Most men, understandably don’t like the concept of injections so there is a psychological hurdle to begin with. In addition 20% of men can experience an painful erection, 3-5 % penile curvature and less than 5% can experience a prolonged erection that wont go down despite the absence of sexual stimulus.
Are there side effects to penile injections?
by Dr Charles Chabert | Feb 3, 2017