Vigore 100 mg is a prescription medicine used to treat erectile dysfunction in adult men. It contains sildenafil, which improves blood flow to the penis during sexual stimulation and may help achieve and maintain a firm erection. It usually starts working within 30 to 60 minutes. Vigore 100 mg does not increase sexual desire and should be taken only as prescribed. Do not use it with nitrate medicines or riociguat because this may cause a dangerous drop in blood pressure.