Vigora 100 mg is a prescription medication used to treat erectile dysfunction (ED). It's the same active ingredient as Viagra, but it's available at a fraction of the cost. In addition to treating ED, Vigora can also be used to treat pulmonary arterial hypertension (PAH). Vigora 100 mg is a medication used to treat erectile dysfunction. It works by relaxing the blood vessels in the penis, allowing more blood to enter. This results in an erection. Vigora 100 mg is available in tablet form and should be taken with water. It can be taken with or without food.