Vilitra 10 mg (vardenafil) is the standard starting strength for many adults with erectile dysfunction, but it is best to use it after checking with a doctor or pharmacist. DailyMed +1 A few important precautions: Take it only as prescribed, usually about 60 minutes before sexual activity. Do not take more than once in 24 hours. Never combine it with nitrate medicines or Vilitra 10 . Check with a clinician first if you have heart disease, low blood pressure, or take medicines for heart rhythm problems.