Erectile dysfunction (ED) affects as many as 30 million men in the United S
tates. Its risk factors are similar to those for atherosclerotic heart dise
ase. Physicians should ask male patients-particularly those with cardiovasc
ular disease-about ED and men with confirmed ED about cardiovascular risk f
actors. Oral sildenafil is an effective therapy for both organic and psycho
genic ED; it is contraindicated in patients taking organic nitrates.