» Ondansetron Injection is a sterile solution of Ondansetron Hydrochloride in Water for Injection or of Ondansetron in Water for Injection prepared with the aid of Hydrochloric Acid. It may contain suitable buffers and/or tonicity adjusting agents. It contains an amount of Ondansetron Hydrochloride equivalent to not less than 95.0 percent and not more than 105.0 percent of the labeled amount of ondansetron (C₁₈H₁₉N₃O).