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What is the duration of the effects of viagra?
Viagra lasts about 4 to 6 hours as an active window, not a constant erection, with onset around 30 to 60 minutes.
Viagra (sildenafil) typically works for about 4 to 6 hours, though this varies between men. It does not give a continuous erection for that whole time; rather, it leaves a window during which an erection is easier to achieve with arousal. Onset is around 30 to 60 minutes. This article explains how long Viagra lasts and what affects it.
It is a topic in our erectile dysfunction section.
Onset and the active window
Viagra usually starts working within 30 to 60 minutes and reaches peak effect in the first hour or two. After that the effect gradually fades over several hours, giving a typical active window of about 4 to 6 hours. During this time, arousal can produce an erection more readily.
It is a window, not a constant erection
A common misconception is that Viagra causes an erection lasting hours. In fact it simply makes erections easier during its active period; without arousal, there is no erection. The effect comes and goes with stimulation throughout the window.
| Stage | Approximate timing |
|---|---|
| Onset | 30–60 minutes |
| Peak | first 1–2 hours |
| Total window | about 4–6 hours |
What affects the duration
Duration varies with dose, age, metabolism, kidney and liver function, and whether it was taken with food. A heavy, fatty meal delays onset and can shorten the useful window. Other medicines that affect liver enzymes can also change how long it lasts.
Viagra versus longer-acting options
If a longer window matters, Cialis (tadalafil) lasts up to 36 hours and may suit men who prefer spontaneity. Viagra's shorter, predictable window suits planned activity. A doctor can help choose based on lifestyle and how each is tolerated.
The takeaway
Viagra lasts roughly 4 to 6 hours as an active window, not a constant erection, with onset around 30 to 60 minutes. For firmness during that window, see does Viagra increase hardness, and for generic options, generic Cialis.
Hardness: erection hardness. Generics: generic Cialis. Younger men: can a 30-year-old take Viagra?
Planning around the window
Because the window is a few hours, many men take Viagra around an hour before intimacy and avoid a heavy meal beforehand. Knowing the timing helps you plan without pressure. If spontaneity matters more than a fixed window, a longer-acting option may suit you better.
Frequently asked questions
- How long do Viagra's effects last?
- Typically about 4 to 6 hours as an active window, with onset around 30 to 60 minutes.
- Does it give an erection the whole time?
- No; it makes erections easier during the window, but arousal is still needed.
- What shortens the effect?
- A heavy fatty meal, heavy alcohol and individual factors like metabolism.