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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, resulting in increased inhibitory neurotransmission.
## Primary Indications
* Anxiety disorders
* Insomnia (short-term treatment)
* Status epilepticus (seizure control)
* Preoperative sedation and anxiolysis
* Management of alcohol withdrawal symptoms
## Adult Dosing
* **Anxiety:** 0.5 mg to 2 mg orally every 6 to 8 hours. Maximum daily dose generally not to exceed 10 mg.
* **Insomnia:** 2 mg to 4 mg orally at bedtime.
* **Status Epilepticus:** 2 mg to 4 mg IV or IM initially. May repeat every 5 to 10 minutes up to a maximum of 8 mg in a 12-hour period. Alternatively, 0.1 mg/kg IM or IV, not to exceed 4 mg per dose.
* **Preoperative:** 2 mg to 4 mg IM given 2 hours before surgery.
* **Alcohol Withdrawal:** 1 mg to 4 mg orally or IM every 4 to 6 hours as needed. Dosing is highly individualized based on symptoms.
## Pediatric Dosing
Dosing in pediatric patients is not well-established and should be individualized based on age, weight, and clinical response.
* **Status Epilepticus:** 0.05 mg/kg IV or IM (maximum 2 mg per dose), may repeat every 5-10 minutes to a maximum total dose of 0.1 mg/kg or 4 mg, whichever is less.
## Dose Adjustments
* **Hepatic Impairment:** Use with caution. Dose reduction may be necessary.
* **Renal Impairment:** No specific dose adjustment, but use with caution due to potential for accumulation.
* **Elderly:** Initiate with lower doses (e.g., 0.5 mg twice daily) and titrate cautiously due to increased sensitivity to CNS depressant effects.
## Contraindications
* Hypersensitivity to lorazepam or other benzodiazepines.
* Acute narrow-angle glaucoma.
* Severe respiratory insufficiency.
* Severe hepatic insufficiency.
* Myasthenia gravis.
* Sleep apnea.
## Adverse Effects
Common adverse effects include drowsiness, dizziness, weakness, unsteadiness, and ataxia. Less common but serious effects include respiratory depression, paradoxical reactions (agitation, hallucinations), anterograde amnesia, and dependence with prolonged use.
## Key Drug Interactions
* **CNS Depressants (opioids, alcohol, other sedatives, antihistamines):** Additive CNS depression, potentially leading to profound sedation, respiratory depression, coma, and death.
* **Theophyllines/Aminophylline:** May reduce the sedative effects of lorazepam.
* **Valproic acid:** May increase lorazepam levels and prolong its half-life.
## Monitoring
* Monitor for sedation, respiratory rate, and oxygen saturation, especially with IV administration or in combination with other CNS depressants.
* Assess for signs of dependence and withdrawal symptoms with discontinuation.
* Evaluate effectiveness for the intended indication (e.g., anxiety reduction, seizure control).
## Clinical Pearls
* Lorazepam is available in oral, sublingual, intramuscular, and intravenous formulations. Intramuscular absorption can be slower and more variable than oral.
* Intravenous lorazepam should be administered slowly to avoid respiratory depression and hypotension.
* Avoid abrupt discontinuation due to risk of withdrawal symptoms. Taper slowly over weeks or months.
* Lorazepam is not generally recommended for long-term treatment of anxiety or insomnia due to risk of tolerance, dependence, and withdrawal.
* Due to its short half-life, lorazepam is less likely to cause significant daytime sedation compared to longer-acting benzodiazepines.
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*This information is intended for healthcare professionals and does not replace a thorough review of the most current prescribing information and clinical guidelines. Always verify current drug information before making clinical decisions.*
