Merida versus Phentermine

I've taken Phentermine (37.5 mg) off and on over the past few years and usually it's been quite effective in helping me take off the weight. I recently began taking it again (for the past month) to get rid of this post-pregnancy weight and noticed that it just doesn't seem to be working as well as before. I have an appointment with my doctor on Wednesday and was wondering if I should inquire about a prescription for Merida instead of a refill on Phentermine. Just curious whether anyone has switched between these two diet drugs and whether they found the Merida to be more effective then the Phentermine. Also, I'd be lying if I didn't admit to enjoying the euphoric/energenic feeling that I experience with Phentermine. Does Merida work the same way?

Thank you, in advance, for your response.
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