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# Lorazepam
## Overview
Lorazepam is a benzodiazepine with anxiolytic, sedative, hypnotic, amnestic, anticonvulsant, and muscle relaxant properties.
## Primary Indications
* Management of anxiety disorders
* Short-term management of insomnia characterized by difficulty falling or staying asleep
* Premedication for surgical procedures
* Treatment of status epilepticus
## Adult Dosing
* **Anxiety:** 0.5 mg to 2 mg orally every 8 hours as needed. Maximum daily dose typically not to exceed 10 mg.
* **Insomnia:** 1 mg to 2 mg orally at bedtime.
* **Premedication (Surgical):** 2 mg to 4 mg orally 2 hours before surgery.
* **Status Epilepticus:** 2 mg to 4 mg intravenously (IV) or intramuscularly (IM), may repeat every 5-10 minutes up to a maximum of 8 mg in a 24-hour period. Dosing can vary significantly based on institutional protocol.
## Pediatric Dosing
* **Anxiety/Sedation:** Use in pediatric patients is generally not recommended due to limited data and potential for adverse effects. If used, doses are highly individualized. For status epilepticus, IV/IM doses of 0.1 mg/kg (maximum 4 mg) have been reported. **Extreme caution and careful monitoring are warranted.**
* Dosing is often weight-based and specific to the indication. Consult pediatric-specific guidelines or experts.
## Dose Adjustments
* **Hepatic Impairment:** Use with caution; reduced doses may be necessary due to impaired metabolism.
* **Renal Impairment:** No specific dose adjustment, but use with caution as accumulation may occur.
* **Elderly:** Initiate with lower doses (e.g., 0.5 mg orally twice daily) and titrate cautiously. Higher doses may increase risk of sedation, confusion, and falls.
## Contraindications
* Known hypersensitivity to benzodiazepines
* Acute narrow-angle glaucoma
* Severe respiratory insufficiency
* Severe hepatic insufficiency
* Myasthenia gravis (use with caution)
* History of previous intolerance or paradoxical reaction
## Adverse Effects
* **Common:** Drowsiness, dizziness, fatigue, ataxia, weakness, confusion.
* **Less Common:** Amnesia, blurred vision, gastrointestinal upset, paradoxical excitation, respiratory depression (especially with rapid IV administration or in combination with other CNS depressants).
* **Serious:** Severe respiratory depression, withdrawal symptoms upon abrupt discontinuation, dependence, abuse potential.
## Key Drug Interactions
* **CNS Depressants (e.g., opioids, alcohol, other sedatives, antihistamines):** Additive CNS depression, increased risk of respiratory depression, profound sedation, coma, and death. **Concomitant use requires extreme caution, dose reduction, and close monitoring.**
* **Theophylline/Aminophylline:** May decrease the sedative effects of lorazepam.
* **Valproic acid:** May increase lorazepam levels.
## Monitoring
* Sedation levels
* Respiratory rate and depth
* Blood pressure and heart rate (especially with IV administration)
* Cognitive function
* Signs of dependence or withdrawal if used long-term
## Clinical Pearls
* Lorazepam has a relatively long half-life and is metabolized by glucuronidation, which is less affected by hepatic enzyme induction or inhibition compared to other benzodiazepines.
* IV lorazepam should be administered slowly (e.g., 2 mg over 2 minutes) to minimize the risk of respiratory depression and hypotension.
* Avoid abrupt discontinuation after prolonged use due to the risk of withdrawal symptoms (anxiety, insomnia, tremors, seizures). Tapering is recommended.
* Consider the potential for dependence and abuse, especially in patients with a history of substance abuse.
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*This information is intended for healthcare professionals. Always consult the most current prescribing information and relevant guidelines before making clinical decisions.*
