Your primary care doctor should always know what medications you’re taking, including ED pills prescribed by another provider. Side effects Side effects of oral ED medicines are often mild. If we combine this information with your protected health information, we will treat all of that information as protected health information and will only use or disclose that information as set forth in our notice of privacy practices. Cialis tadalafil : This ED medication works with the same principle as Viagra, but lasts up to 36 hours. If you are a Mayo Clinic patient, this could include protected health information. · Sildenafil under the name Viagra is used to treat erectile dysfunction (impotence) in men. Another brand of sildenafil is Revatio, which is used to treat . · Viagra Descriptions Sildenafil is used to treat men who have erectile dysfunction (also called sexual impotence). Sildenafil belongs to a group of medicines . · To use the oral liquid: Shake the bottle well for at least 10 seconds before each use. Remove the cap by pushing it down and twisting it counter-clockwise. Push .