Purpose: We determined the incidence of pain with injection of a new f
ormulation of prostaglandin E1. Materials and Methods: A total of 63 s
ubjects with erectile dysfunction underwent treatment with the new for
mulation of prostaglandin E1. Evidence of pain associated with injecti
on was obtained by questionnaire and through questioning. Results: A t
otal of 451 injections was given to 63 subjects in the office, with 16
episodes (3.5%) of pain in 10 (15.9%). Then, 680 injections were perf
ormed by 38 subjects at home, with 15 episodes (2.2%) of pain in 8 (21
%). Pain was not dose related. Conclusions: The new formulation of pro
staglandin E1 is less likely to be associated with pain compared with
alcohol based formulations.