Ativan (Wyeth): 2 and 4 mg/ml in ml vials and 1-ml preloaded syringes. Each milliliter of Lorazepam is classified as a Schedule IV drug. Lorazepam is an Average sedative dose (IV)‎: ‎2 mg. Oct 10, - Ativan (lorazepam) is useful for the short-term relief of manifestations .. response, an increase in responding during the shock schedule in the. Ativan is also classified as a Schedule IV drug by the United States Drug Enforcement Administration, indicating that it has a moderate potential for abuse and for.