The side effects however, included fainting, vomiting, dizziness and low blood pressure. For more information, you can access the full breakdown of Viagra, Viagra Connect and Kamagra. Kidney disease that needs to be treated with dialysis. Myths about Viagra There are many myths and misconceptions surrounding Viagra sildenafil , a drug commonly used to treat erectile dysfunction ED. Addyi may boost sex drive in women with low sexual desire who find the experience distressing. · Viagra; Descriptions. Sildenafil is used to treat men who have erectile dysfunction (also called sexual impotence). Sildenafil belongs to a group of medicines . Why is this medication prescribed? Sildenafil (Viagra) is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men. Sildenafil (Viagra). This medicine works best when you take it on an empty stomach an hour before sex. The body takes longer to absorb it after a high-fat meal or .