Avanafil is a trial medication produced by Vivus Inc that is currently be studied for erectile dysfunction. Avanafil is what is known as a PDE5 (phosphodiesterase type 5) inhibitor. There is a protein in the body that prevents blood vessels from expanding. Avanafil in essence prevents or blocks this protein so blood vessels can expand. Thus allowing blood to enter the penis and become erect during times of sexual excitement. Its premises is similar to that of vardenafil, sildenafil and tadalafil which are currently on the market as the trademarked names Levitra®, Viagra® and Cialis® respectively. Because of Avanafil's nature in how it works, some other potential uses for Avanafil (but not necessarily being studied as such, nor being prescribed as such) are urinary tract problems, types of hypertension, stroke prevention, improved female sexual function, blood clots in the circulatory system, Alzheimers disease and some others.