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# Lorazepam (Representative Benzodiazepine)
## Overview
Lorazepam is a short-to-intermediate acting benzodiazepine with sedative, hypnotic, anxiolytic, anticonvulsant, and muscle relaxant properties.
## Primary Indications
* Anxiety disorders
* Insomnia (short-term treatment)
* Status epilepticus (second-line agent)
* Preoperative sedation and anxiolysis
## Adult Dosing
* **Anxiety:** 0.5 mg to 2 mg orally 2 to 3 times daily. Maximum dose typically 10 mg/day, though higher doses may be used in specific inpatient settings.
* **Insomnia:** 1 mg to 2 mg orally at bedtime.
* **Status Epilepticus:** 2 mg to 4 mg IV, slow push, repeated every 5 to 10 minutes as needed. Maximum dose is typically 8 mg for the initial loading dose, but can be higher depending on protocol.
* **Preoperative:** 1 mg to 2 mg IM or IV 1 to 2 hours before surgery.
## Pediatric Dosing
* **Anxiety:** Dosing varies significantly by age and indication. For ages 12 years and older, similar to adults. For younger children, specific dosing often requires consultation with pediatric specialists. There is no established FDA-approved dose for children under 12 years for anxiety disorders.
* **Status Epilepticus:** 0.05 mg/kg IV over 2 to 5 minutes, maximum of 4 mg per dose. Repeat once after 5 to 10 minutes if seizures persist. (Note: some sources may cite slightly different weight-based dosing or maximums. Consult local protocol).
## Dose Adjustments
* **Hepatic Impairment:** Use with caution; dose reduction may be necessary.
* **Renal Impairment:** Use with caution; dose reduction may be necessary, especially in severe impairment.
## Contraindications
* Known hypersensitivity to lorazepam or other benzodiazepines.
* Acute angle-closure glaucoma.
* Severe respiratory insufficiency.
* Severe hepatic insufficiency.
* Myasthenia gravis.
## Adverse Effects
* **Common:** Drowsiness, dizziness, weakness, unsteadiness, confusion.
* **Serious:** Respiratory depression, paradoxical reactions (e.g., excitement, agitation), amnesia, dependence, withdrawal symptoms.
## Key Drug Interactions
* **CNS Depressants (e.g., opioids, alcohol, other sedatives):** Increased risk of profound sedation, respiratory depression, coma, and death. Avoid concomitant use or use with extreme caution and the lowest effective doses for the shortest duration.
* **CYP450 Inhibitors/Inducers:** Lorazepam is primarily metabolized by glucuronidation, so interactions with CYP450 enzymes are less significant compared to other benzodiazepines. However, agents that affect glucuronidation could theoretically alter clearance.
## Monitoring
* Sedation level
* Respiratory rate and oxygen saturation
* Signs of paradoxical reactions
* Signs of withdrawal if discontinued abruptly after prolonged use
* Cognitive function
## Clinical Pearls
* Lorazepam's IM absorption is reliable and relatively rapid.
* It is often preferred in hepatic impairment due to its metabolism via glucuronidation, bypassing extensive CYP450 pathways.
* Intravenous lorazepam should be administered slowly to avoid respiratory depression and hypotension.
* Abrupt discontinuation can lead to withdrawal symptoms, including anxiety, insomnia, tremors, and seizures. Tapering is recommended.
* Risk of dependence increases with duration of use and higher doses.
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*Disclaimer: This information is intended for clinical use and does not replace comprehensive drug information resources. Always verify current prescribing information and consult institutional protocols before administering medications.*
