<prompt> Substance responsible for erection of penis -ClomipraminePapaverineBuspironeAmitriptyline  <response>: Ans. is b i.e., Papaverine Papaverineo It is a nonspecific phosphodiesterase inhibitor.o Injection of papaverine with or without phentolamine into corpus cavemosum produces penile tumiscence to permit intercourse.o Repeated injection can cause penile fibrosis. 