Vilitra is a drug used to treat sexual problems in men, whose main ingredient is sildenafil citrate. This drug works by increasing the flow of blood to the penis. You should not take this medicine if you have any type of allergy. This drug is taken on an empty stomach. Do not chew or crush these pills. This tablet can be swallowed with a glass of water. It takes 30-60 minutes for this drug to take effect. This medicine works for 4-5 hours. You can enjoy sex more with your sexual partner with this medicine.