No, your doctor may perscribe it to you or like a lot of us we order it online. I ordered mine from US-Meds.com I paid $89 for a 90 day supply of the 37.5mg. It took about 2 weeks to get it.
I've taken both the yellow 30 mg pills as well as the white/blue 37.5 pills. Surprisingly, the 37.5 made me less jittery. Both work for suppressing appetite though.