Neurolytic or surgical lumbar sympathectomy are commonly used for the treatment of intractable pain, peripheral vascular insufficiency and hyperhydrosis. For the procedure, the patient sometimes has to suffer from complications such as major vascular perforation, subarachnoid injection, genitofemoral neuralgia, somatic neuralgia, disc perforation, ureteral stricture, inflammation, ejaculatory failure, chronic lumbago. The authors came across with a case of ejaculatory failure a week after both lumbar sympathetic block with 6 ml of 100% alcohol at L3 level under the control of fluoroscopy. Three months after the block the patient recovered without any treatment.