Phentermine is an appetite suppressant of the amphetamine and phenethylamine, it is approved as an appetite suppressant to help reduce weight in obese patients when used short-term and combined with exercise, diet, and behavioral modification. It is typically prescribed for individuals who are at increased weight risk. Phentermine is habit forming. If you experience these effects, avoid hazardous activities.You can become physically and psychologically dependent on this medication, and withdrawal effects may occur if you stop taking it suddenly after several weeks of continuous use. Talk to your doctor about stopping this medication gradually. Phentermine is a sympathomimetic amine, which is similar to an amphetamine. In 1959 phentermine first received approval from the FDA as an appetite suppressing drug. Phentermine hydrochloride then became available in the early 1970s. It was previously sold as Fastin® from King Pharmaceuticals for SmithKline Beecham, however in 1998 it was removed from the market. Medeva Pharmaceuticals sells the name brand of phentermine called Ionamin® and Gate Pharmaceuticals sells it as Adipex-P®. Phentermine is also currently sold as a generic. Since the drug was approved in 1959 there have been almost no clinical studies performed. Phentermine is habit forming. If you experience these effects, avoid hazardous activities.You can become physically and psychologically dependent on this medication, and withdrawal effects may occur if you stop taking it suddenly after several weeks of continuous use. Talk to your doctor about stopping this medication gradually. Phentermine is a sympathomimetic amine, which is similar to an amphetamine. Generally, phentermine appears to be relatively well tolerated. It can produce side effects consistent with its catecholamine-releasing properties, tachycardia and elevated blood pressure, but the incidence and magnitude of these appear to be less than with the amphetamines. Because phentermine acts through sympathomimetic pathways, the drug may increase blood pressure and heart rate. It may also cause palpitations, restlessness, and insomnia. Additionally, phentermine has the potential to cause physical and psychological dependence. Phentermine is a drug that suppresses the appetite for weight loss. Phentermine should be combined with exercise and diet for the short term treatment of obesity. Drug interactions may occur with some tricyclic antidepressants or monoamine oxidase inhibitors.