viagra at canadian pharmacy buy viagra 100mg online If none of these nonsurgical therapies is satisfactory to the patient and his partner, a discussion regarding the relative merits and adverse effects associated with penile implants can be introduced. Some data indicate an additional benefit in some men who have an implant but also take a PDE-5 inhibitor. Sexual stimulation and sensation is enhanced. Results of recent surveys indicate that, on average, 15% of the male population has suffered from erectile dysfunction. As a strong indicator of its age-related increase, more than 50% of men over the age of 60 have varying degrees of erectile dysfunction (ED). So it may not be surprising that it is estimated that ED affects approximately 31 million men in the United States, and as a whole, there may be as many as 300 million men around the world suffering with ED. (1) While you are being treated for ED, it is important to be patient with your progress and keep in mind that everybody is different and that a treatment that might work for one person may not work or be appropriate for you. It is also important to know that the treatment you choose may not work the first time or may not work every time.