A prospective study was carried out on the efficacy and safety of clean intermittent catheterization (CIC). The series included 41 adults (15 females, 26 males), the mean follow-up time being 40 months. Most patients were suffering from neurogenic bladder disorders. All of them used a self-lubricating hydrophilic catheter. Thirty-one patients (76%) continued to undergo CIC, but 9 discontinued. Thirty patients (73%) experienced bacteriuria during the procedure. Three males had epididymitis. Contrary to many earlier reports, urinary tract infections seem to increase after CIC, raising the question of whether prophylactic antibiotic therapy should be used more often in these cases. There were no urethral complications suggesting that the self-lubricating hydrophilic catheters may be less traumatic than those used previously.