Off-labeled Uses Sildenafil is also occasionally used off-label for the treatment of secondary Raynaud phenomenon, female sexual arousal disorder, and as an adjunct in the treatment of altitude-induced hypoxemia. Penis pumps tend to be a lower-cost ED treatment. A mix of ED treatments works best for some people. Viagra is always taken as needed, usually about an hour before sex. The information contained herein is not a substitute for and should never be relied upon for professional medical advice. If the man is in a relationship, he needs the support and understanding of his partner.Viagra (sildenafil) is a brand-name prescription drug that’s used to treat erectile dysfunction (ED). Learn about side effects, warnings, dosage, and more. The highest recommended Viagra dose for treating erectile dysfunction (ED) is mg per day, according to the drug’s manufacturer. Doses of mg or mg would be .  · The Food and Drug Administration (FDA) has approved Cialis and Viagra to treat erectile dysfunction (ED) in males. ED is a condition in which you can’t get or keep an erection.