In the present study, the investigators evaluated whether nefopam 20 mg reduce the catheter-related bladder discomfort in patients undergoing foley catheter insertion

Inclusion Criteria:

1. Patients scheduled to insert the catheter a new foley catheter more than 14 Fr in the operation site,
2. Adults 20 to 75years of age
3. American Society of Anesthesiologists Physical Classification 1,2 patients
4. Patients who pre-agreed to the study
5. Male patient

Exclusion Criteria:

1. Neurogenic bladder
2. Patients diagnosed with irritable bladder
3. study drug sensitive or contraindicated
4. Patients with central nervous system or neurological disorder (epilepsy, patients receiving MAO inhibitor)
5. Patients with urethral and prostate disorders
6. Patients with previous history of myocardial infarction
7. Patients with closed angle glaucoma