Please check your internet connection and try again.
## Lorazepam
### Overview
Lorazepam is a benzodiazepine medication with anxiolytic, sedative, hypnotic, and anticonvulsant properties. It acts by enhancing the effect of the neurotransmitter gamma-aminobutyric acid (GABA).
### Primary Indications
* Anxiety disorders
* Insomnia (short-term treatment)
* Seizure management (including status epilepticus)
* Premedication for surgical procedures
* Management of acute agitation
### Adult Dosing
* **Anxiety:** 0.5 mg to 2 mg orally every 6 to 8 hours as needed. Maximum daily dose is typically 10 mg.
* **Insomnia:** 2 mg to 4 mg orally at bedtime.
* **Status Epilepticus:** 4 mg intravenously (IV) or intramuscularly (IM). May repeat in 5 to 10 minutes if needed, not to exceed 8 mg in a 12-hour period.
* **Premedication:** 1 mg to 4 mg orally or IV 1 to 2 hours before surgery.
* **Agitation:** 0.5 mg to 2 mg IV or IM. Dosing should be individualized based on response and clinical judgment.
### Pediatric Dosing
* **Anxiety:** Dosing is not well established and should be individualized. Some sources suggest 0.02 mg/kg/dose orally or IV every 4 to 8 hours, not to exceed adult doses.
* **Status Epilepticus:** 0.1 mg/kg IV over 2 to 5 minutes, not to exceed 4 mg per dose. May repeat once after 5 to 10 minutes if seizures persist.
### Dose Adjustments
* **Hepatic Impairment:** Use with caution. Reduced dosage may be necessary.
* **Renal Impairment:** No specific dose adjustment is usually recommended, but caution is advised, especially in severe impairment.
* **Elderly:** Initiate with lower doses (e.g., 0.5 mg orally twice daily) due to increased sensitivity and risk of sedation and falls.
### Contraindications
* Known hypersensitivity to lorazepam or other benzodiazepines.
* Acute narrow-angle glaucoma.
* Severe respiratory insufficiency.
* Severe hepatic insufficiency.
* Myasthenia gravis.
### Adverse Effects
Common: Sedation, drowsiness, dizziness, weakness, unsteadiness.
Less common: Confusion, depression, amnesia, respiratory depression (especially with IV administration or in combination with other CNS depressants), paradoxical excitement.
### Key Drug Interactions
* **CNS Depressants (opioids, alcohol, other sedatives):** Enhanced CNS depression, respiratory depression, and sedation. Exercise extreme caution.
* **CYP450 Inhibitors/Inducers:** Lorazepam is primarily metabolized by glucuronidation, so interactions with CYP450 enzymes are less significant compared to other benzodiazepines. However, some medications may affect its metabolism or clearance.
### Monitoring
* Monitor for sedation, respiratory rate, blood pressure, and level of consciousness, especially with IV administration.
* Assess for therapeutic response (e.g., reduction in anxiety, cessation of seizures).
* Monitor for signs of withdrawal if abruptly discontinued after prolonged use.
### Clinical Pearls
* Intramuscular (IM) absorption can be slower and more variable than IV.
* Avoid abrupt discontinuation, especially after chronic use, due to potential for withdrawal symptoms (anxiety, insomnia, seizures). Taper gradually.
* Use in elderly patients requires caution due to increased risk of adverse effects.
* For IV administration, dilute with an equal volume of compatible solution (e.g., sterile water for injection, sodium chloride 0.9%) if needed and administer slowly to minimize adverse effects.
**Disclaimer:** This information is intended for clinical use and does not replace professional judgment. Always consult the most current prescribing information and relevant guidelines for complete details and to verify dosage and safety information before prescribing.
