In short
Low desire and erectile dysfunction are different problems, and treating one as the other is the most common mistake here.
- Reduced libido affects an estimated 5 to 10 per cent of men, rising with age.
- Most men who complain of erectile dysfunction do not complain of low desire. When both are present, the order they appeared in matters.
- The causes are mostly treatable: medication, depression, low testosterone, alcohol, opioids, systemic illness, and the relationship itself.
Condition Overview
Why does the distinction from erectile dysfunction matter?
Because they have different causes and different treatments. A man who wants sex but cannot get an erection has a mechanical or vascular problem. A man who no longer wants sex has something else going on.
The order matters too. Men with erectile dysfunction sometimes lose desire as a consequence of the erectile problem, and the chronology in the history is what tells the two apart.
What causes low desire in men?
| Medication | Most commonly SSRIs. Also antiandrogens, 5 alpha reductase inhibitors and opioid painkillers |
| Depression | A leading cause, and often the one the man has not connected to it |
| Low testosterone | The best known hormonal cause, and genuinely treatable when confirmed |
| Other hormones | Raised prolactin, low oestradiol, and both an underactive and an overactive thyroid |
| Alcohol and recreational drugs | Common and frequently understated |
| Fatigue and systemic illness | Any serious illness reduces desire |
| The relationship | One of the more common causes and one of the least often acknowledged |
Which hormones actually get measured?
Four: total testosterone, prolactin, thyroid stimulating hormone and oestradiol. All four have been associated with low libido in men, and testing only testosterone misses the others.
If testosterone is low, it is repeated, with luteinising hormone and prolactin, before any treatment decision. A single low reading is not a diagnosis.
What about opioids?
Sexual dysfunction is common in men using opioids long term, and those men usually have low testosterone as a consequence. Recognising this changes the treatment: it is a medication problem, not a primary hormonal one.
Is fear part of it?
Sometimes, and it is worth naming. Fear of humiliation after a previous failure, or another sexual problem such as premature ejaculation, can reduce desire in its own right.
That is a treatable pattern, and it does not respond to hormones.
When to See a Doctor
- Interest in sex has dropped over months and you are not sure why
- You started an antidepressant, an opioid or a prostate medication and desire fell afterwards
- Energy, motivation and mood have dropped alongside desire
- You have been given testosterone without your levels being confirmed on a second sample
- Alcohol has increased over the same period
- Milky discharge from the breasts, which needs prolactin checked promptly
- Headache with changes in your visual fields, which can indicate a pituitary problem
- Thoughts of self harm or loss of interest in everything, not just sex, which need assessment now
How Dr. Felix Assesses This
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1
Desire or erections, and which came first
A detailed sexual history including the chronology. Most men presenting with erectile dysfunction do not report low desire, so when both are present the sequence identifies which is primary.
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2
Medication, alcohol and mood
SSRIs, antiandrogens, 5 alpha reductase inhibitors and opioids are asked about specifically. Depression is screened for, because it is a leading cause and is often not volunteered.
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3
The four hormones
Total testosterone, prolactin, thyroid stimulating hormone and oestradiol. A low testosterone is confirmed on a repeat sample with LH and prolactin before anything is prescribed.
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4
The relationship, asked about directly
Interpersonal conflict is one of the more common causes of male sexual dysfunction and one of the least acknowledged. Where it is the issue, couples counselling is often the treatment that works.
Treatment Options
Men’s Sexual Health Consultation
The three categories Erectile dysfunction Vascular, neurological, local penile, hormonal, drug induced or psychological causes Low desire Testosterone deficiency, stress,…
View Treatment
Libido Optimization Program
Why is this page sceptical? Because the market sells hormones for a problem that is usually not hormonal, and because…
View Treatment
Sexual Wellness Program
Who is this for? People with problems affecting more than one aspect of sexual function, couples where both have a…
View Treatment
Why Early Treatment Can Matter
What responds well?
- Confirmed low testosterone. Testosterone replacement improves libido reliably, more reliably than it improves erections
- Raised prolactin. Treatable once found
- Thyroid disease. Both directions cause it, and both are correctable
- Medication effects. Often solved by changing the drug rather than adding another
- Depression. Treated, desire usually follows
The complication with antidepressants
SSRIs are the most common medication cause of low libido, and they are also a treatment for the depression that causes it. That tension has to be handled deliberately rather than ignored.
There are specific strategies for SSRI associated sexual side effects. What does not work is quietly stopping the antidepressant.
Why testosterone is not the default answer
Because in most men with low desire, testosterone is normal, and giving it does not help when it is. Testosterone improves libido in men who are deficient, and the greatest improvement is in those with more severe deficiency, below 231 ng/dL.
Prescribing it on a single borderline result, without checking prolactin and thyroid, is the most common error in this area.
The one that gets least attention
The relationship. Interpersonal conflict is a leading cause, rarely raised, and it is not going to appear on any panel.
Couples counselling by someone skilled in this area is frequently the effective treatment, and saying so is more useful than adjusting a dose.
Why Early Treatment Can Matter
What responds well?
- Confirmed low testosterone. Testosterone replacement improves libido reliably, more reliably than it improves erections
- Raised prolactin. Treatable once found
- Thyroid disease. Both directions cause it, and both are correctable
- Medication effects. Often solved by changing the drug rather than adding another
- Depression. Treated, desire usually follows
The complication with antidepressants
SSRIs are the most common medication cause of low libido, and they are also a treatment for the depression that causes it. That tension has to be handled deliberately rather than ignored.
There are specific strategies for SSRI associated sexual side effects. What does not work is quietly stopping the antidepressant.
Why testosterone is not the default answer
Because in most men with low desire, testosterone is normal, and giving it does not help when it is. Testosterone improves libido in men who are deficient, and the greatest improvement is in those with more severe deficiency, below 231 ng/dL.
Prescribing it on a single borderline result, without checking prolactin and thyroid, is the most common error in this area.
The one that gets least attention
The relationship. Interpersonal conflict is a leading cause, rarely raised, and it is not going to appear on any panel.
Couples counselling by someone skilled in this area is frequently the effective treatment, and saying so is more useful than adjusting a dose.
Most causes are treatable
Medication effects, depression, low testosterone, raised prolactin, thyroid disease, alcohol and relationship factors all have specific treatments.
The common error
Testosterone prescribed on a single borderline result, without prolactin and thyroid checked, while the real cause goes unaddressed.
Four hormones, one history
Testosterone, prolactin, TSH and oestradiol, alongside a chronology that separates low desire from erectile dysfunction.
Cost & Consultation Investment
The consultation and the hormone panel are quoted before anything is ordered. The panel covers testosterone, prolactin, thyroid function and oestradiol rather than a broad screen. Where testosterone treatment turns out to be indicated, it is confirmed on a repeat sample first, and the ongoing monitoring and its cost are explained before you start rather than afterwards.
Frequently Asked Questions
No, and treating them as the same is the usual mistake. Most men with erectile dysfunction do not report low desire. When both are present, which came first identifies which is the primary problem.
Reduced libido is estimated to affect 5 to 10 per cent of men, and it increases with age. It frequently accompanies other sexual problems rather than appearing alone.
If your testosterone is genuinely low, yes, it improves libido reliably. If it is normal, no. That is why it is confirmed on a repeat sample, with prolactin and LH, before anything is prescribed.
SSRIs are the most common medication cause. There are specific strategies for managing this, and they are worth discussing rather than stopping the antidepressant on your own.
Very. Sexual dysfunction is common with long term opioid use, and those men usually have low testosterone as a consequence of the opioid rather than as a separate problem.
Testosterone, prolactin, thyroid stimulating hormone and oestradiol. All four have been associated with low libido in men, and testing testosterone alone misses the others.
Then the cause is likely to be mood, alcohol, fatigue, medication or the relationship, and those are addressed directly. Interpersonal conflict in particular is a common cause and one that will never show on a blood test.
Evidence
Where this information comes from
Every figure on this page is taken from the sources below. All of them are free to read, so you can check them yourself.
This page is general medical information and does not replace a personal consultation. Trial results are averages across large groups, not a prediction for any one person.