SUIIlIIlaryA bladder-neck opening test using alfuzosin, a new alpha-adrenoceptor blocking agent, was carried out in 21 patients with spinal cord injury. The efficacy of alJuzo sin was assessed with 4 simple urodynamic parameters: micturition, residual urine, posterior urethral pressure and diameter. Both mean urethral pressure and diameter were significantly affected after the administration of 5 mg i.v. alJuzosin. The test was clinically positive in 18 patients: 11 out of 13 patients using intermittent cath eterisation or continuous drainage urinated and 6 out of 8 patients already tapping had reduced residual urine volumes. A decrease in posterior urethral pressure was also observed in 2 out of 3 patients who did not respond clinically to alJuzosin.AlJuzosin was well tolerated during this test. Oral alfuzosin should therefore be investigated in patients who gave a satisfactory response to such a test.