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# Lorazepam
## Overview
Lorazepam is a benzodiazepine with anxiolytic, sedative, hypnotic, and anticonvulsant properties. It is metabolized by glucuronidation, bypassing the cytochrome P450 system.
## Primary Indications
* Anxiety disorders
* Insomnia due to anxiety
* Seizure management (status epilepticus)
* Premedication for medical procedures
## Adult Dosing
* **Anxiety:** 1-4 mg orally every 6-8 hours as needed. Maximum 10 mg/day.
* **Insomnia:** 2-4 mg orally at bedtime.
* **Status Epilepticus:** 4 mg intravenously (IV) or intramuscularly (IM). Repeat in 5-10 minutes if needed, up to a maximum of 8 mg in a 12-hour period. Dosing may vary based on specific protocols and patient response.
* **Premedication:** 1-4 mg orally or IV/IM 1-2 hours before procedure.
## Pediatric Dosing
Dosing in pediatric patients is not well-established and should be individualized based on weight, clinical response, and age.
* **Seizure Management:** Typically 0.05-0.1 mg/kg IV/IM up to a maximum of 4 mg per dose. Dosing varies significantly by age and indication.
## Dose Adjustments
* **Hepatic Impairment:** Use with caution, may require dose reduction.
* **Renal Impairment:** No specific dose adjustment recommended, but use with caution.
* **Elderly:** Start with lower doses (e.g., 0.5-1 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 (though use is possible with caution).
* Myasthenia gravis.
## Adverse Effects
Common: Sedation, dizziness, weakness, unsteadiness, confusion.
Less common: Hypotension, respiratory depression (especially with IV administration or in combination with other CNS depressants), amnesia, paradoxical excitation, paradoxical worsening of seizures.
## Key Drug Interactions
* **CNS Depressants (alcohol, opioids, barbiturates, antihistamines):** Additive sedative and respiratory depressant effects. Increased risk of severe sedation, respiratory depression, coma, and death. Co-administration should be avoided or closely monitored with dose reduction.
* **Theophylline/Aminophylline:** May reduce lorazepam's sedative effects.
## Monitoring
* Level of consciousness and sedation.
* Respiratory rate and oxygen saturation.
* Blood pressure.
* Signs of withdrawal upon discontinuation.
* Risk of falls, especially in elderly patients.
## Clinical Pearls
* Lorazepam has a relatively intermediate half-life compared to other benzodiazepines.
* Intramuscular absorption can be erratic; intravenous administration is preferred for rapid effect when available.
* Avoid abrupt discontinuation to minimize withdrawal symptoms. Taper slowly over weeks to months.
* Use the lowest effective dose for the shortest duration necessary.
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_This information is intended for healthcare professionals. Always consult the most current prescribing information and relevant clinical guidelines before making treatment decisions._
