Please check your internet connection and try again.
# Lorazepam
## Overview
Lorazepam is a benzodiazepine with anxiolytic, sedative, hypnotic, amnestic, and anticonvulsant properties. It acts by potentiating the effect of the neurotransmitter gamma-aminobutyric acid (GABA) at the GABA-A receptor.
## Primary Indications
* Anxiety disorders
* Insomnia
* Seizure management (status epilepticus)
* Premedication for surgical procedures
* Sedation in intensive care settings
## Adult Dosing
* **Anxiety:** Typically 0.5 mg to 2 mg orally 2 to 3 times daily. Maximum: 10 mg per day.
* **Insomnia:** Typically 2 mg to 4 mg orally at bedtime.
* **Status Epilepticus:** 4 mg intravenously or intramuscularly, repeated every 10 to 20 minutes as needed. Maximum: 8 mg in a 12-hour period.
* **Premedication:** 2 mg to 4 mg orally or intramuscularly 2 hours before surgery.
* **ICU Sedation:** Titrated based on patient response, usually starting at 0.5 mg to 1 mg intravenously every 5 to 10 minutes until desired level of sedation is achieved. Maintenance infusion may be used.
Dosing for specific indications may vary based on institutional protocols.
## Pediatric Dosing
Dosing in pediatric patients is less established and should be done with caution, often at lower doses and with careful titration.
* **Seizure Management:** 0.05 mg/kg to 0.1 mg/kg intravenously, maximum 4 mg per dose. May be repeated every 5 to 10 minutes.
* **Sedation:** Dosing is highly variable and dependent on age, weight, and clinical context.
## Dose Adjustments
* **Hepatic Impairment:** Use with caution; dosage reduction may be necessary.
* **Renal Impairment:** No specific dose adjustment is typically recommended, but caution and monitoring are advised.
## Contraindications
* Known hypersensitivity to lorazepam or other benzodiazepines
* Severe respiratory insufficiency
* Severe hepatic insufficiency
* Acute narrow-angle glaucoma
## Adverse Effects
Common adverse effects include drowsiness, dizziness, sedation, ataxia, weakness, and confusion. Less common effects include paradoxical excitement, amnesia, hypotension, and respiratory depression (especially with parenteral administration or in combination with other CNS depressants).
## Key Drug Interactions
* **CNS Depressants (e.g., opioids, alcohol, other benzodiazepines, barbiturates, antihistamines):** Additive CNS depression, sedation, respiratory depression, and potential for coma. Use with extreme caution or avoid.
* **Theophyllines, Aminophylline:** May reduce the sedative effects of lorazepam.
* **Valproic acid:** May increase lorazepam plasma concentrations.
## Monitoring
* Level of sedation and respiratory status, particularly with IV administration or in elderly/debilitated patients.
* Signs of paradoxical reactions.
* Signs of dependence and withdrawal if used long-term; gradual tapering is recommended upon discontinuation.
## Clinical Pearls
* Lorazepam has a relatively longer half-life compared to some other benzodiazepines, but its active metabolite is minimal.
* Intramuscular absorption can be slower and less predictable than intravenous.
* It is often considered a preferred benzodiazepine for parenteral use due to its pharmacokinetic profile.
* Avoid abrupt discontinuation, especially after prolonged use, due to the risk of withdrawal symptoms.
---
*Disclaimer: This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional guidelines for complete details before making therapeutic decisions.*
