Vigra is a medication primarily used to treat erectile dysfunction in men. It works by increasing blood flow to the penis, helping to achieve and maintain an erection when sexually aroused. The active ingredient in Vigra is sildenafil, which belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors. Vigra is typically taken as needed, about 30 minutes to an hour before sexual activity. It is important to note that Vigra does not cause an erection without sexual stimulation and should not be used by individuals taking nitrates for heart conditions, as this can lead to serious side effects.