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# Lorazepam
## Overview
Lorazepam is a benzodiazepine with anxiolytic, sedative, hypnotic, amnestic, anticonvulsant, and muscle relaxant properties. It acts by enhancing the effect of the neurotransmitter gamma-aminobutyric acid (GABA) at the GABAA receptor.
## Primary Indications
* Anxiety disorders
* Insomnia due to anxiety or transient situational stress
* Status epilepticus (IV/IM)
* Premedication for surgical procedures
* Management of agitation
## Adult Dosing
* **Anxiety:** 0.5-2 mg orally every 6-8 hours as needed. Maximum dose typically 10 mg per day.
* **Insomnia:** 2-4 mg orally at bedtime.
* **Status Epilepticus:** 4 mg IV/IM. May repeat dose every 5-10 minutes up to a maximum of 0.1 mg/kg or 4 mg total in the first hour. Further doses may be administered based on clinical response and physician discretion.
* **Premedication:** 2-4 mg orally or IM 2 hours before surgery, or 2 mg IV 15-30 minutes before induction of anesthesia.
* **Agitation (IM/IV):** 0.02-0.05 mg/kg (up to 4 mg) IM or slow IV every 2-6 hours as needed.
Dosing for specific indications like agitation in critical care settings may vary based on institutional protocols.
## Pediatric Dosing
* **Anxiety/Sedation:** Dosing is highly variable and should be individualized. Oral doses are generally in the range of 0.02-0.06 mg/kg/day divided into 2-3 doses.
* **Status Epilepticus:** 0.1 mg/kg IV/IM, not to exceed 4 mg. May repeat after 5-10 minutes.
Parenteral lorazepam use in pediatric patients requires careful dose titration and close monitoring.
## Dose Adjustments
* **Hepatic Impairment:** Use with caution, may require reduced doses.
* **Renal Impairment:** No specific dose adjustment recommended, but use with caution.
* **Elderly:** Initiate at lower doses (e.g., 0.5 mg orally twice daily) and titrate cautiously due to increased sensitivity to CNS effects and risk of falls.
## Contraindications
* Known hypersensitivity to benzodiazepines or any component of the formulation.
* Acute angle-closure glaucoma.
* Severe respiratory insufficiency.
* Severe hepatic insufficiency.
* Sleep apnea.
## Adverse Effects
Common adverse effects include drowsiness, dizziness, sedation, unsteadiness, and weakness. Other potential effects include amnesia, confusion, ataxia, blurred vision, and paradoxical reactions (e.g., excitement, aggression). Respiratory depression is a risk, especially with IV administration or in combination with other CNS depressants.
## Key Drug Interactions
* **CNS Depressants (e.g., opioids, alcohol, other sedatives, antihistamines):** Additive CNS depression, potentiating sedation, respiratory depression, and coma. Co-administration should be avoided if possible. If necessary, use lowest doses and shortest duration, and monitor closely for respiratory depression.
* **Theophylline, Aminophylline:** May reduce the sedative effects of lorazepam.
* **Valproic Acid:** May increase lorazepam plasma concentrations and increase the risk of toxicity.
## Monitoring
* **CNS effects:** Sedation, dizziness, cognitive impairment.
* **Respiratory status:** Especially with parenteral administration or in patients with respiratory compromise.
* **Paradoxical reactions:** Monitor for increased agitation or aggression.
* **Dependence and withdrawal:** Monitor for signs of tolerance or withdrawal symptoms upon discontinuation, particularly with prolonged use.
## Clinical Pearls
* Lorazepam has a relatively long half-life, which can contribute to prolonged sedation.
* Intramuscular (IM) absorption can be unpredictable. Intravenous (IV) administration is preferred for rapid effect and predictable absorption, but carries a higher risk of respiratory depression.
* Avoid abrupt discontinuation after prolonged use to prevent withdrawal symptoms. Taper the dose gradually.
* Be cautious in elderly patients; increased sensitivity to side effects and risk of falls.
* Not recommended for long-term management of chronic psychosis or as a primary treatment for depression.
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*This information is intended for healthcare professionals. Always consult the most current prescribing information and relevant guidelines for complete and up-to-date details.*
