Ativan (Lorazepam) belongs to the class benzodiazepines. Its traces can be detected in a body for up to a month. Learn about how long it stays in your system. Understand Ativan’s half-life, elimination process, and detection times for common drug tests, including urine, blood, and saliva screenings. This ativan half life calculator shows how ativan accumulates and how long it stays in your body. Get dose and frequency with ease! Learn what the half-life of Ativan is, how long it stays in your system, and factors affecting drug metabolism. Expert guidance on safe use and withdrawal. Ativan, also known as lorazepam, can remain in your system for varying durations depending on the type of test conducted. Typically, it can be detected in urine for up to six days and in your blood for up to three days. Understanding how long Ativan stays in your system is important, especially if you're combining it with other substances or need to undergo a drug test. Comparison of Benzodiazepine Pharmacology. *Half-life is the time it takes for your body to metabolize half of the drug, and includes active metabolites (e.g., oxazepam is a metabolite of diazepam). ** Comparative Oral Dose: Since there is no standard, equivalencies vary between the sources. Includes LORazepam indications, dosage/administration, pharmacology, mechanism/onset/duration of action, half-life, dosage forms, interactions, warnings, adverse reactions, off-label uses and more. Ativan’s effects typically last 6–8 hours, but it stays in your system much longer. Learn how age, liver health, and other factors affect how long it lasts. The half-life of Ativan (lorazepam) is 10 to 20 hours, with an average of about 12 hours in healthy adults. That means it takes roughly 12 hours for your body to eliminate half of a single dose from your bloodstream. Full elimination of the drug takes considerably longer, typically 2 to 3 days after your last dose. Half-Life of Ativan (Lorazepam) The elimination half-life of lorazepam is approximately 12 hours in adults, with a range of 8-25 hours depending on individual patient factors. 1.