Vardenafil (Oral Route) Proper Use - Mayo Clinic
https://www.mayoclinic.org/drugs-supplements/vardenafil-oral-route/proper-use/drg-20067107
WebAdults—10 milligrams (mg) as a single dose, no more than once per day, approximately 1 hour before sexual activity. Children—Use is not recommended. For oral dosage form (tablets): Adults 65 years and older—5 milligrams (mg) as a single dose, no more than once per day, approximately 1 hour before sexual activity.
DA: 48 PA: 68 MOZ Rank: 83