Many men have some level of erectile dysfunction. This may strain relationships and make a man frustrated. Penile injections of PRP are often effective at restoring normal erectile function. A single injection session may be sufficient, but often 2-3 sessions a few months apart are done for best results. These injections should not be confused with aprostadil (brand names Caverject and Edex), which is injected immediately before sex and repeated each time one has sex. A side effect of PRP penile injections is an increase in penile size. Typical the penis will elongate about an inch and the width will increase 20-30%. Viagra, Cialis, Levitra and similar drugs may be used in conjunction with PRP injections, but are often not needed. Men with less severe erectile dysfunction may respond better to treatment, but even those with no ability to get erect are often helped.