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# Lorazepam
## Overview
Lorazepam is a short-acting benzodiazepine with anxiolytic, sedative, hypnotic, and anticonvulsant properties. It enhances GABAergic neurotransmission.
## Primary Indications
* Management of anxiety disorders.
* Short-term relief of insomnia.
* Status epilepticus.
* Preoperative sedation.
## Adult Dosing
* **Anxiety:** 1-2 mg orally every 8 hours as needed. Maximum: 10 mg per day.
* **Insomnia:** 2-4 mg orally at bedtime.
* **Status Epilepticus:** 4 mg intravenously or intramuscularly. May repeat in 5-10 minutes, not to exceed 8 mg in a 24-hour period.
* **Preoperative Sedation:** 2-4 mg intramuscularly 2 hours before surgery, or 2-4 mg intravenously 30-60 minutes before surgery.
Dosing for specific indications may vary based on institutional protocols and patient response.
## Pediatric Dosing
Dosing in children is not well-established and should be approached with caution due to increased sensitivity to benzodiazepines.
* **Status Epilepticus:** 0.1 mg/kg intravenously or intramuscularly, not to exceed 4 mg per dose. May repeat once after 15-30 minutes.
* **Anxiety/Sedation:** Dosing is highly variable and generally not recommended for routine use. When used, the lowest effective dose should be administered.
## Dose Adjustments
* **Hepatic Impairment:** Use with caution; dose reduction may be necessary.
* **Renal Impairment:** No specific dose adjustment is typically recommended, but caution is advised.
* **Elderly:** Start with lower doses (e.g., 0.5 mg orally twice daily) and titrate slowly due to increased sensitivity and risk of sedation and falls.
## Contraindications
* Known hypersensitivity to lorazepam or other benzodiazepines.
* Acute narrow-angle glaucoma.
* Severe respiratory insufficiency.
* Severe hepatic insufficiency.
* Sleep apnea.
## Adverse Effects
Common: Drowsiness, dizziness, fatigue, unsteadiness, weakness, confusion.
Less common: Paradoxical excitation, amnesia, ataxia, depression, dysarthria, hypotension, visual disturbances.
Serious: Respiratory depression, paradoxical reactions, dependence, withdrawal symptoms.
## Key Drug Interactions
* **CNS Depressants (e.g., alcohol, opioids, other sedatives):** Increased risk of profound sedation, respiratory depression, coma, and death. Use concomitantly only when other therapeutic options are inadequate.
* **CYP Inhibitors/Inducers:** Lorazepam is primarily metabolized by glucuronidation, which is less affected by CYP enzymes; however, interactions are still possible.
* **Theophylline/Aminophylline:** May antagonize the sedative effects of lorazepam.
## Monitoring
* Monitor for level of sedation, respiratory rate, and blood pressure, especially with IV administration or in vulnerable patients.
* Assess for signs of paradoxical reactions, confusion, or cognitive impairment.
* Evaluate for signs of dependence and withdrawal if used long-term or abruptly discontinued.
## Clinical Pearls
* Lorazepam has a relatively rapid onset of action, especially when given intravenously or intramuscularly.
* Oral lorazepam has moderate bioavailability.
* Avoid abrupt discontinuation after prolonged use to prevent withdrawal symptoms. Tapering is recommended.
* It is often a preferred benzodiazepine for status epilepticus due to its slower onset of respiratory depression compared to diazepam and its favorable pharmacokinetic profile.
This information is intended for healthcare professionals. Always consult the most current prescribing information and local protocols before making clinical decisions.
