Dosing The dose of this medicine will be different for different patients. These medicines all work well for ED. Surgery to repair arteries can reverse ED caused by blockages that stop blood flow to the penis. Different brands may not work the same way. Oral medicines for ED usually work well and cause few side effects.Erectile Dysfunction (ED) Treatment Erectile Dysfunction (ED) Definition & Facts Symptoms & Causes Diagnosis Treatment Prevention Clinical Trials Treatment for . Since , Viagra (sildenafil) has been used for treating erectile dysfunction (ED). It’s available by prescription for males ages 18 years and older. Side . Sildenafil and tadalafil are alike because they both can treat ED and PAH. However, tadalafil has a few distinctions from sildenafil. Tadalafil is the generic name for .