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## Lorazepam
### Overview
Lorazepam is a short-acting benzodiazepine with anxiolytic, sedative, hypnotic, amnestic, and anticonvulsant properties.
### Primary Indications
* Anxiety disorders
* Insomnia
* Status epilepticus
* Preoperative sedation
* Management of alcohol withdrawal symptoms
### Adult Dosing
* **Anxiety:** 1-4 mg orally every 6-8 hours. Maximum: 10 mg/day.
* **Insomnia due to anxiety:** 2-4 mg orally at bedtime.
* **Status Epilepticus:** 4 mg IV or IM. May repeat in 5-10 minutes if needed. Maximum: 8 mg per dose.
* **Preoperative Sedation:** 2-4 mg IM given 2 hours before surgery.
* **Alcohol Withdrawal:** 1-4 mg orally or IV/IM every 4-6 hours as needed. Dosing should be guided by withdrawal severity and patient response.
### Pediatric Dosing
Dosing in pediatric patients is highly variable and should be based on weight, age, and clinical indication. There is limited established pediatric dosing. Consultation with a pediatric specialist is recommended.
* **Status Epilepticus (IV):** 0.05-0.1 mg/kg/dose, maximum 4 mg/dose. Repeat every 5-10 minutes if needed. (Source: Harriet Lane)
* **Sedation/Anxiolysis (Oral/IM):** 0.02-0.05 mg/kg/dose every 6-8 hours.
### Dose Adjustments
* **Hepatic Impairment:** Use with caution; may require reduced dosage.
* **Renal Impairment:** No specific adjustment is typically required, but monitor for prolonged effects.
* **Elderly:** Start with lower doses (e.g., 0.5-1 mg orally BID) due to increased sensitivity and risk of adverse effects.
### Contraindications
* Known hypersensitivity to benzodiazepines or their components.
* Acute angle-closure glaucoma.
* Severe respiratory insufficiency.
* Severe hepatic insufficiency.
* Sleep apnea.
### Adverse Effects
Common: Drowsiness, dizziness, sedation, unsteadiness, weakness, confusion.
Serious: Respiratory depression, paradoxical reactions (agitation, hostility), amnesia, dependence, withdrawal symptoms.
### Key Drug Interactions
* **CNS Depressants (opioids, alcohol, other sedatives):** Additive CNS depression, increasing risk of sedation, respiratory depression, coma, and death.
* **Theophylline/Aminophylline:** May reduce the sedative effects of lorazepam.
* **Valproic acid:** May increase lorazepam levels.
### Monitoring
* Level of consciousness and sedation.
* Respiratory rate and oxygen saturation.
* Signs of withdrawal upon discontinuation.
* Potential for abuse and dependence.
### Clinical Pearls
* Lorazepam can be administered orally, IM, or IV. IV administration offers faster onset but carries a higher risk of respiratory depression.
* IM absorption can be unpredictable.
* Avoid abrupt discontinuation to prevent withdrawal symptoms. Tapering is recommended.
* Due to its intermediate half-life, it is less likely to cause significant morning drowsiness compared to longer-acting benzodiazepines.
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**Disclaimer:** This information is intended for clinical use and is not a substitute for professional medical judgment. Always consult the most current prescribing information and institutional protocols before administering any medication. Dosing may vary based on individual patient factors and local guidelines.
