It acts after sexual stimulation by relaxing the blood vessels and allowing more blood flow into the penis. Children: Viagra Sildenafil is not intended for use by children or adolescents under 18 years of age. Kidney problems: If you have poor kidney function you may need lower doses of Viagra Sildenafil. Do not take Viagra if you: Are taking any medicine that contains nitrates in any form oral, sublingual [under the tongue], skin-patch, or by spray or inhalation. It is important to take Viagra exactly as prescribed by your doctor.Low libido (reduced sex drive) can strike men at any age, but it becomes more common as a man gets older. It may be caused by: psychological factors, such as child abuse, . CIALIS VIAGRA Toll Free Phone: Toll Free Fax: 24 hours / 7 days a week See what customers have to say about our products and services. . Description This medication is typically used for erectile problems in men. Its effects can be felt within 1 hour. Find a Pharmacy Print this card Instructions Certain heart medication .