Sildenafil acts as the active ingredient in Vigora 100mg tablets. Vigora is supposed to be taken one hour before sex, after which it lasts for 5-6 hours. With Vigora 100 you must take it only once in 24 hours. Vigora 100 is the best drug to solve the problem of ED. The Vigora 100 Mg should be kept away from small children and pets.