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# Lorazepam (Benzodiazepine)
## Overview
Lorazepam is a short-acting benzodiazepine with anxiolytic, sedative, hypnotic, and anticonvulsant properties. It acts by potentiating the effect of the inhibitory neurotransmitter gamma-aminobutyric acid (GABA).
## Primary Indications
* Anxiety disorders
* Insomnia (short-term treatment)
* Status epilepticus (adjunct treatment)
* Sedation/anxiolysis in procedural settings
* Management of agitation
## Adult Dosing
* **Anxiety:** 1-4 mg orally every 6-8 hours as needed.
* **Insomnia:** 2-4 mg orally at bedtime.
* **Status Epilepticus:** 4 mg IV/IM initially. May repeat dose by 4 mg IV/IM every 5-10 minutes if seizures persist, not to exceed 8 mg in a single status epilepticus episode.
* **Preoperative Sedation/Anxiolysis:** 2-4 mg IM 2 hours before surgery.
* **Procedural Sedation:** 0.044 mg/kg IV (max 4 mg) not to exceed 2 mg per dose.
Dosing for agitation, specific procedural sedation, and intra-articular injection will vary and should be guided by clinical assessment and local protocols.
## Pediatric Dosing
Dosing in pediatric patients is highly variable and often requires careful titration. There is less established data for pediatric use compared to adults.
* **Status Epilepticus:** 0.1 mg/kg IV/IM (max 4 mg per dose), may repeat every 5-10 minutes.
* **Preoperative Sedation:** 0.02-0.05 mg/kg IM (max 4 mg).
* **Anxiety:** Dosing is not well-established. Generally, the lowest effective dose should be used.
## Dose Adjustments
* **Hepatic Impairment:** Use with caution, dose reduction may be necessary.
* **Renal Impairment:** No specific dose adjustment is typically recommended, but caution is advised.
## Contraindications
* Known hypersensitivity to benzodiazepines or lorazepam.
* Acute narrow-angle glaucoma.
* Severe respiratory insufficiency.
* Severe hepatic insufficiency.
* Sleep apnea syndrome.
## Adverse Effects
Common: Drowsiness, dizziness, weakness, unsteadiness, ataxia.
Serious: Respiratory depression, paradoxical reactions (e.g., excitement, aggression), dependence, withdrawal symptoms, anterograde amnesia.
## Key Drug Interactions
* **CNS Depressants (alcohol, opioids, other sedatives):** Additive CNS depression, increased risk of sedation, respiratory depression, coma, and death. Co-administration should be avoided unless necessary, with the lowest doses and shortest durations and appropriate monitoring.
* **Theophylline/Aminophylline:** May decrease the sedative effects of lorazepam.
* **Valproic acid:** May decrease lorazepam clearance and increase plasma concentrations.
## Monitoring
* Respiratory rate and depth, oxygen saturation.
* Level of consciousness and sedation.
* Signs of paradoxical reactions or agitation.
* Signs of withdrawal if discontinuing after prolonged use.
* For status epilepticus: seizure activity, vital signs, ECG.
## Clinical Pearls
* Lorazepam has a relatively intermediate half-life compared to other benzodiazepines.
* Intravenous administration can cause hypotension and respiratory depression; administer slowly.
* Paradoxical reactions are more common in children and the elderly.
* Avoid abrupt discontinuation after prolonged use due to risk of withdrawal. Tapering is recommended.
* It is not recommended for use in patients with severe depression unless co-managed with an antidepressant.
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*Disclaimer: This information is intended for healthcare professionals. Always consult the most current prescribing information and local protocols before administering any medication.*
