Testosterone is not meaningfully raised by Cialis or tadalafil. These drugs treat erectile dysfunction by improving blood flow, not by boosting hormones. Some small studies have hinted at minor effects in specific groups, but tadalafil is not a testosterone treatment and should not be used as one. This article explains the relationship.
It belongs in our erectile dysfunction and men's sexual health section.
How tadalafil actually works
Tadalafil is a PDE-5 inhibitor: it relaxes blood vessels so the penis fills with blood during arousal. Its mechanism is vascular, not hormonal. It does not stimulate the testes to produce more testosterone.
What does the evidence say?
A few small studies have explored minor changes in hormone markers in particular populations, but the findings are limited and inconsistent. There is no solid basis to consider tadalafil a way to raise testosterone in general.
| Claim | Reality |
|---|---|
| Tadalafil raises testosterone | not meaningfully |
| Treats ED via blood flow | yes |
| Replaces testosterone therapy | no |
Why people confuse the two
Both low testosterone and ED affect sexual function, so men sometimes assume an ED drug must also address hormones. In fact they are separate: low testosterone is diagnosed by blood tests and treated specifically, while tadalafil targets erections.
What if testosterone is low?
If a blood test confirms low testosterone with symptoms, a doctor may treat it directly — and sometimes combine that with an ED medicine. But you should not use tadalafil hoping to fix a hormone problem. For supplements that are sometimes claimed to help, see best vitamins and supplements for ED.
The bottom line
Cialis/tadalafil does not raise testosterone in any useful way; it treats erections through blood flow. Low testosterone needs its own diagnosis and treatment. For who can assess this, see what an ED specialist does.
Supplements: Best vitamins and supplements. Specialist: ED specialist. Duration: Does sildenafil increase duration?
Signs of genuinely low testosterone
If you suspect a hormone problem, look for the typical signs of low testosterone: reduced libido, persistent fatigue, low mood, loss of muscle or increased body fat. These warrant a blood test — ideally taken in the morning, when levels are highest, and often repeated to confirm. Only a confirmed deficiency, alongside symptoms, justifies treatment. Chasing "testosterone-boosting" from an ED pill is the wrong route and can delay a proper diagnosis.
How low testosterone is actually treated
When a deficiency is confirmed, doctors treat it directly — usually with testosterone replacement in a suitable form, with monitoring. In men who have both low testosterone and ED, a clinician may combine hormone treatment with a PDE-5 inhibitor, since they address different parts of the problem. The key point is that tadalafil is not part of the hormone treatment; it handles the erection side while testosterone therapy, if needed, handles the hormone side.
Frequently asked questions
- Does Cialis raise testosterone?
- Not meaningfully — it works on blood flow, not hormones.
- Can it replace testosterone therapy?
- No; low testosterone needs its own diagnosis and specific treatment.
- Why the confusion?
- Both low testosterone and ED affect sexual function, but they are separate issues.