Will 6 mg of Ativan kill a 15 year old?

This medication is used to treat anxiety, the benzodiazepines in this tablet will act on the brain and nerves (central nervous system) to produce a calming effect. The common side effects are drowsiness, dizziness, loss of coordination, headache, nausea, blurred vision, change in sexual interest/ability, constipation, heartburn, or change in appetite. Talk to the doctor / Psychiatrist who has been treating her, as there are serious effects such as mental/mood changes (such as hallucinations, depression, thoughts of suicide), talking, vision changes, unusual weakness, trouble walking etc. Your query seems to be really a concern, best to alert responsible elders in the family and help your friend by preventing her from taking any drastic steps.