Phentermine  (marketed as adipex) is one of two drugs in the [url=http://dic.blogopt.com/fen-phen]fen-phen[/url] anti-[url=http://dic.blogopt.com/obesity]obesity[/url] medication, the other being [url=http://dic.blogopt.com/fenfluramine]fenfluramine[/url] or dexfenfluramine.  fenfluramine was withdrawn from the [url=http://dic.blogopt.com/united_state] u.s.[/url] market in [url=http://dic.blogopt.com/1997]1997[/url] after reports of valvular heart disease and [url=http://dic.blogopt.com/pulmonary_hypertension]pulmonary hypertension[/url].
phentermine is still available by itself in most countries, including the u.s. internationally, phentermine is a schedule iv drug under the [url=http://dic.blogopt.com/convention_on_psychotropic_substances]convention on psychotropic substances[/url] in the [url=http://dic.blogopt.com/united_states]united states[/url], it is classified as a [url=http://dic.blogopt.com/schedule_iv]schedule iv[/url] [url=http://dic.blogopt.com/controlled_substance]controlled substance[/url] under the [url=http://dic.blogopt.com/controlled_substances_act]controlled substances act[/url].
phentermine, as many other prescription drugs, works with [url=http://dic.blogopt.com/neurotransmitter]neurotransmitters[/url] in the brain. it is a centrally-acting [url=http://dic.blogopt.com/stimulant]stimulant[/url] chemically related to the [url=http://dic.blogopt.com/amphetamine]amphetamines[/url]. it stimulates [url=http://dic.blogopt.com/neuron]neuron[/url] bundles to release a particular group of neurotransmitters known as [url=http://dic.blogopt.com/catecholamine]catecholamines[/url]; these include [url=http://dic.blogopt.com/dopamine]dopamine[/url], [url=http://dic.blogopt.com/epinephrine]epinephrine[/url] (also known as adrenalin), and [url=http://dic.blogopt.com/norepinephrine]norepinephrine[/url] (noradrenalin). this is the same mechanism of action as other stimulant appetite suppresants such as [url=http://dic.blogopt.com/sibutramine]sibutramine[/url] and [url=http://dic.blogopt.com/dextroamphetamine]dextroamphetamine[/url].
the neurotransmitters signal a [url=http://dic.blogopt.com/fight-or-flight_response]fight-or-flight response[/url] in your body which, in turn, puts a halt to the hunger signal. as a result, you lose your appetite because your brain doesn’t receive the hunger message. this is perhaps because of phentermine’s effects on [url=http://dic.blogopt.com/leptin]leptin[/url] levels in the brain. it is theorized that phentermine can raise levels of leptin which signal [url=http://dic.blogopt.com/satiety]satiety[/url]. it is also theorized that increased levels of the catecholamines are partially responsible for halting another chemical messenger known as [url=http://dic.blogopt.com/neuropeptide_y]neuropeptide y[/url]. this chemical initiates eating, decreases energy expenditure, and increases fat storage.