How long does it take for Ativan to work?
The amount of time it takes for Ativan (lorazepam) to work depends on the formulation you are taking. For the oral tablets and liquid, it starts to work within 30 minutes. The intravenous (IV) formulation takes about 1-3 minutes to work, and the intramuscular version takes 15-30 minutes to start working.
Do not take more Ativan if you feel like it is not working for you. Keep in mind that it can take hours to notice the full effects. Speak to your healthcare provider if you are concerned with how well Ativan is working.
References
Ghiasi, N., et. al. 2024. Lorazepam. In: StatPearls [Internet]. Accessed July 26, 2024 at https://www.ncbi.nlm.nih.gov/books/NBK532890/
National Health Service. Updated February 2023. About lorazepam. Accessed July 26, 2024 at https://www.nhs.uk/medicines/lorazepam/about-lorazepam/
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Drug information
- Ativan Information for Consumers
- Ativan prescribing info & package insert (for Health Professionals)
- Side Effects of Ativan (detailed)