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# Lorazepam
## Overview
Lorazepam is a short-acting benzodiazepine with anxiolytic, sedative, hypnotic, amnestic, anticonvulsant, and muscle relaxant properties. It acts by enhancing the effect of the neurotransmitter gamma-aminobutyric acid (GABA) at the GABA-A receptor.
## Primary Indications
* Management of anxiety disorders
* Short-term treatment of insomnia
* Status epilepticus (IV/IM)
* Premedication for medical or surgical procedures
## Adult Dosing
* **Anxiety:** 0.5 mg to 2 mg orally every 6 to 8 hours. Maximum daily dose typically 10 mg.
* **Insomnia:** 2 mg to 4 mg orally at bedtime.
* **Status Epilepticus:** 4 mg IV or IM. May repeat 4 mg after 5 to 10 minutes if seizures persist. Maximum initial dose 8 mg.
* **Premedication:** 2 mg to 4 mg IM or IV given 15 to 60 minutes before surgery.
Dosing for specific indications may vary based on institutional protocol and patient response.
## Pediatric Dosing
* **Anxiety:** Safety and efficacy in children under 12 years of age have not been established.
* **Status Epilepticus:** 0.05 mg/kg IV, not to exceed 4 mg per dose. May repeat 0.05 mg/kg every 5 to 10 minutes if seizures persist. Maximum total dose 0.1 mg/kg.
* **Sedation:** Dosing varies widely based on indication and patient status.
## Dose Adjustments
* **Hepatic Impairment:** Use with caution; dosage reduction may be necessary.
* **Renal Impairment:** No specific dose adjustment recommended, but monitor closely.
* **Elderly:** Start with lower doses (e.g., 0.5 mg BID) and titrate slowly due to increased sensitivity to CNS depressant effects.
## Contraindications
* Hypersensitivity to lorazepam or other benzodiazepines.
* Acute narrow-angle glaucoma.
* Use in comatose patients or patients with severe respiratory depression.
## Adverse Effects
* **Common:** Drowsiness, dizziness, sedation, weakness, unsteadiness, confusion.
* **Serious:** Respiratory depression, paradoxical reactions (agitation, excitement), dependence and withdrawal symptoms with prolonged use.
## Key Drug Interactions
* **CNS Depressants (opioids, alcohol, other sedatives/hypnotics, antihistamines):** Additive CNS depression. Increased risk of sedation, respiratory depression, coma, and death.
* **Valproic acid:** May increase lorazepam plasma concentrations.
* **Theophylline/Aminophylline:** May decrease lorazepam's sedative effects.
## Monitoring
* Level of consciousness, sedation, and respiratory status, especially with IV/IM administration and in elderly or debilitated patients.
* Signs of dependence and withdrawal if used long-term.
* Therapeutic response and side effects.
## Clinical Pearls
* Lorazepam is often preferred for IV/IM administration due to its relatively low risk of propylene glycol toxicity compared to other benzodiazepines.
* Intramuscular absorption can be unpredictable; IV administration is generally preferred for status epilepticus.
* Abrupt discontinuation can lead to withdrawal symptoms, including rebound anxiety, insomnia, and in severe cases, seizures. Tapering is recommended.
* Avoid alcohol and other CNS depressants.
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*This information is intended for healthcare professionals and does not replace the need to consult the most current prescribing information and relevant literature.*
