Filagra tablets are a prescription drug. Filagra tablets contain Sildenafil Citrate as an active ingredient. Filagra tablets are used to treat male impotence. These tablets are taken only when needed. Taken 30 minutes to 1 hour before any sexual activity. A person can take it 4 hours before sexual activity. Taking Filagra more than once can be extremely harmful. Filagra tablets should be taken according to the doctor's advice.