[Ondansetron, alfentanil and nitrous oxide in the prevention of pain on injection of propofol].

Introduction: Propofol is a widely used intravenous anesthetic with a number of advantages over intravenous anesthetics used so far.The leading side effect is pain on injection.

Objective: Aim of the study was to determine the impact of ondansetron, nitrous oxide and alfentanil on reducing pain during propofol application.