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# Lorazepam
## Overview
Lorazepam is a benzodiazepine with anxiolytic, sedative, hypnotic, amnestic, anticonvulsant, and muscle relaxant properties. It acts by potentiating the effect of the neurotransmitter gamma-aminobutyric acid (GABA) at the GABA_A receptor.
## Primary Indications
* Anxiety disorders
* Insomnia
* Seizures (including status epilepticus)
* Preoperative sedation
* Management of agitation
## Adult Dosing
* **Anxiety:** 0.5 mg to 2 mg orally 2 to 3 times daily. Maximum dose typically 10 mg daily.
* **Insomnia:** 1 mg to 2 mg orally at bedtime.
* **Status Epilepticus:** 4 mg intravenously or intramuscularly. Repeat in 5 to 10 minutes if necessary. Maximum dose typically 8 mg in a 24-hour period, but higher doses may be used under strict medical supervision.
* **Preoperative Sedation:** 2 mg to 4 mg intramuscularly 2 hours before surgery.
* **Agitation:** 0.5 mg to 2 mg orally, intramuscularly, or intravenously. Dosing should be titrated to effect.
## Pediatric Dosing
Dosing in pediatric patients is highly variable and depends on the indication, age, and weight. **Consult specific pediatric guidelines or expert recommendations.**
* **Anxiety/Sedation:** Oral doses of 0.02 mg/kg to 0.05 mg/kg per dose have been used.
* **Status Epilepticus:** Intravenous doses of 0.1 mg/kg per dose have been used. Maximum single dose typically 4 mg.
## Dose Adjustments
* **Hepatic Impairment:** Use with caution; dose reduction may be necessary.
* **Renal Impairment:** Use with caution; dose reduction may be necessary.
* **Elderly:** Initiate with lower doses and titrate cautiously due to increased sensitivity and risk of side effects (e.g., falls, confusion, sedation).
## Contraindications
* Known hypersensitivity to lorazepam or other benzodiazepines.
* Acute narrow-angle glaucoma.
* Severe respiratory insufficiency.
* Severe hepatic insufficiency.
* Sleep apnea syndrome.
## Adverse Effects
Common: Drowsiness, dizziness, weakness, ataxia, sedation, confusion.
Less common: Paradoxical excitation, anterograde amnesia, respiratory depression (especially with IV administration or in combination with other CNS depressants), hypotension.
## Key Drug Interactions
* **Central Nervous System (CNS) Depressants (e.g., opioids, alcohol, sedatives, other benzodiazepines, barbiturates):** Increased risk of profound sedation, respiratory depression, coma, and death.
* **Valproic Acid:** May increase lorazepam plasma concentrations and prolong its half-life.
* **Theophylline/Aminophylline:** May antagonize the sedative effects of benzodiazepines.
## Monitoring
* Level of sedation and consciousness.
* Respiratory rate and oxygen saturation, particularly with IV administration or in combination with other CNS depressants.
* Signs of paradoxical reactions.
* Signs of dependence or withdrawal symptoms upon discontinuation.
## Clinical Pearls
* Intravenous lorazepam can cause phlebitis; it should be administered slowly and may be diluted in an equal volume of sterile water for injection, saline, or 0.5% lidocaine if needed.
* Avoid abrupt discontinuation due to the risk of withdrawal symptoms, which can include rebound insomnia, anxiety, tremors, and in severe cases, seizures. Tapering of the dose is recommended.
* Lorazepam's onset of action is rapid for IV/IM routes and slower for oral administration.
* The clinical effect may be delayed in patients with significant hepatic impairment.
***
*Always consult the most current prescribing information and relevant institutional protocols before administering any medication.*
