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# Lorazepam
## Overview
Lorazepam is a benzodiazepine with anxiolytic, sedative, hypnotic, amnestic, and anticonvulsant properties.
## Primary Indications
* Anxiety disorders
* Insomnia (short-term treatment)
* Seizure management (status epilepticus)
* Premedication for procedures
* Sedation in intensive care settings
## Adult Dosing
* **Anxiety:** 0.5 mg to 2 mg orally every 6-8 hours as needed. Maximum daily dose typically 10 mg.
* **Insomnia:** 1 mg to 2 mg orally at bedtime.
* **Status Epilepticus:** 4 mg intravenously (IV) or intramuscularly (IM). A second dose of 4 mg may be administered 5-10 minutes after the first if seizures persist. Maximum IV dose is generally 8 mg in a 24-hour period, but higher doses may be used in status epilepticus under close monitoring.
* **Premedication:** 2 mg to 4 mg orally or IM 2 hours before surgery.
* **ICU Sedation:** 0.02 mg/kg to 0.04 mg/kg IV bolus, followed by infusion of 0.03 mg/kg/hour to 0.1 mg/kg/hour. Titrate to desired level of sedation.
## Pediatric Dosing
* **Anxiety:** Dosing is highly variable and should be individualized based on weight, age, and clinical response. Oral doses typically range from 0.02 mg/kg to 0.06 mg/kg per dose, divided every 6-8 hours. Maximum daily dose is generally 4 mg.
* **Status Epilepticus:** 0.1 mg/kg IV/IM, maximum 4 mg per dose. May repeat once after 5-10 minutes if seizures persist.
* **Sedation (ICU):** Dosing is highly variable. An initial IV bolus of 0.02 mg/kg may be given, followed by an infusion. Titrate to desired effect.
## Dose Adjustments
* **Hepatic Impairment:** Use with caution, dose reduction may be necessary.
* **Renal Impairment:** No specific dose adjustment, but use with caution.
## Contraindications
* Known hypersensitivity to benzodiazepines
* Acute narrow-angle glaucoma
* Severe respiratory insufficiency
* Severe hepatic insufficiency
* Sleep apnea syndrome
## Adverse Effects
* **Common:** Sedation, drowsiness, dizziness, weakness, unsteadiness.
* **Less Common:** Confusion, depression, amnesia, paradoxical excitation, respiratory depression (especially with IV administration or in combination with other CNS depressants).
* **Rare:** Hypersensitivity reactions, blood dyscrasias.
## Key Drug Interactions
* **CNS Depressants (opioids, alcohol, other sedatives/hypnotics):** Increased risk of profound sedation, respiratory depression, coma, and death.
* **CYP2C19 Inhibitors/Inducers:** May affect lorazepam metabolism, though clinically significant interactions are less common for lorazepam compared to other benzodiazepines.
* **Valproic acid:** May increase lorazepam levels.
## Monitoring
* Level of consciousness and sedation.
* Respiratory rate and oxygen saturation.
* Blood pressure.
* Signs of withdrawal upon discontinuation.
## Clinical Pearls
* Lorazepam has intermediate half-life.
* Intramuscular absorption can be erratic; IV is preferred for acute management of seizures.
* Avoid abrupt discontinuation to prevent withdrawal symptoms. Tapering is recommended.
* Use the lowest effective dose for the shortest duration necessary, especially for anxiety and insomnia.
* Caution in elderly patients due to increased sensitivity to CNS effects and increased risk of falls.
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*This information is intended for clinical use and does not replace the official prescribing information. Always verify current drug information with the manufacturer's product monograph or other reliable resources before making clinical decisions.*
