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## Lorazepam
### Overview
Lorazepam is a benzodiazepine with sedative, hypnotic, anxiolytic, and anticonvulsant properties. It is metabolized by glucuronidation, leading to a lower risk of drug-drug interactions compared to benzodiazepines metabolized by the cytochrome P450 system.
### Primary Indications
* Anxiety disorders
* Insomnia (short-term treatment)
* Seizure management (status epilepticus, pre-operative sedation)
* Sedation in critically ill patients
### Adult Dosing
* **Anxiety:** 0.5 mg to 2 mg orally every 6 to 8 hours. Maximum daily dose typically 10 mg.
* **Insomnia:** 2 mg to 4 mg orally at bedtime.
* **Status Epilepticus:** 4 mg intravenously (IV) or intramuscularly (IM) administered slowly. May repeat after 10-15 minutes if needed, up to a maximum of 8 mg in a 12-hour period.
* **Pre-operative Sedation:** 2 mg to 4 mg IM administered 2 hours before surgery.
* **Sedation (Critical Care):** Titrated to desired effect, commonly starting at 0.05 mg/kg/hour IV infusion, but doses vary widely based on patient status and goal. Titration is crucial.
### Pediatric Dosing
* **Anxiety:** Generally not recommended for routine use in children due to lack of established efficacy and safety data. If used, doses are highly individualized and often start at the lower end of adult ranges.
* **Status Epilepticus:** 0.1 mg/kg IV/IM, maximum 4 mg per dose. May repeat once after 5-10 minutes if seizure persists.
* **Sedation:** Dosing is highly variable and should be guided by specialist protocols.
### Dose Adjustments
* **Hepatic Impairment:** Use with caution; dose reduction may be necessary.
* **Renal Impairment:** No specific dose adjustment is typically required, but monitor for accumulation and increased adverse effects.
* **Elderly:** Initiate at lower doses (e.g., 0.5 mg twice daily) due to increased sensitivity to CNS effects and risk of falls.
### Contraindications
* Known hypersensitivity to lorazepam or other benzodiazepines.
* Acute narrow-angle glaucoma.
* Severe respiratory insufficiency.
* Severe hepatic insufficiency.
* Sleep apnea.
### Adverse Effects
* **Common:** Sedation, drowsiness, dizziness, weakness, ataxia, confusion.
* **Less Common:** Paradoxical excitation, amnesia, respiratory depression (especially with IV administration or in combination with other CNS depressants), hypotension, impaired coordination.
* **Serious:** Respiratory depression, dependence, withdrawal symptoms upon abrupt discontinuation.
### Key Drug Interactions
* **CNS Depressants (e.g., opioids, alcohol, other sedatives, antihistamines):** Additive CNS depression, increasing risk of sedation, respiratory depression, and death. Use with extreme caution and consider dose reduction of one or both agents.
* **Theophylline and Aminophylline:** May reduce the sedative effects of lorazepam.
### Monitoring
* Level of sedation and consciousness.
* Respiratory rate and oxygen saturation.
* Blood pressure.
* Signs of withdrawal if discontinuing therapy.
* Hepatic and renal function, particularly in patients with impaired organ function or prolonged use.
### Clinical Pearls
* Lorazepam has a relatively rapid onset of action, particularly with IV/IM administration.
* IV lorazepam should be administered slowly to minimize respiratory depression and hypotension.
* Avoid abrupt discontinuation due to risk of withdrawal symptoms, including rebound insomnia, anxiety, and seizures. Taper slowly under medical supervision.
* Due to its favorable safety profile regarding CYP450 interactions, it is often preferred in patients on multiple medications metabolized by this system.
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*Disclaimer: This information is intended for healthcare professionals. Always consult the official prescribing information and relevant guidelines for complete and up-to-date drug information, including specific indications, contraindications, warnings, precautions, and adverse reactions, before making any clinical decisions.*
