The goal of this clinical trial is to compare the effect of melatonin, diazepam, and placebo on the level of anxiety in patients undergoing surgery. The main question it aims to answer is: • Is melatonin effective in reducing the anxiety of patients undergoing surgery? Participants will be asked to answer a questionnaire then they will receive either melatonin, diazepam, or placebo, and then after an hour, they will answer the same questionnaire again. Researchers will compare melatonin, diazepam, and placebo to see if melatonin is as effective in reducing the level of anxiety as diazepam in patients undergoing surgery.
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Change in the Anxiety Score Using the Visual Analogue Score for Anxiety Between Treatment Arms
Timeframe: Before administration of premedication, and after 1 hour from the administration of the premedication.
Change in Anxiety Score Based on The Amsterdam Preoperative Anxiety and Information Scale (APAIS) Between Treatment Arms
Timeframe: Before administration of premedication, and after 1 hour from the administration of the premedication.