"i&#039;ve been on ativan for 4 months now: 0.5mg once or twice a day to control my anxiety attacks. i only take if when i feel jittery, flushing in my face, a heavy headache akin to tension headache and dizziness. usually these symptoms subside within 1 to 2 hours of dosing. sometimes as quickly as half an hour and it is not often that i have to take 1mg in two divided (0.5mg) 6-hourly doses. last month, i didn&#039;t take ativan for 5 straight days and i didn&#039;t suffer any withdrawal symptoms or rebounds."