They have the same benefits and risks as their brand-name counterparts. We considered cost, medications available, and whether generic versions were offered to help reduce costs. You’ll also need to fill out a medical questionnaire with answers about your medical history, current medications, and lifestyle habits. Contact your medical provider if you experience any side effects during treatment. While each PDE5 inhibitor differs slightly, they’re very similar in treating erectile dysfunction. Generic vs. It may be difficult to remain firm despite wanting to have sex.Viagra (sildenafil) as low as. $ View other PDE5 Inhibitors. Sildenafil (Viagra, Revatio) is a moderately priced drug used to treat erection problems in men. It is also used to treat pulmonary arterial hypertension, a serious heart and lung condition. This drug is more popular than comparable drugs. It is available in generic and brand test1.rug: online. Generic Viagra (sildenafil) is an alternative to the branded Viagra drug that can be used for treating erectile dysfunction (ED). It’s now sold by many manufacturers, including online. Drug Images What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that you take Viagra. It’s a prescription drug that’s used in adult males* with ED. With ED, you.