IRCT20170603034303N3 IRCT 2019-08-28 Hamedan University of Medical Sciences The effect of 30 mg oral dextromethorphan and placebo on postoperative analgesia after laparoscopic cholecystectomy The effect of 30 mg oral dextromethorphan and placebo on postoperative analgesia after laparoscopic cholecystectomy at the Hamedan Besat hospital 2019-08-23 anticipated 114 Complete https://irct.ir/trial/41701 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Parallel, Purpose: Diagnostic, Randomization description: We write two letters A and on two other sheets of letter B. We mix the papers together and put them in the drawer of the table.With each of the qualified patients, one of the papers is taken out randomly and, According to the text, the patient is given one of two groups: A (Intervention) and B Control). Then, for four subsequent patients, the paper is returned to the bag again, and this process is repeated until the end of the sample volume, Blinding description: In both groups A and B, medications after spinal anesthesia Medication or placebo will be prescribed.In order to prevent the medication being detectable for patients and investigators, they are prepared with same size and shape and on the adhesives A and B by the anesthetist. Since drugs are prescribed by an anesthetist, the clinician will not be aware of the type of prescribed medication that will measure and record the outcome of the study. 1-2 cholecystitis. Intervention 1: Intervention group: 30 mg or 10 cc of dextromethorphan syrup 2 hours before induction of anesthesia used. Intervention 2: Control group: 10 cc of a neutral syrup 2 hours before induction of anesthesia used orally. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is Because the study is not finished yet.