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# Lorazepam
## Overview
Lorazepam is a short-acting benzodiazepine with anxiolytic, sedative, hypnotic, and anticonvulsant properties.
## Primary Indications
* Anxiety disorders
* Insomnia due to anxiety
* Seizure management (status epilepticus)
* Premedication for surgical procedures
## Adult Dosing
* **Anxiety:** 0.5 mg to 2 mg orally every 6 to 8 hours. Maximum daily dose typically 10 mg.
* **Insomnia:** 2 mg to 4 mg orally at bedtime.
* **Status Epilepticus:** 4 mg intravenous (IV) or intramuscular (IM). May repeat after 5 to 10 minutes if needed. Maximum IV dose is 8 mg in a 12-hour period, but higher doses may be used in refractory cases under close medical supervision.
* **Premedication:** 1 mg to 4 mg orally or IM 2 hours before surgery, or 0.05 mg/kg IM 2 hours before surgery.
## Pediatric Dosing
* Dosing varies significantly by indication and patient age/weight. Consult specific pediatric guidelines.
* **Status Epilepticus:** 0.1 mg/kg IV/IM, not to exceed 4 mg per dose. May be repeated once after 5 to 10 minutes.
## Dose Adjustments
* **Hepatic Impairment:** Use with caution, may require lower doses.
* **Renal Impairment:** No specific adjustments are typically required, but monitor closely.
* **Elderly:** Initiate at the lower end of the adult dosage range and titrate slowly due to increased sensitivity and risk of CNS depression.
## Contraindications
* Hypersensitivity to lorazepam or other benzodiazepines.
* Acute narrow-angle glaucoma.
* Severe respiratory insufficiency.
* Severe hepatic insufficiency.
* Sleep apnea.
## Adverse Effects
* **Common:** Sedation, drowsiness, dizziness, weakness, unsteadiness, confusion.
* **Less Common:** Hypotension, respiratory depression, paradoxical excitement, anterograde amnesia, dependence, withdrawal symptoms.
## Key Drug Interactions
* **CNS Depressants (opioids, alcohol, other sedatives):** Additive CNS depression, increased risk of sedation, respiratory depression, and death.
* **CYP450 Inhibitors/Inducers:** Lorazepam is primarily metabolized by glucuronidation, so interactions via CYP450 are less common but can occur with potent inducers or inhibitors affecting other metabolic pathways.
* **Theophylline/Aminophylline:** May reduce the sedative effects of lorazepam.
## Monitoring
* Level of consciousness, respiratory rate, and blood pressure, especially with IV administration.
* Signs of withdrawal if dose is reduced or discontinued abruptly.
* Potential for abuse and dependence with prolonged use.
## Clinical Pearls
* Lorazepam has a relatively short half-life, which may be beneficial for avoiding prolonged sedation but can lead to more frequent dosing and potential withdrawal symptoms if stopped abruptly.
* Intramuscular absorption can be slower and more variable than oral or IV routes.
* Paradoxical reactions (e.g., agitation, aggression) can occur, particularly in elderly or pediatric patients.
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*Disclaimer: This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional protocols before administering any medication.*
