The main reason why not all doctors prescribe the use of Phentermine is because of its addicting effects. Although Phentermine without prescriptions are available from the black market as well as unauthorized dealers, the risks involved are too great. Out of 100 companies selling Phentermine without prescriptions needed, only a low percentage is actually authorized by the FDA to manufacture and sell the drug. In fact, people are discouraged to buy Phentermine without prescription because of the potential physical and psychological addictive effects it has on users. To be on the safer side, check out the individual or company that sells Phentermine without prescription