There are various criteria that affect the efficacy of the procedural sedation strategies required for performing different processes in emergency departments. Selecting the most effective and the safest sedative with or without analgesic effect for every individual patients and intervention is one of the main parts of the each emergency department practices. Based on previous studies, various sedative agents have been proposed, which have different benefits and adverse effects including propofol, ketamine, etomidate etc. Different side effects of administrating each drug, alone or in combination with each other, have been proposed such as vomiting, respiratory depression, hypoxia, hypotension and cardiac arrest. In this study we aimed to briefly review the properties of applied sedatives in different studies and also mention few related clinical trials with proper blinding, which were conducted to evaluate the efficacy of the sedative in procedural sedation