Vidalista 40 mg is a prescription drug that is used to treat erectile dysfunction in men. It works by increasing blood flow to the penile area. This helps men maintain and achieve an erection. It belongs to the group of medications known as phosphodiesterase type 5 inhibitors. It works quite well, but you have to take it 30 to 60 minutes before doing anything sexual. Use of this drug should be avoided if you have had a heart attack, stroke, or heart failure in the last six months. Do not take it more than once per day. Seek medical attention if the erection persists after engaging in sexual activity for more than 36 hours.