride prescribing information.
Not every man taking finasteride experiences these effects.
But if sexual function changed after beginning treatment, the timing is relevant information.
Opioids
Long-term opioid use can affect hormonal signaling and has been associated with androgen deficiency.
FDA safety information notes that opioid-associated androgen deficiency may include symptoms such as low libido and erectile dysfunction.
Read the FDA opioid safety communication.
This illustrates another important point:
A medication may affect libido directly—or indirectly by influencing other biological systems.
4. Other Hormonal Conditions
Testosterone is important, but it is not the only hormone involved in male sexual desire.
Prolactin
The 2025 ICSM recommendations identify prolactin as an important regulator of male sexual desire and recommend evaluating prolactin in men presenting with reduced desire.
Severe hyperprolactinemia can be associated with low libido.
The same recommendations note that mild elevations are much less likely to explain reduced sexual desire.
Read the ICSM hormonal recommendations.
Thyroid function
Both hypothyroidism and hyperthyroidism can be associated with sexual dysfunction.
Current ICSM recommendations suggest evaluating sexual function in men with known thyroid disorders, while noting that routine thyroid testing is not necessary for every man presenting with sexual dysfunction.
The broader lesson is:
“Hormonal” does not automatically mean “testosterone.”
5. Relationship and Sexual Context
Sexual desire does not exist independently from relationships and circumstances.
Emotional distance, unresolved conflict, changes in attraction, sexual routine, a partner's health, mismatched desire or negative sexual experiences can all influence interest in sex.
Sometimes a man may say:
“I have no sex drive.”
but still experience sexual thoughts, masturbation or desire in other contexts.
That difference can be useful when understanding whether the change is generalized or situation-specific.
6. Sleep, Energy and Overall Health
Sexual interest can change when someone is exhausted, sleeping poorly, recovering from illness or living with chronic health problems.
Obesity, type 2 diabetes and metabolic syndrome are also frequently associated with low testosterone and sexual dysfunction, although the relationships among metabolic health, testosterone, libido and erections are complex.
Recent international recommendations describe a bidirectional relationship between obesity and low testosterone: excess weight can contribute to lower testosterone, while low testosterone can coexist with metabolic changes.
That does not mean every man who is overweight has low testosterone—or that weight loss automatically restores libido.
It does mean sexual symptoms should be viewed in the context of the whole health picture.
Related reading: Do GLP-1 Medications Affect Your Sex Drive?
Does Low Testosterone Cause Low Libido?
It can.
Reduced sexual desire is one of the sexual symptoms most consistently associated with testosterone deficiency.
But testosterone does not function like a simple on/off switch.
Men with similar testosterone levels can experience very different symptoms.
Professional organizations also use somewhat different thresholds and frameworks when defining hypogonadism.
The American Urological Association uses a total testosterone level below 300 ng/dL as a reasonable cutoff supporting a diagnosis of testosterone deficiency.
Importantly, the AUA recommends that the diagnosis be made only after two total testosterone measurements on separate occasions, both obtained in the early morning, together with relevant symptoms or signs.
Read the AUA Testosterone Deficiency Guideline.
So a single low laboratory result does not automatically establish:
“This is why my libido is low.”
How Is Low Testosterone Evaluated?
A clinician evaluating possible testosterone deficiency generally considers both:
Symptoms
and
laboratory findings.
Morning testosterone measurements are used because testosterone levels vary during the day.
If an initial result is low, repeat measurement helps determine whether the level is consistently low rather than a temporary result.
Depending on the clinical picture, additional testing may help investigate why testosterone is low or whether another endocrine condition is contributing.
The goal is not simply to find a testosterone number.
It is to answer:
Does the overall clinical picture actually fit testosterone deficiency?
Can Testosterone Treatment Improve Libido?
In men who have hypogonadism and low libido, research indicates that testosterone therapy can improve sexual desire for some patients.
One of the strongest recent studies is the TRAVERSE Sexual Function Study.
The randomized trial included 1,161 middle-aged and older men with confirmed low testosterone and low libido. Participants received testosterone gel or placebo.
Over two years, testosterone therapy produced greater improvements in:
- sexual desire
- sexual activity
- hypogonadal symptoms
than placebo.
But there was an equally important finding:
Testosterone did not significantly improve erectile function compared with placebo.
Read the TRAVERSE Sexual Function Study.
That distinction is important because testosterone therapy is often discussed online as though libido, erections and sexual performance are all the same outcome.
They are not.
Does Testosterone Improve Erections?
Not necessarily.
Testosterone plays biological roles in erectile physiology, and some research has found modest improvements in erectile function among hypogonadal men.
But the effect on erections is generally less consistent than the effect on sexual desire.
The TRAVERSE Sexual Function Study, for example, found improved sexual desire and activity without a significant improvement in erectile-function scores compared with placebo.
Meanwhile, PDE5 inhibitors such as sildenafil and tadalafil directly target a pathway involved in erectile response.
So:
Low desire + low testosterone may point toward one clinical evaluation.
Normal desire + erectile difficulty may point toward another.
And some men experience both.
What Changed With Testosterone Treatment in 2026?
This is one of the most important current developments in men’s sexual health.
April 2026: FDA Opened a Path Toward a Potential Low-Libido Indication
On April 16, 2026, the FDA announced that it was encouraging sponsors of approved testosterone-replacement products to contact the agency if they were interested in pursuing a potential new indication for low libido in men with idiopathic hypogonadism.
The FDA described idiopathic hypogonadism in this context as low testosterone without a known cause.
The agency said its preliminary review of emerging evidence suggested TRT may be safe and effective for certain men in this population.
Importantly, the FDA said its preliminary assessment focused on published literature from rigorous, well-controlled clinical trials, together with discussion at a December 2025 expert panel.
The agency also emphasized that any new indication would still require substantial evidence of effectiveness and evidence that the benefits outweigh the risks.
What does that mean today?
It means the FDA sees enough emerging evidence to invite manufacturers to pursue an expanded indication.
It does not mean testosterone has automatically become FDA-approved for every man with low libido.
As of August 2026, the FDA's public testosterone information still describes approved testosterone products as replacement therapy for men with low testosterone associated with an underlying medical condition.
View current FDA testosterone information.
June 2026: FDA Requested Broader Testosterone-Label Updates
On June 18, 2026, HHS announced that FDA was requesting additional updates to testosterone-replacement product labeling after reviewing newer clinical data and existing evidence.
The requested changes included:
- removing the limitation of use stating that safety and effectiveness in men with age-related hypogonadism had not been established
- updating prostate-cancer risk information
- revising warnings related to benign prostatic hyperplasia
The announcement also noted that existing evidence—including the cardiovascular TRAVERSE trial—had changed the agency's assessment of some previous testosterone-label restrictions.
Read the June 2026 HHS/FDA announcement.
These developments reflect a meaningful evolution in the regulatory view of testosterone therapy.
But they should not be interpreted as:
“Testosterone is now an FDA-approved libido booster.”
That would go beyond what the agency has said.
Testosterone Is Not a General Libido Booster
The recent FDA developments do not mean that every man experiencing low sexual desire should receive testosterone.
The strongest evidence for improvement in libido comes from men who actually have hypogonadism together with relevant symptoms.
The 2025 ICSM recommendations specifically support testosterone therapy for improving libido in hypogonadal men.
Read the ICSM recommendations.
That is very different from giving testosterone simply because someone would like more sexual desire.
The clinical goal of testosterone replacement is to treat an appropriate testosterone-deficiency state—not to create unusually high testosterone levels or enhance sexual performance.
Testosterone Treatment Also Requires Monitoring
Testosterone is prescription therapy and has important safety considerations.
Depending on the individual patient and the product prescribed, clinical monitoring may include testosterone levels, blood pressure and blood counts.
Current testosterone labeling warns that treatment can increase hematocrit—the proportion of blood composed of red blood cells—and some testosterone products can increase blood pressure.
The AUA recommends measuring hemoglobin and hematocrit before testosterone therapy is started.
Another important issue is fertility.
Exogenous testosterone can suppress the hormonal signals required for normal sperm production.
The AUA advises against testosterone therapy in men who are currently trying to conceive.
So fertility plans should be discussed before starting treatment.
Treatment Options for Low Libido in Men
There is no single “male libido medication” that is appropriate for everyone.
Treatment depends on what is contributing to the change.
1. Address a Medication Contributor
If libido changed after starting or changing a medication, that timing may be clinically useful.
A healthcare professional may consider whether the medication could be contributing and whether another strategy is appropriate.
Do not stop or change a prescription medication solely because you suspect it is affecting sexual function.
2. Treat Confirmed Testosterone Deficiency When Appropriate
For men with relevant symptoms and consistently low testosterone, testosterone replacement therapy may be considered when medically appropriate.
Prescription testosterone is available in multiple formulations, including topical and injectable products.
The appropriate product, dose and monitoring strategy depend on the individual patient.
The objective is to treat clinically appropriate testosterone deficiency—not to maximize testosterone beyond normal physiologic levels.
3. Treat Erectile Dysfunction if Desire Is Actually Normal
Sometimes a man describes his problem as low libido because repeated erectile difficulty has made sexual activity stressful or discouraging.
If sexual desire remains intact but erectile response is the main concern, treating ED may be more relevant than treating libido.
Sildenafil and tadalafil are established PDE5 inhibitors for erectile dysfunction.
They are not substitutes for testosterone, and they are not FDA-approved treatments for low sexual desire.
Related reading: PT-141 vs. Sildenafil vs. Tadalafil: What’s the Difference?
4. Address Another Hormonal Condition When Present
When evaluation identifies another endocrine issue—such as significant hyperprolactinemia or clinically relevant thyroid disease—addressing that condition may be more relevant than simply prescribing testosterone.
This is another reason broad claims about “hormone optimization” can be misleading.
The specific abnormality matters.
5. Address Depression, Anxiety or Relationship Factors
When psychological or relationship factors are contributing, testosterone or ED medication may not address the main issue.
Depending on the situation, appropriate care may involve mental-health treatment, counseling, sex therapy or relationship-focused approaches.
Male sexual desire has biological, psychological and interpersonal components.
Ignoring one of those dimensions can lead to treating the wrong problem.
6. Consider Sleep, Metabolic Health and Lifestyle in Context
Poor sleep, chronic stress, heavy alcohol use, inactivity and broader health conditions can coexist with reduced sexual desire.
Obesity and metabolic disease can also overlap with lower testosterone in some men.
Improving overall health can be worthwhile, but no lifestyle change should be presented as a guaranteed libido treatment.
If sexual desire has changed significantly or persistently, identifying the pattern and possible contributors is more useful than chasing a generic “testosterone booster.”
What About Viagra, Cialis or PT-141 for Low Libido?
These medications are often discussed together online, but they should not be viewed as interchangeable libido treatments.
Sildenafil and tadalafil are PDE5 inhibitors used to treat erectile dysfunction.
They support erectile response during sexual stimulation but are not FDA-approved treatments for low sexual desire.
PT-141 / bremelanotide works through a different biological pathway. The FDA-approved bremelanotide product, Vyleesi®, is indicated for certain premenopausal women with HSDD—not for men.
PT-141 has been studied experimentally in men, but research use is not the same as an FDA-approved male indication.
Read the detailed comparison: PT-141 vs. Sildenafil vs. Tadalafil: What’s the Difference?
Frequently Asked Questions
What Causes Low Libido in Men?
There is no single cause that applies to every man.
Potential contributors include low testosterone, depression, stress, medication effects, relationship factors, sleep problems, other hormonal conditions and changes in overall health.
The timing and pattern of the change often provide more useful information than immediately assuming one cause.
Is Low Libido Always Caused by Low Testosterone?
No.
Low testosterone is an important potential contributor to reduced sexual desire, but many other factors can affect libido.
A testosterone measurement can be useful, but it needs to be interpreted together with symptoms and clinical history.
Can I Have Low Libido With Normal Erections?
Yes.
Sexual desire and erectile function are different components of sexual response.
A man can have little interest in sex while remaining physically capable of having an erection.
Likewise, a man can have strong desire but experience erectile dysfunction.
What Testosterone Level Is Considered Low?
There is not one completely universal cutoff used by every professional organization.
The American Urological Association uses total testosterone below 300 ng/dL as a reasonable cutoff supporting the diagnosis of testosterone deficiency.
The AUA also recommends two separate early-morning testosterone measurements rather than diagnosing testosterone deficiency from a single result.
Can Testosterone Increase Sex Drive?
In men with confirmed hypogonadism and low libido, randomized studies have found improvements in sexual desire with testosterone therapy.
That does not mean testosterone will increase libido in every man or that low desire alone establishes a need for testosterone treatment.
Does Testosterone Improve Erectile Dysfunction?
It may improve erectile function modestly in some hypogonadal men, but its effect on desire is generally more consistent.
In the TRAVERSE Sexual Function Study, testosterone improved sexual desire and activity but did not significantly improve erectile function compared with placebo.
Can Viagra or Cialis Fix Low Libido?
Not directly.
Sildenafil and tadalafil are PDE5 inhibitors used for erectile dysfunction.
They support blood flow involved in an erection during sexual stimulation but are not FDA-approved treatments for low sexual desire.
If erectile function improves, confidence or sexual satisfaction may also change—but that is different from directly treating libido.
Can Antidepressants Lower Sex Drive in Men?
Yes.
Some antidepressants, particularly SSRIs, can cause sexual side effects in some men, including decreased libido, erectile dysfunction and ejaculation difficulties.
Depression itself can also reduce sexual desire, so determining whether the condition, medication or both are contributing requires context.
Do not stop an antidepressant without discussing it with the healthcare professional managing the treatment.
Can Finasteride Affect Libido?
Finasteride prescribing information includes decreased libido and other sexual adverse reactions.
Not every man taking finasteride experiences these effects.
If a change in sexual function began after starting treatment, the timing may be useful information during an evaluation.
Can Opioids Lower Testosterone and Libido?
Long-term opioid use can affect hormonal signaling and has been associated with androgen deficiency.
FDA safety information notes that opioid-associated androgen deficiency may include low libido and erectile dysfunction.
Does Testosterone Treatment Affect Fertility?
Yes, it can.
Exogenous testosterone can suppress sperm production.
Men who are currently trying to conceive should make fertility plans clear before considering testosterone therapy.
Is Testosterone FDA-Approved for Low Libido in Men in 2026?
Not as a general low-libido treatment.
In April 2026, FDA encouraged manufacturers to pursue a potential new indication for low libido associated with idiopathic hypogonadism based on emerging evidence.
But FDA emphasized that any new indication would still require substantial evidence of effectiveness and a favorable benefit-risk assessment.
That is different from an existing blanket approval for male low libido.
What Changed With Testosterone Therapy in 2026?
Two major FDA-related developments occurred.
In April, FDA opened a pathway for manufacturers to pursue a potential low-libido indication in men with idiopathic hypogonadism.
In June, FDA requested broader testosterone-label updates related to age-associated hypogonadism, prostate-cancer information and benign prostatic hyperplasia.
These are meaningful regulatory changes, but they do not make testosterone a universal treatment for low sexual desire.
When Your Sex Drive Changes, the Pattern Matters
Low desire does not automatically mean low testosterone.
And erectile difficulty does not automatically mean low libido.
AmalfiDuo Online Care
If you have noticed a persistent change in sexual desire or sexual response, you can complete a private online health evaluation through AmalfiDuo.
A licensed clinician will review your health information to determine whether treatment may be appropriate.
A prescription is never guaranteed.
References
- FDA Takes Step Forward on Testosterone Therapy for Men. U.S. Food and Drug Administration. April 16, 2026.
- Testosterone Information. U.S. Food and Drug Administration. Updated June 23, 2026.
- HHS Announces Requested Updates to Testosterone Therapy Product Labels. U.S. Department of Health and Human Services. June 18, 2026.
- Testosterone Deficiency Guideline. American Urological Association.
- Rastrelli G, Antonio L, Carrier S, Isidori A, Maggi M. The hormonal regulation of men's sexual desire, arousal, and penile erection: recommendations from the Fifth International Consultation on Sexual Medicine (ICSM 2024). Sexual Medicine Reviews. 2025;13(4):433–455.
- Khera M, et al. Male hypogonadism: recommendations from the Fifth International Consultation on Sexual Medicine (ICSM 2024). Sexual Medicine Reviews. 2025;13(4):548–573.
- Pencina KM, Travison TG, Cunningham GR, et al. Effect of Testosterone Replacement Therapy on Sexual Function and Hypogonadal Symptoms in Men With Hypogonadism. The Journal of Clinical Endocrinology & Metabolism. 2024;109(2):569–580.
- Snyder PJ, Bhasin S, Cunningham GR, et al. Effects of Testosterone Treatment in Older Men. The New England Journal of Medicine. 2016;374:611–624.
- Sertraline Hydrochloride — U.S. Prescribing Information. DailyMed, U.S. National Library of Medicine.
- Finasteride — U.S. Prescribing Information. DailyMed, U.S. National Library of Medicine.
- FDA Drug Safety Communication: Opioid Pain Medicines and Androgen Deficiency. U.S. Food and Drug Administration.
This article is provided for general educational purposes only and is not a substitute for individualized medical advice, diagnosis or treatment. Always discuss prescription medications and changes in sexual health with a qualified healthcare professional. AmalfiDuo Journal articles are written by AmalfiDuo Editorial and are not medically reviewed — see our Editorial Policy.
Viagra®, Cialis® and Vyleesi® are trademarks of their respective owners. AmalfiDuo is not affiliated with or endorsed by the owners or manufacturers of these brands
