Sildenafil - How long does it take to work after taking a 20 mg pill?

10 minutes

You should find a response to Sildenafil within 30 - 60 minutes after taking the pill. Taking Sildenafil after a heavy meal may slow the response slightly although I find food generally doesn't have a great effect. Most people notice a slightly flushed feeling, possibly slight nasal stuffiness and slight desensitisation of the head of the penis. Solid erection should then accompany sexual arousal.