Don't know if you read my thread I posted, RW...
I was on it about a week or two when I noticed that my foot drop wasn't as bad, and I was walking a lot steadier.

But the med just did such a number on my stomach I finally gave up on it. I had gone off of it for a couple of weeks in June, but my neuro asked me to try it again. I went back on in July, but then I called him this week about my stomach/gastro pain and he said just go off. They're getting feedback about patients' side effects, and they are varied (the nurse didn't tell me what they were).
I've been off of it three days, and I notice my foot is already stiffer and harder to pick up...darned if you do, and darned if you don't...