Injections sometimes can result in a painful, prolonged erection (priapism).

If you have a history of priapism (a painful and prolonged erection not associated with sexual stimulation).

Priapism, a prolonged erection unaccompanied by sexual desire; this rare condition is potentially dangerous and requires immediate medical attention.

Other side effects are possible, including dangerous prolonged erection, known as priapism.

Priapism is a prolonged erection that is usually painful not a result of sexual stimulation.

After ingesting the chemical, men can suffer prolonged, painful erections.

The drug does not alter libido and does not create prolonged erections.

Painful and prolonged erection (priapism - occurs in 10 - 40% of men with the disease)

Rarely, males may have a painful or prolonged erection lasting 6 or more hours.