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# Lorazepam
## Overview
Lorazepam is a short-acting benzodiazepine with anxiolytic, sedative, hypnotic, and anticonvulsant properties. It is primarily metabolized in the liver via glucuronidation and excreted by the kidneys.
## Primary Indications
* Management of anxiety disorders
* Short-term relief of insomnia
* Management of status epilepticus
* Premedication for surgical procedures
## Adult Dosing
* **Anxiety Disorders:** Typically 1-4 mg orally divided into 2-3 doses daily. Maximum dose is usually 10 mg/day.
* **Insomnia:** 1-2 mg orally at bedtime.
* **Status Epilepticus:** 2-4 mg IV/IM. May be repeated every 5-10 minutes up to a maximum of 8 mg in a 12-hour period.
* **Premedication:** 1-4 mg orally or IV/IM several hours before surgery.
Dosing should be individualized and titrated to the lowest effective dose.
## Pediatric Dosing
Dosing in pediatric patients is not well-established and requires careful consideration due to increased sensitivity and potential for respiratory depression.
* **Status Epilepticus:** 0.05-0.1 mg/kg IV/IM, not to exceed 4 mg per dose. Repeat doses may be given cautiously.
* **Anxiety/Sedation:** Dosing is highly variable and should be guided by clinical response and local protocol.
## Dose Adjustments
* **Hepatic Impairment:** Use with caution. Dose reduction may be necessary.
* **Renal Impairment:** No specific dose adjustment, but monitor for increased sensitivity.
* **Elderly:** Start with lower doses (e.g., 0.5-1 mg BID) and titrate cautiously due to increased sensitivity to CNS effects.
## Contraindications
* Known hypersensitivity to lorazepam or other benzodiazepines.
* Acute narrow-angle glaucoma.
* Severe respiratory insufficiency.
* Severe liver insufficiency.
* Myasthenia gravis.
* Sleep apnea.
## Adverse Effects
Common adverse effects include drowsiness, dizziness, weakness, and unsteadiness. Less common but serious effects include respiratory depression, paradoxical excitation, amnesia, dependence, and withdrawal symptoms.
## Key Drug Interactions
* **CNS Depressants (e.g., opioids, alcohol, barbiturates, other sedatives):** Increased risk of sedation, respiratory depression, profound sedation, coma, and death. Use concurrently only when other therapeutic options are inadequate; limit dose and duration, and monitor closely for respiratory depression.
* **Theophylline/Aminophylline:** May antagonize the sedative effects of lorazepam.
## Monitoring
* Mental status and level of consciousness
* Respiratory rate and depth
* Blood pressure
* Signs of dependence or withdrawal
## Clinical Pearls
* Lorazepam is a potent benzodiazepine. Start low and go slow, especially in elderly patients or those with comorbid conditions.
* Due to its relatively short half-life, it may be preferred for intermittent anxiety or acute agitation.
* Avoid abrupt discontinuation to prevent withdrawal symptoms. Taper gradually if long-term use.
* Oral administration has a slower onset but prolonged effect compared to IV/IM. IV administration can cause hypotension and respiratory depression.
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*Please verify current prescribing information and institutional guidelines before making clinical decisions.*
