Although there are a plethora of weight loss drugs on the market, they are however generally classified as being either prescription or non-prescription based. The prescription weight loss drugs, also referred to as ethical drugs, are drugs which have been approved by the FDA and which can only be bought through the approval of a doctor Phendimetrazine Tartrate 35 Mg,

Equally, the various FDA approved prescription weight loss drugs can be further classified into two different groups based on their specific duration of use - i.e. being either short- or long-term. This article takes a look at the currently FDA approved short-term weight loss drugs and coincidentally, they all happen to be appetite suppressing medications.

Appetite suppressing medications work by either decreasing appetite or increasing the feeling of fullness. They generally work on the basic idea of controlling the hypothalamus - the appetite control center of the brain - by increasing one or more brain chemicals that modulate mood and appetite.

The approved appetite suppressing drugs belong to a group of drugs known as phenethylamines - somewhat similar to amphetamines. Amphetamines are any of a group of powerful stimulant drugs that act on the central nervous system and which normally causes increase in heart rate, blood pressure, and energy levels. Despite the fact that phenethylamines are chemically similar to amphetamines, they however have a significantly reduced incidence of the side effects associated with amphetamines.

The FDA-approved appetite suppressing medications affect the central nervous system through several different active ingredients and modulation mechanisms. These appetite suppressing medications can be divided into three major active ingredient groups as follows:

Phentermine

These are probably the most widely used short-term prescription-based weight loss drugs today. Phentermine based appetite suppressants were first approved in 1959 and specifically to be used for short-term treatment of obesity, usually not longer than six months.'

The main active ingredient used in Phentermine is Phentermine hydrochloride which stimulates a group of neurotransmitters known as catecholamine including epinephrine (also known as adrenaline), norepinephrine, and dopamine. Phentermine hydrochloride affects the central nervous system by triggering a "fight or flight" state in the body.

This condition is generally believed to cause the brain not to receive the hunger signals the stomach might be sending to it because of its concentration on how to respond to the immediate and more serious need for energy caused by the "fight or flight" signal.