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# Lorazepam
## Overview
Lorazepam is a benzodiazepine with anxiolytic, sedative, hypnotic, anticonvulsant, and muscle relaxant properties. It is metabolized by glucuronidation and has an intermediate half-life.
## Primary Indications
* Management of anxiety disorders
* Short-term relief of the symptoms of anxiety or anxiety associated with depressive symptoms
* Insomnia, characterized by difficulty falling or staying asleep, or early awakening
* Premedication for surgical procedures to induce sedation and anxiolysis
* Management of status epilepticus and seizure disorders
## Adult Dosing
* **Anxiety Disorders:** 1-3 mg orally or IM every 8-12 hours. Maximum oral dose: 10 mg/day.
* **Insomnia:** 2-4 mg orally at bedtime.
* **Premedication:**
* Oral: 2-4 mg 1-2 hours before surgery.
* IM: 0.05 mg/kg (max 4 mg) 2 hours before surgery.
* IV: 0.05 mg/kg (max 4 mg) 15-20 minutes before surgery.
* **Status Epilepticus:** 2-4 mg IV/IM, may repeat in 5-10 minutes to a maximum of 8 mg.
Dosing should be individualized and the lowest effective dose used, especially in elderly or debilitated patients.
## Pediatric Dosing
Dosing in children is not well-established and should be individualized.
* **Status Epilepticus:** 0.05-0.1 mg/kg IV/IM every 5-10 minutes, max 4 mg/dose, every 15-30 minutes if needed.
## Dose Adjustments
* **Hepatic Impairment:** Use with caution, dose reduction may be necessary.
* **Renal Impairment:** No specific dose adjustment, but monitor for accumulation.
* **Elderly/Debilitated Patients:** Start with lower doses (e.g., 0.5-1 mg BID) and titrate cautiously.
## Contraindications
* Hypersensitivity to lorazepam, other benzodiazepines, or any component of the formulation.
* Acute narrow-angle glaucoma.
* Severe respiratory insufficiency.
* Severe hepatic insufficiency.
* Sleep apnea syndrome.
## Adverse Effects
Common: Drowsiness, dizziness, sedation, unsteadiness, weakness, confusion.
Less Common: Paradoxical excitement, depression, amnesia, ataxia, blurred vision, hypotension, respiratory depression.
Long-term use can lead to physical and psychological dependence.
## Key Drug Interactions
* **CNS Depressants (e.g., opioids, alcohol, other sedatives):** Increased risk of profound sedation, respiratory depression, coma, and death. Co-administration should be avoided or used with extreme caution and lowest effective doses.
* **CYP450 Inhibitors/Inducers:** Lorazepam is primarily metabolized by glucuronidation, not CYP450 enzymes, so interactions via this pathway are less common. However, drugs that affect glucuronidation could potentially alter clearance.
## Monitoring
* Mental status, level of sedation, and respiratory rate.
* Signs of dependence and withdrawal, especially with prolonged use.
* Liver and renal function tests, particularly in patients with pre-existing organ dysfunction.
## Clinical Pearls
* Short-term use is recommended due to the potential for tolerance, dependence, and withdrawal symptoms.
* Abrupt discontinuation can lead to withdrawal symptoms, including rebound insomnia, anxiety, agitation, and in severe cases, seizures. Tapering is essential.
* IV lorazepam can cause phlebitis or local irritation. Administer slowly.
* Avoid use in pregnancy unless the potential benefit justifies the potential risk to the fetus.
* Lorazepam is not recommended for the treatment of chronic psychosis.
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*This information is intended for healthcare professionals. Always consult the current prescribing information and relevant guidelines for complete details and to verify dosage and safety information before administering this medication.*
