1 doctor weighed in:

How often is normal dose of viagra (sildenafil) for adults?

1 doctor weighed in
Dr. David Sneid
Internal Medicine - Endocrinology

In brief: Works for 6 hours

Viagra (sildenafil) usually works for at least 6 hours and takes up to one hour to become effective after you take it.
50-100 mg is the normal dose. It depends upon how often you need it as to how often you have to take it. Cialis lasts longer - up to 36 hours and can be taken at lower dose on a daily basis. Check w/your doctor, .

In brief: Works for 6 hours

Viagra (sildenafil) usually works for at least 6 hours and takes up to one hour to become effective after you take it.
50-100 mg is the normal dose. It depends upon how often you need it as to how often you have to take it. Cialis lasts longer - up to 36 hours and can be taken at lower dose on a daily basis. Check w/your doctor, .
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