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# Lorazepam
## Overview
Lorazepam is a short-acting benzodiazepine with anxiolytic, sedative, hypnotic, amnestic, anticonvulsant, and muscle relaxant properties. It acts by potentiating the effects of gamma-aminobutyric acid (GABA) at the GABA-A receptor.
## Primary Indications
* Anxiety disorders
* Insomnia
* Status epilepticus (adjunct)
* Preoperative sedation
* Management of agitation
## Adult Dosing
* **Anxiety:** 1-4 mg PO/IM/IV every 6-8 hours. Maximum generally not to exceed 10 mg/day.
* **Insomnia:** 2-4 mg PO at bedtime.
* **Preoperative Sedation:** 2-4 mg IM given 2 hours before surgery.
* **Status Epilepticus:** 4 mg IV administered slowly. Additional 2 mg IV can be given every 5 minutes as needed, not to exceed 8 mg total. (Dosing may vary based on institutional protocol).
* **Agitation:** 1-4 mg PO/IM/IV. May repeat every 10-15 minutes as needed. Maximum generally not to exceed 4 mg per dose or 10 mg/day.
## Pediatric Dosing
Dosing is highly variable and requires careful consideration of age, weight, and indication. Consult specific pediatric guidelines or institutional protocols.
* **Status Epilepticus:** 0.05-0.1 mg/kg/dose IV/IM, maximum 4 mg/dose. May repeat every 5-10 minutes as needed, not to exceed 0.1 mg/kg or 8 mg total in 12 hours. (Consult specific pediatric emergency protocols).
* **Sedation/Anxiety:** Doses vary significantly by indication and setting.
## Dose Adjustments
* **Hepatic Impairment:** Use with caution, may require dose reduction.
* **Renal Impairment:** Use with caution, may require dose reduction.
* **Elderly:** Initiate at lower doses (e.g., 0.5-2 mg PO/IM/IV per dose) and titrate slowly due to increased sensitivity and risk of side effects.
## Contraindications
* Known hypersensitivity to lorazepam or other benzodiazepines.
* Acute narrow-angle glaucoma.
* Severe respiratory insufficiency.
* Severe hepatic insufficiency.
* Myasthenia gravis.
* Acute intoxication with alcohol, opioids, or other CNS depressants.
## Adverse Effects
* **Common:** Sedation, dizziness, weakness, ataxia, confusion.
* **Less Common:** Hypotension, respiratory depression, anterograde amnesia, paradoxical excitation, dysarthria.
* **Rare:** Blood dyscrasias, hepatitis, jaundice.
## Key Drug Interactions
* **CNS Depressants (e.g., alcohol, opioids, antihistamines, other sedatives):** Additive CNS depression, potentiating sedation and respiratory depression.
* **CYP450 Inhibitors/Inducers:** Lorazepam is not extensively metabolized by CYP450 enzymes, so interactions are less common than with other benzodiazepines. However, potential exists.
* **Valproic acid:** May decrease lorazepam clearance and increase plasma concentrations.
## Monitoring
* Level of sedation and respiratory status, especially with IV administration or in combination with other CNS depressants.
* Signs of paradoxical reactions or worsening agitation.
* Signs of dependence and withdrawal symptoms upon discontinuation.
## Clinical Pearls
* Intramuscular (IM) absorption can be variable and slower than intravenous (IV) or oral (PO).
* For IV administration, give slowly to avoid respiratory depression and hypotension.
* Avoid abrupt discontinuation; taper gradually to prevent withdrawal symptoms.
* Use the lowest effective dose for the shortest duration necessary.
* Consider the potential for anterograde amnesia when using for procedures or in situations requiring recall.
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*This information is intended for healthcare professionals and does not replace comprehensive drug information resources or clinical judgment. Always verify current prescribing information with the most recent product labeling and relevant clinical guidelines.*
