Historical Facts
You may be interested to know that phentermine was at first introduced as one of two drugs in the Fen-Phen, another obesity fighter medication which was very popular in the world market mid-ninetieth of the previous century. The other component of Fen-Phen accompanying phentermine was fenfluramine (also known as dexfenfluramine), which was reported as valvular heart disease and pulmonary hypertension producer and withdrawn from the U.S. market in 1997.
Phentermine was not reported as a harmful medicine, so it is now available by itself in most countries including the United States.