PDE5 inhibitorPrescription only
Tadalafil
Tablet
Quick Summary
Tadalafil increases blood flow to the penis when sexually aroused.
Erectile dysfunction
Enlarged prostate
Medical Uses
Erectile dysfunction: As needed or daily, as prescribed.
Enlarged prostate: Daily low dose.
How it's taken
Take as prescribed, not more than once a day.
Your doctor decides the right dose for you and how long to take it.
Your doctor decides the right dose for you. Follow their instructions and the label.
Common Side Effects
Headache
Common.
Flushing
Common.
Blocked nose
Sometimes.
Interactions
Nitrates such as GTN
Dangerous drop in blood pressure.
Alpha blockers
Low blood pressure.
Critical Warnings
Never with nitrates
Black Box Warning: Can be fatal.
Erection lasting over 4 hours
Black Box Warning: Emergency.
Heart disease
Check with your doctor.
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- Tadalafil: drug information(opens in a new tab) · MedlinePlus, US National Library of Medicine
- Tadalafil(opens in a new tab) · NHS