How long does .5 mg of ativan last in your system?

Answer 1

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The half life of lorazepam is 10 - 20 hours according to Professor Heather Ashton's Benzodiazepine Equivalence and Half Life Table. See here http://www.bcnc.org.uk/equivalence.html
So basically half of it is gone within 10 - 20 hours. After a day or 2 or max 3 days you shouldn't be feeling the effects. However if you have been using ativan or any other sedative hypnotic type drug (tranquillisers and sleeping pills) longer that a few weeks or months you may experience benzodiazepine withdrawal symptoms which can drag on for months after stopping taking a benzodiazepine like ativan. See this page http://www.bcnc.org.uk/symptoms.html
Hope this answers your question.

Answer 2

According to my drug book its 8-12 hours.

Answer 3

I feel the effects of it for 6 hours.

Answer 4

When I was takeing Ativan at this does I only felt it for about 3-4 hours. I don't know how long it stays in your system....but I had to get off of it because it stopped working for me after 2 weeks. I was even upping the dose and still nothing. How often are you takeing it?