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# Lorazepam (Benzodiazepine)
## Overview
Lorazepam is a benzodiazepine with sedative, hypnotic, anxiolytic, 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 neuronal inhibition.
## Primary Indications
* Anxiety disorders
* Insomnia due to anxiety
* Seizures (status epilepticus)
* Preanesthetic medication
## Adult Dosing
* **Anxiety:** 1-4 mg orally every 6-8 hours as needed.
* **Insomnia:** 2-4 mg orally at bedtime.
* **Status Epilepticus:** 4 mg slow IV injection or IM. May repeat in 10-15 minutes, not to exceed 8 mg in a 1-hour period.
* **Preanesthetic Medication:** 2-4 mg IM or IV.
Dosing for specific indications and routes (e.g., IV, IM, intranasal) may vary based on institutional protocols and patient response.
## Pediatric Dosing
Dosing in pediatric patients is not well-established and should be approached with caution.
* **Status Epilepticus:** 0.1 mg/kg/dose IV or IM, not to exceed 4 mg/dose. May be repeated after 5 minutes, not to exceed 0.2 mg/kg in 24 hours.
## Dose Adjustments
* **Hepatic Impairment:** Use with caution; dose reduction may be necessary.
* **Renal Impairment:** No specific dose adjustment is routinely recommended, but caution is advised.
## Contraindications
* Known hypersensitivity to lorazepam or other benzodiazepines.
* Acute narrow-angle glaucoma.
* Severe respiratory insufficiency.
* Severe liver dysfunction.
* Sleep apnea.
## Adverse Effects
Common: Drowsiness, dizziness, weakness, unsteadiness, fatigue, ataxia, confusion.
Serious: Respiratory depression, paradoxical reactions (agitation, hallucinations), amnesia, dependence, withdrawal symptoms.
## Key Drug Interactions
* **CNS Depressants (e.g., opioids, alcohol, barbiturates, other sedatives):** Increased risk of profound sedation, respiratory depression, coma, and death. **Concomitant use is strongly discouraged if alternatives exist; if necessary, use the lowest effective doses for the shortest duration and monitor closely.**
* **Theophylline/Aminophylline:** May decrease the sedative effects of lorazepam.
* **Valproic acid:** May increase lorazepam plasma concentrations.
## Monitoring
* Level of consciousness, respiratory rate, and blood pressure, especially with IV administration.
* Signs of dependence and withdrawal with prolonged use.
* Effectiveness for the intended indication.
## Clinical Pearls
* Lorazepam has a moderate half-life, making it suitable for intermittent use.
* Intravenous administration should be slow to minimize the risk of respiratory depression and hypotension.
* Abrupt discontinuation after prolonged use can lead to withdrawal symptoms. Tapering of the dose is recommended.
* Use in elderly patients should be initiated at the lowest effective dose due to increased sensitivity to CNS effects.
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**Disclaimer:** This information is intended for healthcare professionals and is not a substitute for clinical judgment. Always consult the most current prescribing information and relevant guidelines before administering any medication. Patient-specific factors must be considered.
