Leading causes of ED are listed below. Store mixed oral liquid in the refrigerator. If you’re worried about having an awkward talk with your doctor, reach out to one of our online physicians for guidance. Children—Use is not recommended. If you are a Mayo Clinic patient, this could include protected health information. Erectile dysfunction symptoms include persistent: Trouble getting an erection Trouble keeping an erection Reduced sexual desire Men of any age may benefit from the use of Viagra Sildenafil if they experience any of the above symptoms. In this case, just leave out the missed dose and take your next dose at the usual time.For example, a year-old might start at a dose of 50 milligrams (mg), while a year-old might have a starting dose of 25 mg. This is because, in older people, the body clears . Viagra is approved for this use in males ages 18 years and older. Viagra contains the drug sildenafil. It belongs to a class of drugs called phosphodiesterase type 5 (PDE5) . Last updated on Uses Warnings Before taking Dosage Side effects Interactions FAQ What is Viagra? Viagra relaxes muscles found in the walls of blood .