For your information, Phentermine is a drug which belongs to the class of amphetamine and phenethylamine. It's not illegal though because in 1959, the FDA approved its use as an appetite suppressant. This is the reason why it has been widely used to help fight obesity and make you lose weight.
A lot of people have been looking how to buy Phentermine without prescription and I wish you luck on this. I will advise though that you complement your regimen with exercise and a balanced diet so that you will receive the full benefits of Phentermine.