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# Lorazepam
## Overview
Lorazepam is a benzodiazepine with anxiolytic, sedative, hypnotic, and anticonvulsant properties. It is primarily metabolized by glucuronidation, with minimal hepatic enzyme induction.
## Primary Indications
* Anxiety disorders
* Insomnia
* Seizure management (status epilepticus)
* Premedication for surgical procedures
* Management of agitation
## Adult Dosing
* **Anxiety:** 0.5 mg to 2 mg orally every 8 hours as needed.
* **Insomnia:** 2 mg to 4 mg orally at bedtime.
* **Status Epilepticus:** 4 mg intravenously or intramuscularly. May repeat in 5 to 10 minutes if seizures persist, not to exceed 8 mg in a 12-hour period. Dosing may vary based on protocol.
* **Premedication:** 1 mg to 4 mg orally or intravenously 1 to 2 hours before surgery.
* **Agitation:** 1 mg to 4 mg intravenously or intramuscularly. May repeat every 5 to 10 minutes as needed, not to exceed 10 mg in a 24-hour period.
## Pediatric Dosing
* Dosing in pediatric patients is not well-established and should be guided by clinical response and careful titration.
* **Status Epilepticus:** 0.1 mg/kg intravenously, not to exceed 4 mg per dose. May repeat in 5 to 10 minutes if seizures persist.
## Dose Adjustments
* **Hepatic Impairment:** Use with caution; dose reduction may be necessary.
* **Renal Impairment:** No specific dose adjustment is typically required, but use with caution.
* **Elderly:** Initiate at the lower end of the adult dose range (e.g., 0.5 mg orally once or twice daily) and titrate cautiously.
## Contraindications
* Known hypersensitivity to lorazepam or other benzodiazepines.
* Acute narrow-angle glaucoma.
* Severe respiratory insufficiency.
* Severe hepatic insufficiency.
## Adverse Effects
* **Common:** Sedation, dizziness, weakness, unsteadiness, ataxia.
* **Less Common:** Confusion, depression, anterograde amnesia, paradoxical reactions (e.g., excitement, rage), respiratory depression (especially with IV administration or in combination with other CNS depressants).
* **Withdrawal:** Can occur with abrupt discontinuation after prolonged use, characterized by rebound anxiety, insomnia, tremors, and in severe cases, seizures.
## Key Drug Interactions
* **CNS Depressants (e.g., opioids, alcohol, other sedatives):** Potentiates CNS depression, leading to increased sedation, respiratory depression, and potentially fatal outcomes. Use extreme caution and consider dose reduction of one or both agents.
* **Theophylline, Aminophylline:** May reduce the sedative effects of lorazepam.
## Monitoring
* Sedation level, respiratory rate, and blood pressure, especially with parenteral administration or in combination with other CNS depressants.
* Signs of withdrawal if the patient is being discontinued from therapy.
* Mental status and effectiveness of treatment for anxiety or agitation.
## Clinical Pearls
* Lorazepam has a relatively long half-life compared to some other benzodiazepines, but its intermediate onset of action makes it suitable for various indications.
* Intramuscular administration is generally well-absorbed.
* For IV administration, it is recommended to inject slowly to minimize respiratory depression and hypotension.
* Avoid abrupt discontinuation; taper dose gradually to minimize withdrawal symptoms.
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*Please verify the current prescribing information for the most up-to-date and complete drug information.*
