Tadalafil usually starts to work in about 30 to 60 minutes, but in some people it can take up to 2 hours to feel the full effect.

Typical onset time

• For most men taking tadalafil as needed (10–20 mg), noticeable effect begins around 30–60 minutes after taking a tablet.

• Peak effect is often around 2 hours after the dose, and a few people may not feel much benefit until closer to that time.

How long the effect lasts

• Once it has started working, tadalafil can help you achieve erections for up to about 36 hours after a dose, as long as you are sexually stimulated.

• With low-dose daily tadalafil (2.5–5 mg), it builds up over several days and is intended to provide more continuous readiness rather than a single “on/off” window.

Factors that can change timing

• Individual factors like age, other medications, and underlying health conditions can make it work a bit faster or slower.

• A very heavy meal may delay onset somewhat, and tadalafil still requires sexual arousal to work; it will not cause an erection on its own.

When to talk to a doctor

• If tadalafil has not worked after several attempts (on different days and at the right timing), a doctor or prescriber should review dose, timing, and possible causes such as other health issues or interacting medicines.

• Seek urgent medical help if you get chest pain, severe dizziness, vision changes, or an erection lasting more than 4 hours.