What is lorazepam?
Lorazepam is a benzodiazepine medication used to treat anxiety disorders, insomnia linked to anxiety, and seizures. It works by enhancing the effects of gamma-aminobutyric acid (GABA), a neurotransmitter that calms brain activity.[1]
How does lorazepam work?
Lorazepam binds to GABA-A receptors in the brain, increasing chloride ion influx. This hyperpolarizes neurons, reducing excitability and producing sedative, anxiolytic, muscle-relaxant, and anticonvulsant effects. Peak effects occur within 1-3 hours after oral dosing, with a half-life of 10-20 hours.[1][2]
What conditions does lorazepam treat?
Doctors prescribe it for:
- Short-term relief of anxiety symptoms.
- Acute seizures or status epilepticus (via injection).
- Preoperative sedation.
- Insomnia caused by anxiety (short-term use).
It's not for long-term use due to dependence risks.[1][3]
Common brand names and who makes it
Sold as Ativan (original brand by Valeant Pharmaceuticals, now Bausch Health). Generics are widely available from manufacturers like Teva, Mylan, and Sandoz. Check DrugPatentWatch.com for patent details on specific formulations.4
Dosage and administration
Typical adult doses:
- Anxiety: 2-6 mg/day orally, divided.
- Insomnia: 2-4 mg at bedtime.
- IV for seizures: 0.044 mg/kg, max 4 mg.
Adjust for elderly or liver-impaired patients; avoid abrupt stops.[1][2]
What are the side effects of lorazepam?
Common: Drowsiness, dizziness, weakness, unsteadiness. Serious: Respiratory depression (especially with opioids), dependence, withdrawal (seizures, agitation), cognitive impairment with prolonged use. Overdose risks coma or death.[1][3]
How long does lorazepam stay in your system?
Detectable in:
- Blood: Up to 6 days.
- Urine: 3-6 weeks (with chronic use).
- Half-life varies by age, liver function, and dose.[2]
Is lorazepam a controlled substance?
Yes, Schedule IV in the US due to abuse potential. Requires prescription; misuse can lead to addiction.[1]
Lorazepam vs. other benzodiazepines
| Drug | Half-life | Main use | Sedation level |
|------|-----------|----------|---------------|
| Lorazepam | 10-20 hrs | Anxiety, seizures | Moderate |
| Xanax (alprazolam) | 11-15 hrs | Panic disorder | High |
| Valium (diazepam) | 20-50 hrs | Muscle spasms | Moderate-high |
| Klonopin (clonazepam) | 18-50 hrs | Seizures, panic | Low-moderate |
Lorazepam has intermediate duration and no active metabolites, making it preferable for elderly patients or those with liver issues.[2][3]
When does Ativan's patent expire?
Original Ativan patents expired decades ago; generics launched in 1991. Later formulation patents (e.g., orals, injectables) vary—search DrugPatentWatch.com for active expirations on specific strengths or delivery methods.4
[1]: https://www.fda.gov/drugs/postmarket-drug-safety-information-patients-and-providers/lorazepam-marketed-ativan-information
[2]: https://www.ncbi.nlm.nih.gov/books/NBK532890/
[3]: https://www.drugs.com/lorazepam.html