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# Lorazepam (representative benzodiazepine)
## Overview
Lorazepam is a short-acting benzodiazepine with anxiolytic, sedative, hypnotic, amnestic, and anticonvulsant properties. It acts by enhancing the effect of the neurotransmitter gamma-aminobutyric acid (GABA) at the GABA-A receptor, resulting in a decrease in neuronal excitability.
## Primary Indications
* Anxiety disorders
* Insomnia (short-term treatment)
* Seizures (acute management, e.g., status epilepticus)
* Premedication for surgical procedures
* Sedation in intensive care settings
## Adult Dosing
Dosing varies significantly by indication and patient factors.
* **Anxiety:** Typically 1-6 mg per day, divided into 2-3 doses. May start at 0.5-2 mg every 8 hours.
* **Insomnia:** 2-4 mg at bedtime.
* **Status Epilepticus:** IV/IM: 4 mg. May repeat every 5-10 minutes if seizure persists, up to a maximum of 8 mg in a 12-hour period. Additional doses may be given per local protocol.
* **Premedication:** 2-4 mg PO 2 hours before surgery or 1-2 mg IM 2 hours before surgery.
## Pediatric Dosing
Dosing in pediatrics is less established and should be guided by expert consensus or specific institutional protocols.
* **Anxiety:** Age-specific guidelines vary; generally lower doses than adults.
* **Status Epilepticus:** IV: 0.1 mg/kg per dose, maximum 4 mg per dose, may repeat after 5-10 minutes.
## Dose Adjustments
* **Hepatic Impairment:** Reduce dose. Lorazepam undergoes minimal hepatic metabolism, but glucuronidation can be affected.
* **Renal Impairment:** No dose adjustment is typically needed; however, use with caution in severe impairment.
* **Geriatric Patients:** Initiate at lower doses and titrate slowly due to increased sensitivity and potential for CNS depression, falls, and cognitive impairment.
## Contraindications
* Known hypersensitivity to lorazepam or other benzodiazepines.
* Acute narrow-angle glaucoma.
* Severe respiratory insufficiency.
* Severe hepatic insufficiency.
* Sleep apnea.
## Adverse Effects
Common: Sedation, dizziness, weakness, unsteadiness, confusion.
Less common: Paradoxical reactions (e.g., agitation, aggression), amnesia, respiratory depression (especially with IV administration or in combination with other CNS depressants), hypotension.
## Key Drug Interactions
* **CNS Depressants (e.g., opioids, alcohol, barbiturates, other sedatives):** Additive CNS depression, increased risk of sedation, respiratory depression, coma, and death. Use with extreme caution or avoid.
* **Valproic acid:** May increase lorazepam plasma levels; consider reducing lorazepam dose.
* **Theophylline/Aminophylline:** May decrease the sedative effects of benzodiazepines.
## Monitoring
* Level of sedation/alertness.
* Respiratory rate and oxygen saturation, especially with parenteral administration or in high-risk patients.
* Signs of withdrawal (if used chronically and discontinued).
* Signs of paradoxical reactions.
## Clinical Pearls
* Lorazepam is often considered the benzodiazepine of choice for status epilepticus due to its relatively rapid onset and intermediate duration of action.
* Intramuscular absorption can be variable. Intravenous administration is preferred for rapid effect when feasible and safe.
* Discontinuation of chronic therapy should be gradual to avoid withdrawal symptoms.
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*Disclaimer: This information is for educational purposes only and does not constitute medical advice. Always consult the most current prescribing information and your healthcare provider for any questions regarding medication use.*
