Ativan is a brand name for the prescription medication Lorazepam, which is a benzodiazepine drug. It is primarily prescribed for the short-term management of severe anxiety, certain types of seizures, and insomnia related to stress. Lorazepam works by increasing the activity of gamma-aminobutyric acid (GABA), a neurotransmitter in the brain that helps to calm nerve activity. 
 
Key Information
 
Typical Uses:
Relief of anxiety symptoms or anxiety-associated depression.
Short-term treatment of insomnia caused by anxiety.
Sedation before surgical or dental procedures.
Control of acute seizures (status epilepticus).
 
Common Side Effects: Drowsiness, dizziness, fatigue, unsteadiness (ataxia), and muscle weakness.
 
Safety Warnings:
High Risk of Dependence: Lorazepam has a significant potential for dependence and addiction if used for extended periods.
Withdrawal: Abruptly stopping this medication can lead to severe withdrawal symptoms, including seizures, tremors, and intense anxiety.
Interactions: Combining Lorazepam with alcohol or opioids is dangerous and can result in severe respiratory depression or coma.
Pregnancy/Nursing: It is generally not recommended during pregnancy or breastfeeding due to potential risks to the infant. 
Usage
Lorazepam is typically taken as directed by a healthcare professional. For conditions like insomnia, a single dose is often prescribed at bedtime. The strength of the medication prescribed, such as 2mg, is determined by a physician based on the patient's specific needs and response to treatment. 
For detailed clinical information, you can refer to the FDA-approved label via RxList or consult the Mayo Clinic guide on Lorazepam.