When desire drops, testosterone is the first thing most men think of and often the first thing a clinic offers to treat. It is a genuine cause. It is also, in a large share of cases, not the one that is actually operating. Medication effects, sleep, mood, alcohol and vascular health explain more low libido than low testosterone does, and treating a normal testosterone level with testosterone will not fix any of them.
First, two different problems
These get collapsed into one complaint and they are not the same thing.
Libido is desire, the wanting. Erectile function is mechanics, the ability to get and keep an erection. A man can have strong desire and unreliable erections, or reliable erections and no interest at all. They have different causes and different workups, and describing which one you actually mean is the most useful sentence you can say at a consult.
The causes worth ruling out before hormones
Medications. This is the most commonly missed cause, by a wide margin. SSRI antidepressants are well known for reducing libido and delaying orgasm. Finasteride, used for hair loss and prostate symptoms, affects sexual function in some men. Opioids suppress testosterone directly and substantially. Some blood-pressure medications, particularly older beta-blockers, contribute. So do certain antipsychotics. If your libido changed within a few months of starting something new, start there.
Sleep, and specifically sleep apnea. Testosterone is produced largely during sleep, and fragmented sleep lowers it. Untreated obstructive sleep apnea both suppresses testosterone and causes the fatigue that flattens desire independently. Snoring plus daytime exhaustion plus low libido is a pattern worth investigating properly.
Depression and chronic stress. Loss of interest is a core feature of depression, and libido is often the first interest to go. Cortisol under sustained stress also suppresses the signalling that drives testosterone production.
Alcohol. Regular heavy drinking lowers testosterone, disrupts sleep and impairs erectile function. It is one of the highest-yield things to change, and among the least often raised.
Vascular health. This one matters beyond the bedroom. Erections depend on healthy blood vessel lining, and the vessels involved are small. Erectile difficulty can be an early marker of cardiovascular disease, sometimes appearing years before other symptoms. New erectile dysfunction in a man with high blood pressure, high cholesterol, diabetes or a smoking history is a reason to assess cardiovascular risk properly, not just to hand over a prescription.
Metabolic health. Type 2 diabetes and obesity affect nerve function, blood vessels and hormone levels at once.
Other endocrine causes. Elevated prolactin, which can indicate a pituitary issue, and thyroid disease in either direction both reduce libido and are simple to test for.
Relationship and psychological factors. Real, common, and not a diagnosis of exclusion to reach for only after everything else. Context matters: desire that is absent with a partner but present otherwise points somewhere different from desire that is globally gone.
What a proper workup looks like
- A full medication and supplement review, including anything started in the last year
- Sleep assessment, with a low threshold for testing for apnea
- Mood screening
- Alcohol intake, asked and answered honestly
- Total and free testosterone, drawn early morning and fasting, and repeated to confirm before anything is concluded
- Prolactin, thyroid, LH and FSH
- Metabolic and cardiovascular markers: A1c, lipids, blood pressure
- An honest conversation about context and relationship
When testosterone is the answer, and when it is not
If your levels are genuinely and repeatedly low, and symptoms fit, treatment often helps desire meaningfully. Signs of low testosterone, and when to test covers how to establish that properly, because a single afternoon blood draw does not.
If your testosterone is normal, testosterone therapy is unlikely to restore libido, and it is not a harmless experiment: it suppresses sperm production and commits you to monitoring. A clinic willing to prescribe it without confirming low levels twice is not doing you a favour.
How we approach it
A first consult here is an hour, which is roughly what this list requires. We work through medications, sleep, mood, alcohol, metabolic and cardiovascular risk and hormones together, because the answer is frequently two or three of them at once rather than a single deficiency.
If hormones do turn out to be part of it, hormone therapy for men is available as injections, gels and EvexiPEL-certified pellets, and TRT injections vs. pellets explains that choice.
Consults are available in person at our Deerfield Beach clinic and by telehealth anywhere in Florida.
Medically reviewed by Krishna Borges, MSN, APRN, FNP-C. This article is for general education and is not a substitute for individual medical advice.