Generic Name: Lorazepam
Common Brand Names: Ativan, Loraz, Temesta
Introduction
Lorazepam is a benzodiazepine with anxiolytic, sedative, hypnotic, anticonvulsant, and muscle-relaxant properties. It is commonly used for anxiety disorders, insomnia, and seizure management. It has a relatively intermediate duration of action compared to other benzodiazepines.
Conditions of Use (Indications)
1. Anxiety Disorders:
- Short-term management of severe anxiety.
2. Insomnia:
- Particularly when associated with anxiety.
3. Seizures and Status Epilepticus:
- First-line agent for terminating status epilepticus.
4. Preoperative Sedation:
- Used to induce sedation and reduce anxiety prior to procedures.
5. Alcohol Withdrawal:
- To prevent or manage withdrawal symptoms, including seizures.
Mechanism of Action
Lorazepam enhances the effect of gamma-aminobutyric acid (GABA), the primary inhibitory neurotransmitter in the brain. It binds to the benzodiazepine site on the GABA-A receptor, increasing chloride ion influx, hyperpolarizing neurons, and reducing excitability.
Side Effects
1. Common Side Effects:
- Sedation, dizziness, weakness, fatigue.
- Cognitive impairment, ataxia, and amnesia.
2. Serious Side Effects:
- Respiratory depression, especially when combined with other CNS depressants.
- Dependence, tolerance, and withdrawal syndrome with long-term use.
Harmful Interactions
1. CNS Depressants (e.g., alcohol, opioids):
- Increased risk of respiratory depression and sedation.
2. Antihistamines:
- Additive sedative effects.
3.CYP450 Inhibitors (e.g., fluoxetine):
- May prolong the action of lorazepam.
Contraindications
- Severe respiratory insufficiency.
- Acute narrow-angle glaucoma.
- Known hypersensitivity to benzodiazepines.
Latest References
- American Psychiatric Association (APA) Guidelines for Anxiety Disorders (2023).
- Epilepsia Journal (2023): Status Epilepticus Management.
- British Journal of Psychiatry (2023): Benzodiazepines in Clinical Practice.