Ashton is right in all respects except tapering.
Ativan has a four hour half life so max dose is only good for 16 hours out of the twenty four. So you get rebound. The other benzos are designer drugs that work on specific part of the brain where valium works on all parts. They are like valium with parts cut out. Some are very good for restless leg but not so good for the anxiety that comes with it.
Valium is still the safest and always will be the safest benzo because it treats all aspects of anxiety, there are no holes in its effectiveness. You don't actually become tolerant to benzos, what happens is that since all neurons are connected you build a path around it. So you need to do something mental for the anxiety before you can stop the chemical. Cognitive restructuring is that something. All benzos are muscle relaxants. They work on the Serotonin in the synapses in the body also. So they lower blood pressure and pulse when nothing else does. They do nothing to salvage Serotonin so are not antidepressants but do take some of the load off Serotonin. They are anti anxiety because their action is to stop information overload. They do this by blocking some of the receptors at each Synapse. Ativan can do this very fast but not for long. Valium is the opposite. Xanax and clonazepam block specific receptors so are prescribed for specific causes of anxiety. Valium gives you a smoother transition because it blocks all reasons for anxiety.
Unfortunately few GPs have enough information so they do the guessing game till they get the Benzo that works. Like they do with SSRIs.
---------- Post added at 10:30 ---------- Previous post was at 10:22 ----------
Before I get comments, Tapering did not work for me. I increased the time between doses without lowering the dose till the time was twice as long then cut the dose in half and did it again. No side effects of any consequence. Eventually just forgot to take them.