Yes, 100 milligrams of sildenafil is the same active ingredient found in Viagra. Cenforce 100mg is a medication used to treat erectile dysfunction, and it works by increasing blood flow to the penis. Viagra is a brand name for sildenafil, which is produced by the pharmaceutical company Pfizer. So, if a medication contains 100 milligrams of sildenafil, it is essentially the generic equivalent of Viagra, as long as it is produced by a reputable pharmaceutical manufacturer.