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# Lorazepam
## Overview
Lorazepam is a short-acting benzodiazepine with anxiolytic, sedative, hypnotic, amnestic, and anticonvulsant properties.
## Primary Indications
* Anxiety disorders
* Insomnia
* Seizures (status epilepticus)
* Premedication for surgical procedures
* Sedation in intensive care settings
## Adult Dosing
* **Anxiety:** 0.5 mg to 2 mg orally every 8 hours as needed. Doses may be increased as required, but the total daily dose usually does not exceed 10 mg.
* **Insomnia:** 2 mg to 4 mg orally at bedtime.
* **Status Epilepticus:** 4 mg administered intravenously or intramuscularly. A second dose of 4 mg may be administered 5-10 minutes after the first dose if seizures persist.
* **Premedication:** 2 mg to 4 mg orally or intramuscularly 2 hours before surgery.
* **ICU Sedation:** 0.02 mg/kg to 0.04 mg/kg intravenously every 6-12 hours. Continuous infusion: 0.03 mg/kg to 0.1 mg/kg per hour. Dosing is highly individualized.
## Pediatric Dosing
* **Status Epilepticus:** 0.05 mg/kg intravenously or intramuscularly, not to exceed 4 mg per dose. May repeat in 5-10 minutes.
* **Anxiety/Sedation:** Dosing is not well established in pediatric patients and should be individualized based on response and tolerance. Extreme caution is advised due to increased sensitivity to benzodiazepines.
## Dose Adjustments
* **Hepatic Impairment:** Use with caution. Dosage reduction may be necessary.
* **Renal Impairment:** Use with caution. Dosage reduction may be necessary.
* **Elderly:** Start with lower doses (e.g., 0.5 mg orally twice daily) and titrate slowly. Elderly patients are more susceptible to adverse effects, including sedation, dizziness, and ataxia.
## Contraindications
* Known hypersensitivity to lorazepam or other benzodiazepines.
* Acute narrow-angle glaucoma.
* Severe respiratory insufficiency.
* Severe hepatic insufficiency.
* Sleep apnea.
## Adverse Effects
* **Common:** Sedation, dizziness, weakness, unsteadiness, fatigue, confusion.
* **Less Common:** Hypotension, amnesia, ataxia, blurred vision, nausea.
* **Serious:** Respiratory depression, paradoxical reactions (e.g., agitation, aggression), dependence, withdrawal symptoms.
## Key Drug Interactions
* **CNS Depressants (e.g., opioids, alcohol, other sedatives):** Increased risk of profound sedation, respiratory depression, coma, and death.
* **CYP Enzyme Inhibitors/Inducers:** Lorazepam is primarily metabolized by glucuronidation, a pathway less affected by CYP enzymes. However, some interactions may still occur.
* **Valproic acid:** May increase lorazepam plasma concentrations.
## Monitoring
* Level of consciousness, respiratory rate, and oxygen saturation, especially with IV administration.
* Signs of withdrawal if abruptly discontinued after prolonged use.
* Mental status and cognitive function.
* Signs of dependence.
## Clinical Pearls
* Lorazepam's relatively long half-life can lead to cumulative effects, especially in the elderly or those with hepatic or renal impairment.
* Intramuscular absorption can be erratic. Intravenous administration is preferred for rapid effect.
* Avoid abrupt discontinuation due to potential for withdrawal symptoms, which can include rebound insomnia, anxiety, tremors, and seizures. Taper gradually.
* Paradoxical reactions are more common in children and the elderly.
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*Disclaimer: This information is intended for healthcare professionals and does not replace comprehensive drug literature or prescribing information. Always consult the current prescribing information and relevant clinical guidelines before making therapeutic decisions.*
