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.‎What are the possible side · ‎What should I discuss with · ‎How should I take. Pictures of Ativan (Lorazepam), drug imprint information, side effects for the patient. may also be used for other purposes not listed in this medication guide. The risk of serious side effects (such as slow/shallow breathing, severe drowsiness/dizziness) may be increased if this medication is taken with other products that may also cause drowsiness or breathing problems.