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You know what they do for you. Here’s what they do to you.

Onset of Action
Viagra: about 60 minutes
Levitra: 30-45 minutes
Cialis: 45-75 minutes

Eating Beforehand
Viagra: 3 hours
Levitra: 3 hours
Cialis: anytime

Duration
Viagra: 4 hours
Vardenafil: 5 hours
Cialis: up to 36 hours

Nasal Congestion
Viagra: yes
Vardenafil: yes
Cialis: yes

Facial Flushing
Viagra: yes
Vardenafil: yes
Cialis: yes

Stomach Upset
Viagra: yes
Vardenafil: yes
Cialis: yes

Headache
Viagra: yes
Vardenafil: yes
Cialis: yes

Hazy Vision
Viagra: yes
Vardenafil: no
Cialis: no

Back Pain
Viagra: no
Vardenafil: no
Cialis: yes

General Achy Feeling
Viagra: no
Vardenafil: no
Cialis: yes

Heart Risk for Men Taking Nitrates
Viagra: yes
Vardenafil: yes
Cialis: yes

End