All of the oral ED medications now on the market belong to the same family of drugs — PDE5 inhibitors — as Viagra. These include vardenafil hydrochloride in both Levitra and Staxyn, tadalafil in Cialis, and avanafil in Stendra. Although these chemical compounds are very similar in structure, each differs subtly from the others.
Some men with ED symptoms find that all of these drugs produce the desired results for them but may prefer a specific drug because it has fewer if any, side effects or goes to work faster than the others.
Others may find that one of the PDE5 inhibitors doesn’t work for them at all, while the rest do.
If you need an oral ED drug to get and keep an erection, you owe it to yourself to give them all a try to see which is best for you. In the end, it becomes a matter of personal preference. While most of these medications have a duration of action lasting from four to six hours, Cialis for use as needed is the exception. Its effects can last up to 36 hours, setting it apart from the rest of the PDE5 inhibitors now available.