Our DS9's main presentation is tics - he was on a 5 day steroid burst (60 mg prednisone a day for 5 days) and was a completely different child on day 6. Totally calm, focused and still. The tics began to return in a small way after a couple of days, and now they are still around, although they are 'smaller' than they used to be (mostly facial). The spring is always the worst time for him because of his allergies so his level of tics right now is good compared to previous years. The other issue for him, which is mild anxiety, went away too and is still not back, 4 months later.
We did a second burst a couple of months after the first and did not see the same results with the tics.