Ativan (lorazepam) belongs to a group of drugs called benzodiazepines. Lorazepam affects chemicals in the brain that may be unbalanced in people with Maintenance dose: 1 to 2 mg orally 2 to 3 times. Mar 17, - Lorazepam is the generic form of the brand-name drug Ativan, used to treat anxiety disorders and to relieve anxiety that's associated with. Less serious side effects may include: drowsiness, dizziness, tiredness; blurred vision; sleep problems (insomnia); muscle weakness, lack of balance or coordination; amnesia or forgetfulness, trouble concentrating; nausea, vomiting, constipation; appetite changes; or. skin rash.