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# Lorazepam
## Overview
Lorazepam is a short-acting benzodiazepine with anxiolytic, sedative, hypnotic, and anticonvulsant properties.
## Primary Indications
* Anxiety disorders
* Insomnia (short-term treatment)
* Status epilepticus
* Preoperative sedation and amnesia
## Adult Dosing
* **Anxiety:** 0.5 mg to 2 mg orally every 6 to 8 hours. Maximum daily dose generally 10 mg.
* **Insomnia:** 2 mg to 4 mg orally at bedtime. Not recommended for long-term use.
* **Status Epilepticus (IV/IM):** 4 mg. Repeat in 5 to 10 minutes if seizures persist, not to exceed 8 mg in a 12-hour period.
* **Preoperative Sedation (IM):** 0.0625 mg/kg (max 4 mg) given 2 hours before surgery.
* **Premedication for Anxiety (PO/IM/IV):** 1 mg to 4 mg 1 to 2 hours before procedure.
Dosing for specific indications may vary based on institutional protocols.
## Pediatric Dosing
* **Status Epilepticus (IV):** 0.1 mg/kg (max 4 mg) per dose. Repeat in 5 to 10 minutes if seizures persist, not to exceed 0.2 mg/kg or 8 mg total in a 12-hour period.
* **Anxiety/Sedation:** Dosing is highly variable and generally not recommended for routine use in children due to limited data and potential for paradoxical reactions. For specific situations (e.g., procedural sedation), doses are often in the range of 0.02 mg/kg to 0.1 mg/kg orally or IM, but this requires careful consideration and close monitoring.
## Dose Adjustments
* **Hepatic Impairment:** Use with caution, may require dose reduction.
* **Renal Impairment:** No specific dose adjustment recommended, but use with caution.
* **Elderly:** Initiate at the lower end of the dosage range (e.g., 0.5 mg orally twice daily) and titrate slowly due to increased sensitivity and risk of side effects like sedation and falls.
## Contraindications
* Hypersensitivity to lorazepam or other benzodiazepines.
* Acute narrow-angle glaucoma.
* Severe respiratory insufficiency.
* Severe hepatic insufficiency.
* Myasthenia gravis.
* Sleep apnea syndrome.
## Adverse Effects
Common: Drowsiness, dizziness, weakness, ataxia, confusion, sedation, impaired coordination.
Serious: Respiratory depression, paradoxical reactions (e.g., excitation, aggression), dependence, withdrawal symptoms, anterograde amnesia, hypotension.
## Key Drug Interactions
* **CNS Depressants (alcohol, opioids, other sedatives):** Additive CNS depression, increased risk of respiratory depression and sedation.
* **Valproic acid:** May decrease lorazepam clearance, potentially increasing lorazepam levels. Consider dose reduction of lorazepam.
* **Theophylline/Aminophylline:** May antagonize the sedative effects of benzodiazepines.
## Monitoring
* Assess for therapeutic response (e.g., reduction in anxiety, seizure control, adequate sedation).
* Monitor for adverse effects, particularly sedation, dizziness, respiratory rate, and mental status.
* Monitor for signs of dependence and withdrawal, especially with prolonged use or abrupt discontinuation.
## Clinical Pearls
* Lorazepam has a relatively short half-life compared to other benzodiazepines, making it suitable for acute situations but potentially requiring more frequent dosing for chronic anxiety.
* Intravenous lorazepam should be administered slowly (e.g., 2 mg/min) to minimize the risk of respiratory depression and hypotension.
* Avoid abrupt discontinuation; taper gradually to minimize withdrawal symptoms.
* Use with caution in the elderly due to increased risk of falls and cognitive impairment.
* Paradoxical reactions are more common in children and the elderly.
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*This information is intended for clinical use and does not substitute for consulting the most current prescribing information or local institutional guidelines.*
