What is phentermine?
Oral phentermine Hydrochloride (HCL) is sold for weight loss. It is in the Sympathomimetic family of appetite suppressants (used for the short-term management of exogenous obesity.)
When used in conjunction with diet, exercise, and behavior therapy, phentermine may help you to lose weight while you are learning new ways to eat and exercise.
How does this work?
The hypothalamus is the region of the brain that controls the autonomic nervous system, regulating sleep cycles, body temperature, appetite, etc.
This should NOT be used as a substitute for proper diet or exercise. For maximum effects, it must be used in conjunction with a reduced-calorie diet and/or exercise.
Any modifications in your diet, activity level, and behavior must be developed and continued long-term in order to continue losing weight and prevent the lost weight from returning.
How long should I take phentermine?
It is usually prescribed for short periods of 3 months, as the effects of phentermine tend to wear off after some time, while side effects remain.
How it all began
This formula is the most commonly prescribed prescription appetite suppressant, accounting for 50% of the prescriptions. Part of this reason is because it’s significantly cheaper than the other major FDA-approved diet drugs, Meridia and Xenical.
This first received approval from the Food and Drug Administration (FDA) in 1959 as an appetite suppressant for the short-term treatment of obesity.
In the US, phentermine is currently sold under the brand names Ionamin® (Medeva Pharmaceuticals) and Adipex-P® (Gate Pharmaceuticals). It is also available as a generic medication, known as ‘phentermine’.
Previously, it was sold under the name Fastin® (formerly produced by King Pharmaceuticals for SmithKline Beecham). In December 1998, SK-Beecham withdrew Fastin from the market.
Since phentermine is an older drug, no new efficacy trials have been conducted. The one notable exception, are several trials on the combination of phentermine and fenfluramine in the early and mid-1990s.