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# Lorazepam
## Overview
Lorazepam is a benzodiazepine medication with sedative, hypnotic, anxiolytic, anticonvulsant, and muscle relaxant properties.
## Primary Indications
* Anxiety disorders
* Insomnia due to anxiety
* Status epilepticus
* Premedication for surgical procedures
* Management of agitation
## Adult Dosing
* **Anxiety:** 0.5 mg to 2 mg orally every 6 to 8 hours as needed. Maximum daily dose typically 10 mg.
* **Insomnia:** 2 mg to 4 mg orally at bedtime.
* **Status Epilepticus:** 4 mg intravenous (IV) or IM. May repeat in 5 to 10 minutes if seizure persists. Maximum initial dose 8 mg.
* **Premedication:** 2 mg to 4 mg IM or IV 2 hours prior to surgery.
* **Agitation:** 0.5 mg to 4 mg IM or IV. Dosing is individualized based on patient response and severity of agitation.
**Note:** For IV administration, the rate of injection should be slow (e.g., 2 mg/minute) to avoid respiratory depression.
## Pediatric Dosing
Dosing in pediatric patients is less well-established and should be individualized under expert guidance.
* **Status Epilepticus:** 0.1 mg/kg IV (maximum 4 mg per dose). May be repeated once after 5 to 10 minutes if seizure persists.
* **Sedation/Anxiety:** Dosing varies widely based on indication and age. Oral doses often range from 0.02 to 0.05 mg/kg/dose every 6-8 hours.
## Dose Adjustments
* **Hepatic Impairment:** Use with caution; may require dose reduction.
* **Renal Impairment:** No specific dose adjustment recommended, but monitor for increased sedation.
* **Elderly:** Start with lower doses (e.g., 0.5 mg twice daily) and titrate cautiously due to increased sensitivity and risk of side effects.
## Contraindications
* Known hypersensitivity to benzodiazepines or any component of the formulation.
* Acute angle-closure glaucoma.
* Severe respiratory insufficiency.
* Severe hepatic insufficiency.
## Adverse Effects
Common: Drowsiness, dizziness, sedation, weakness, ataxia, confusion.
Less common: Hypotension, paradoxical excitement, amnesia, respiratory depression (especially with IV administration or in combination with other CNS depressants).
## Key Drug Interactions
* **CNS Depressants (opioids, alcohol, other sedatives):** Additive CNS depression, respiratory depression, coma, and death. Use extreme caution and consider dose reduction of one or both agents.
* **Theophylline/Aminophylline:** May decrease the sedative effects of lorazepam.
* **Valproic acid:** May increase plasma concentrations of lorazepam.
## Monitoring
* Respiratory rate and oxygen saturation, especially with IV administration or in combination with other CNS depressants.
* Level of consciousness and sedation.
* Signs of dependence and withdrawal with long-term use.
* Liver function tests periodically.
## Clinical Pearls
* Lorazepam has a longer half-life than some other benzodiazepines, but its clinical effects are often shorter.
* Intravenous lorazepam can cause pain and phlebitis at the injection site.
* Avoid abrupt discontinuation after prolonged use due to risk of withdrawal symptoms. Tapering is recommended.
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*Disclaimer: This information is intended for clinical decision-making support only. Always consult the most current prescribing information and relevant clinical guidelines for definitive patient care decisions.*
