AdBrowse & discover thousands of brands. Read customer reviews & find best sellers. Find deals and low prices on erection gel at As with sildenafil, a high-fat meal or alcohol keep the body from absorbing it as quickly. It works for up to 36 hours. There is a problem with information submitted for this request. Do not stop taking sildenafil without talking to your doctor. Sildenafil Viagra is used to treat erectile dysfunction impotence; inability to get or keep an erection in men. Shake the liquid well for 10 seconds before each use to mix the medication evenly.AdGet a Prescription for ED treatment, discreetly deliverED to your : Finasteride · Shipping Policy · Tadalafil · Sildenafil. What is Viagra? Viagra is a brand-name prescription drug that’s approved to treat erectile dysfunction (ED). With ED, you’re unable to have or maintain an erection. Viagra is . Sildenafil is used to treat men who have erectile dysfunction (also called sexual impotence). Sildenafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) .You’ll soon start receiving the latest Mayo Clinic health information you requested in your inbox. This medicine works best when you take it on an empty stomach an hour before sex. Slowly pull back the plunger until the required dose. This medicine comes with a patient information leaflet. This medicine is available only with your doctor’s prescription. Sexual activity may be a strain on your heart, especially if you have heart disease.