Is .25 mg of ativan effective, is 0.25 mg lorazepam effective is .25 mg of ativan effective ==> is .25 mg of ativan effective is .25 mg of ativan effective is 0.25 mg lorazepam effective is 0.5 mg ativan effective is .5 mg ativan effective how long does .25 ativan last is .25 mg of lorazepam effective is 0.25 mg of ativan effective