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## Lorazepam
**Overview:** Lorazepam is a benzodiazepine with anxiolytic, sedative, hypnotic, and anticonvulsant properties. It is primarily metabolized by glucuronidation, leading to a lower risk of drug interactions compared to other benzodiazepines.
**Primary Indications:**
* Management of anxiety disorders
* Short-term treatment of insomnia
* Sedation (pre-procedural or ICU)
* Status epilepticus and seizure management
**Adult Dosing:**
* **Anxiety:** 1 mg to 2 mg orally every 6 to 8 hours as needed. Doses up to 4 mg orally every 6 to 8 hours may be required for severe anxiety.
* **Insomnia:** 2 mg to 4 mg orally at bedtime.
* **Pre-procedural Sedation:** 2 mg to 4 mg intramuscularly or intravenously 2 hours before surgery.
* **ICU Sedation:** Continuous intravenous infusion: 0.02 mg/kg/hour (initial bolus may be given). Titrate to desired level of sedation. Typical infusion rates range from 0.1 mg/kg/hour up to 10 mg/hour.
* **Status Epilepticus:** 4 mg intravenously, repeated after 5 to 10 minutes if seizures persist, not to exceed 8 mg total in a 12-hour period.
**Pediatric Dosing:**
* **Anxiety:** Dosing varies widely and is not well-established. Typically 0.02 mg/kg to 0.05 mg/kg orally every 6 to 8 hours. Maximum dose typically 4 mg per dose.
* **Pre-procedural Sedation:** 0.02 mg/kg to 0.05 mg/kg orally or intramuscularly, not to exceed 4 mg.
* **Status Epilepticus:** 0.1 mg/kg intravenously, not to exceed 4 mg per dose. May be repeated once after 10-15 minutes.
* **ICU Sedation:** Similar to adults, typically starting at 0.02 mg/kg/hour intravenously, titrating as needed.
**Dose Adjustments:**
* **Hepatic Impairment:** Use with caution. Reduced doses may be necessary.
* **Renal Impairment:** No specific dose adjustments are usually required due to glucuronidation, but caution is advised in severe impairment.
* **Elderly:** Initiate with lower doses (e.g., 0.5 mg to 1 mg orally twice daily) and titrate cautiously 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.
* Sleep apnea syndrome.
**Adverse Effects:** Sedation, dizziness, weakness, unsteadiness, amnesia, confusion, ataxia, drowsiness. Respiratory depression can occur, especially with IV administration or in combination with other CNS depressants. Paradoxical reactions (e.g., excitement, aggression) are rare.
**Key Drug Interactions:**
* **CNS Depressants (opioids, alcohol, other sedatives):** Additive CNS depression, potentially leading to severe sedation, respiratory depression, coma, and death.
* **Theophylline/Aminophylline:** May reduce the sedative effects of lorazepam.
**Monitoring:**
* Level of sedation and respiratory status, especially with parenteral administration or in the ICU.
* Signs of dependence and withdrawal with long-term use.
* Cognitive function and balance in elderly patients.
**Clinical Pearls:**
* Lorazepam is often the benzodiazepine of choice for intravenous administration in status epilepticus due to its relatively rapid onset and intermediate half-life.
* It is available in oral, sublingual, intramuscular, and intravenous formulations.
* Tolerance and dependence can develop with prolonged use. Abrupt discontinuation can lead to withdrawal symptoms.
* Caution should be exercised when driving or operating heavy machinery.
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*Please verify the current prescribing information for complete details and any updates before making clinical decisions.*
