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# Lorazepam
## Overview
Lorazepam is a benzodiazepine with sedative, hypnotic, anxiolytic, anticonvulsant, and muscle relaxant properties. It acts by enhancing the effect of the neurotransmitter gamma-aminobutyric acid (GABA) at the GABAA receptor.
## Primary Indications
* Anxiety disorders
* Insomnia (short-term treatment)
* Status epilepticus
* Preanesthetic medication
## Adult Dosing
* **Anxiety:** 0.5 mg to 2 mg orally every 6 to 8 hours as needed. May increase dose based on response.
* **Insomnia:** 2 mg to 4 mg orally at bedtime.
* **Status Epilepticus:** 4 mg administered intravenously or intramuscularly. May repeat dose after 5 to 10 minutes if seizure persists. A maximum of 8 mg should be administered within a 12-hour period.
* **Preanesthetic Medication:** 2 mg to 4 mg intramuscularly or intravenously 2 hours before surgery.
Intravenous administration is generally preferred for status epilepticus due to faster onset.
## Pediatric Dosing
Dosing in pediatric patients is less established and requires careful consideration due to potential for paradoxical reactions and respiratory depression.
* **Status Epilepticus:** 0.05 mg/kg to 0.1 mg/kg intravenously, not to exceed 4 mg per dose. May be repeated once after 5 to 10 minutes if needed.
* **Anxiety/Sedation:** Dosing is highly individualized and should be based on patient weight and clinical response, typically starting at the lower end of adult ranges if used at all.
## Dose Adjustments
* **Hepatic Impairment:** Use with caution; dose reduction may be necessary.
* **Renal Impairment:** No specific dose adjustment is recommended, but caution is advised.
* **Elderly:** Start at the lower end of the adult dose range (e.g., 0.5 mg orally twice daily) and titrate slowly due to increased sensitivity to CNS effects.
## Contraindications
* Known hypersensitivity to lorazepam or other benzodiazepines.
* Acute narrow-angle glaucoma.
* Severe respiratory insufficiency.
* Severe hepatic insufficiency (particularly for IV administration).
## Adverse Effects
Common adverse effects include drowsiness, dizziness, weakness, ataxia, and confusion. Less common but serious effects include respiratory depression, paradoxical excitation, and amnesia.
## Key Drug Interactions
* **CNS Depressants (e.g., opioids, alcohol, other sedatives):** Additive CNS depression, increased risk of respiratory depression and sedation. Concurrent use of opioids with benzodiazepines can lead to severe sedation, respiratory depression, coma, and death.
* **Theophylline/Aminophylline:** May antagonize the sedative effects of lorazepam.
* **Valproic acid:** May decrease lorazepam clearance and increase plasma concentrations.
## Monitoring
* Respiratory rate, oxygen saturation, and level of consciousness.
* Blood pressure and heart rate, especially with intravenous administration.
* Signs of paradoxical reactions (e.g., agitation, aggression).
* Signs of withdrawal symptoms if discontinued abruptly after prolonged use.
## Clinical Pearls
* Lorazepam has a relatively long half-life and accumulation can occur with repeated dosing.
* Avoid abrupt discontinuation after prolonged use to prevent withdrawal symptoms. Tapering is recommended.
* For intravenous administration, dilute with an equal volume of sterile water for injection, 0.9% sodium chloride, or 5% dextrose for injection, and administer slowly to minimize risk of respiratory depression and hypotension.
* Intramuscular lorazepam is absorbed erratically and slowly; do not use for emergency situations where rapid effect is needed.
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*This information is intended for healthcare professionals. Always consult the official prescribing information and relevant clinical guidelines for complete details and to confirm current recommendations. Dosing may vary based on individual patient factors and local protocols.*
