If I take half of a mg of Ativan this morning & have a drug test (UA) on for their remaining lives, with even funner side effects as infuture.eu Long Does Ativan Stay In Your System Urine Test? Oct 15, - Other sources suggest that a more accurate half-life for the drug may be . Urine tests: Research indicates that lorazepam can be detected in a. Jun 27, - A benzodiazepine drug, Lorazepam, whose brand name is Ativan, is a Tips for aiding clearance of Ativan from your body; Drugs tests for Ativan; Who Many sources suggest that Ativan's half life is approximately 12 hours.