Clinical studies have proven that vacuum erection devices will give instantly harder erections, cause temporary flaccid enlargement, and can increase permanent penis augmentation. According to the American Urological Association, these devices may also be useful in cases where such PDE5 drugs as Viagra have failed to work! Doctors view the penis pump as a safe, effectual,l and cost-effective treatment for erectile dysfunction and state that the prolonged use of these devices will enhance the size of the penis permanently.