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# Lorazepam
## Overview
Lorazepam is a short-acting benzodiazepine used for its anxiolytic, sedative, hypnotic, and anticonvulsant properties.
## Primary Indications
* Anxiety disorders
* Insomnia (short-term treatment)
* Status epilepticus
* Premedication for surgical procedures
* Management of acute agitation
## Adult Dosing
* **Anxiety:** 0.5 mg to 2 mg orally every 6 to 8 hours. Maximum dose typically 10 mg/day.
* **Insomnia:** 2 mg to 4 mg orally at bedtime. Not recommended for long-term use.
* **Status Epilepticus:** 4 mg intramuscularly or intravenously. May be repeated after 10 to 15 minutes if seizures persist. Maximum dose 8 mg.
* **Premedication:** 2 mg to 4 mg intramuscularly 2 hours before surgery, or 1 mg to 2 mg intravenously 15 to 30 minutes before surgery.
* **Acute Agitation:** 0.5 mg to 2 mg orally or intramuscularly every 4 to 6 hours as needed.
## Pediatric Dosing
Dosing in pediatrics is highly variable and depends on indication and age.
* **Status Epilepticus:** 0.05 mg/kg intravenously, not to exceed 4 mg per dose. May be repeated once after 10 to 15 minutes if seizures persist.
* **Anxiety/Sedation:** Dosing is not well established and should be individualized. Use with caution.
## Dose Adjustments
* **Hepatic Impairment:** Use with caution; dose reduction may be necessary.
* **Renal Impairment:** No specific dose adjustment is usually recommended, but monitor for increased sedation.
* **Elderly:** Lower initial doses and slower titration are recommended due to increased sensitivity to CNS effects.
## Contraindications
* Known hypersensitivity to benzodiazepines or any component of the formulation.
* Acute narrow-angle glaucoma.
* Concurrent use of potent CYP3A4 inhibitors.
## Adverse Effects
Common adverse effects include drowsiness, dizziness, weakness, and unsteadiness. Less common effects include confusion, depression, and paradoxical excitement. Respiratory depression can occur, especially with IV administration or when combined with other CNS depressants.
## Key Drug Interactions
* **CNS Depressants (opioids, alcohol, other sedatives):** Additive CNS depression, leading to profound sedation, respiratory depression, coma, and death.
* **CYP3A4 Inhibitors (e.g., ketoconazole, ritonavir):** May increase lorazepam plasma concentrations.
* **Valproic Acid:** May decrease lorazepam clearance, potentially increasing serum concentrations.
## Monitoring
* Monitor for sedation, respiratory rate, and blood pressure, especially with IV administration.
* Assess for paradoxical reactions.
* Evaluate for signs of dependence or withdrawal with prolonged use.
## Clinical Pearls
* Lorazepam has a relatively rapid onset of action, particularly when given intravenously or intramuscularly.
* It has no active metabolites, which may be advantageous in patients with hepatic or renal impairment compared to other benzodiazepines.
* Taper dosage gradually when discontinuing to avoid withdrawal symptoms.
* Intramuscular injection is generally well absorbed.
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*Disclaimer: This information is intended for healthcare professionals. Always consult the most current prescribing information and relevant literature before making clinical decisions. Dosing may vary based on patient-specific factors and local protocols.*
