Can anyone advise me a replacement for phentermine?

Hi, everybody!

Does anyone know a safe replacement for phentermine?

I'm looking for something over the counter. My physician refuses to give me a prescription for phentermine as last time I had some unpleasant side effects.
An appetite suppressant is exactly what I'm looking for. Such pills help maintain my weight within the acceptable limits.

Please give me a hint if you know something.