diet pills effects

do diet pills with hoodia in them have any negative side effects?

i am trying to lose about 15-20 pounds in the next 6 weeks. i will be changing my diet and doing cardio every day along with yoga two times a week. is this a reasonable amount of weight to lose in such a short time and would a diet pill help?

Phentermine:
What is phentermine?
Phentermine is a sympathomimetic amine, which is similar to an amphetamine. It is also known as an “anorectic” or “anorexigenic” drug. Phentermine stimulates the central nervous system (nerves and brain), which increases your heart rate and blood pressure and decreases your appetite.
Phentermine is used as a short-term supplement to diet and exercise in the treatment of obesity.
Phentermine may also be used for purposes other than those listed in this medication guide.

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