I used to take clonazepam but stopped because it was causing a side effect. Lately I've been getting anxious at night though. So I've been taking lorazepam 1mg tablet. But it didn't work all that well. It worked well in the past so I don't understand it. The tablet is very powdery in the bottle now and very easy to break in half. So I'm just wondering whether medication like lorazepam has something like a due date. Its actually about 2 years old.