I take it. And isn't it supposed to last 9 hours? Is your dosage what was prescribed?

I take the instant release version. It's supposed to last 4 hours, but according to what I read online, hardly anyone gets that long. For me, it takes an hour to start working usually, then usually about 2 hours of effectiveness, gradually decreasing to nothing by the end of the 3rd hour.

Yes, my dosage is as prescribed. 10 mg 3 to 4 times/day depending on my schedule.