Olympic Drugs Testing Procedures Drug Abuse And Young Adults If you suddenly stop use of Ativan after only 7 days of use, it is possible for you to rebound back and have more severe anxiety or insomnia than when you started. Patients taking Ativan will experience results within about one week of starting to take it. http://www.lorazepamsales.com/ - lorazepam without rx Ativan and Anxiety: Patients taking Ativan will experience results within about one week of starting to take it.