Your dose is really, really small so side effects should be minimal. Some drowsiness. That'll go away with time. Take a look at this website for a very comprehensive look at Klonopin side-effects: http://www.rxlist.com/cgi/generic/clonaz_ad.htm
Pay attention to the first column of Table 1. Those are from clinical trials and are accurate. The first column is for 1mg or less per day, and you probably won't be taking that much of it very often.
Klonopin "peaks" from 1-4 hours after the dose is administered. That's the official story, but it varies a great deal from person to person. For example, even when I was a little kid I always metabolized meds slowly. I don't even feel my Klonopin beginning to work until an hour and fifteen minutes or so, and that's if I took it on an empty stomach. My doctor said I should take it on an empty stomach, by the way.
Klonopin's not really designed to work on an as-needed basis. Plenty of people take it that way with good results, but they're not really taking full advantage of the medicine that way. Its slow onset just doesn't make it ideal for that kind of dosing, and it was designed to be dosed at least twice a day so that it would reach a steady plasma level. There's lots of info on Roche's website about
it (it and Valium are their top sellers, I think). And they've recently developed a wafer that works a lot faster. Ask your doctor about
Don't mean to imply that your doctor was "wrong" to put you on the K PRN. That's a medical decision.
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