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# Lorazepam
## Overview
Lorazepam is a benzodiazepine with anxiolytic, sedative, hypnotic, amnestic, and anticonvulsant properties. It primarily acts by enhancing gamma-aminobutyric acid (GABA) activity.
## Primary Indications
* Anxiety disorders
* Insomnia due to anxiety or transient situational stress
* Seizure management (status epilepticus, pre-procedural sedation)
* Preoperative and pre-anesthetic medication
## Adult Dosing
* **Anxiety:** Typically 0.5 mg to 2 mg administered 2 to 3 times daily. Maximum recommended dose is 10 mg/day.
* **Insomnia:** Typically 2 mg to 4 mg administered at bedtime.
* **Preoperative/Pre-anesthetic:** Typically 2 mg to 4 mg administered IM or IV 2 hours before surgery.
* **Status Epilepticus:** Initial dose of 4 mg IV. May repeat in 5 to 10 minutes after first dose if seizure persists, up to a maximum of 8 mg. Additional doses may be given if warranted based on clinical response and patient assessment.
## Pediatric Dosing
Pediatric dosing is highly variable and depends on indication, age, and weight. It is often based on specific protocols or guidelines.
* **Status Epilepticus:** Dosing recommendations vary widely. Some sources suggest 0.05 mg/kg to 0.1 mg/kg IV over 2 to 5 minutes, not to exceed 4 mg per dose. Maximum total dose may vary.
* **Sedation:** Typically 0.02 mg/kg to 0.04 mg/kg IV, not to exceed 2 mg.
Specific pediatric dosing requires careful consideration and adherence to established guidelines.
## Dose Adjustments
* **Hepatic Impairment:** Use with caution and consider dose reduction. Lorazepam is conjugated, not metabolized by CYP enzymes, so interactions are less common, but impaired hepatic function may affect clearance.
* **Renal Impairment:** No specific dose adjustment is typically required for mild to moderate renal impairment, but caution is advised.
## Contraindications
* Hypersensitivity to lorazepam or other benzodiazepines.
* Acute narrow-angle glaucoma.
* Severe respiratory insufficiency.
* Severe hepatic insufficiency.
* Myasthenia gravis.
* Sleep apnea.
## Adverse Effects
Common adverse effects include: drowsiness, dizziness, ataxia, sedation, weakness, confusion. Less common but serious effects include: respiratory depression, paradoxical reactions (e.g., agitation, aggression), amnesia, withdrawal symptoms (especially with abrupt discontinuation after prolonged use).
## Key Drug Interactions
* **CNS Depressants (opioids, alcohol, other sedatives/hypnotics):** Additive CNS depression, potentially leading to profound sedation, respiratory depression, coma, and death. Use cautiously and consider dose reduction of one or both agents.
* **Anticonvulsants:** Lorazepam is used to treat seizures but may have complex interactions with other anticonvulsants.
## Monitoring
* Respiratory rate and oxygen saturation, especially with IV administration or in combination with other CNS depressants.
* Level of consciousness and sedation.
* Signs of dependence or withdrawal if used long-term.
* Hepatic and renal function in relevant patient populations.
## Clinical Pearls
* Intravenous administration can cause
