Tadalafil as a Longevity Medicine
Bryan Johnson takes low-dose tadalafil (Cialis) daily for blood flow and longevity, not for sex. Here is what he does and what the evidence genuinely shows: a real but observational signal, and a prescription decision that belongs with a doctor, not a supplement to grab.
Treat this as medicine, not a supplement Tadalafil is prescription-only; using it for longevity is off-label and a decision to make with a doctor, not on your own
This is the single most important point: it is real medicine with real interactions and risks.
Read the numbers as associational The mortality, heart, stroke and dementia reductions come from one observational study; they show association, not proof, and are confounded by who gets prescribed the drug
Treating an observational signal as established fact is how people get misled about longevity drugs.
Understand why it might help As a PDE5 inhibitor it widens blood vessels and improves circulation, the proposed basis for cardiovascular and brain benefits
The mechanism is plausible, which is what makes the association worth studying further.
His personal protocol, for reference He reports 2.5mg daily for about two years; this is what he does, not a prescription for you
Documenting his actual regimen is the point; copying it without medical guidance is not advised.
Rule out the dangerous combinations first Never combine with nitrates (heart/chest-pain medication), it can cause a dangerous drop in blood pressure; caution with alpha-blockers and other BP drugs, and with heart, eye or hearing conditions
The nitrate interaction can be life-threatening; this must be cleared before anyone considers it.
Decide and follow up clinically Any decision should be made and monitored by a physician, including watching blood pressure and side effects
Off-label longevity use is unproven, so medical oversight is the responsible path.
PDE5 inhibitors cause vasodilation (wider blood vessels, better flow), which is the mechanism behind both erections and the proposed cardiovascular and brain benefits.
View sources
Bryan Johnson on tadalafil as longevity medicine (X / @bryan_johnson)
PDE5 inhibitors: cognitive and longevity evidence reviewed (Alzheimer's Drug Discovery Foundation, Cognitive Vitality)
Jehle et al.: Benefits of Tadalafil and Sildenafil on Mortality, Cardiovascular Disease, and Dementia (Am J Med, 2024, observational)
Not medical advice. This page is for education only and is not a substitute for professional medical care. Consult a qualified clinician before changing your health routine.
Independent curation. YourProtocol is an independent platform. This protocol is based on the publicly available work of Bryan Johnson and is not created, reviewed, endorsed by, or affiliated with Bryan Johnson or Blueprint / Don't Die.
Is this for you
- People researching off-label longevity medicine
- Anyone who saw the tadalafil longevity claims
- Those who want the evidence and the caveats together
- People who will involve a doctor
Cautions
- This is a prescription medication, not a supplement, and this page is informational only, not medical advice or a recommendation to start. Off-label use for longevity is unproven
- The benefit numbers come from observational data (association, not causation) and are confounded: men prescribed tadalafil differ systematically from those who are not. No randomized trial has shown it extends life or prevents dementia in healthy people
- Never combine tadalafil with nitrates (such as nitroglycerin for chest pain): the combination can cause a dangerous, potentially fatal drop in blood pressure. Use caution with alpha-blockers and other blood-pressure medicines
- Seek urgent medical care for sudden vision loss, sudden hearing loss, or an erection lasting over 4 hours (priapism); discuss heart conditions, recent heart attack or stroke, and low blood pressure with a doctor first
- Evidence in women is essentially absent for longevity uses; do not assume the same benefits apply
- Nothing is sold here; tadalafil is described, not offered. Any decision belongs with a qualified physician