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Phentermine is a sympathomimetic drug, which means it acts in the manner of naturally occurring chemicals in the body that stimulate the sympathetic nervous system. The common naturally occurring substances that stimulate the sympathetic nervous system are the catecholamine’s ***** Marcyads Classified Admin Has Removed Bad Words ***** *** All Spam Ads will Be Reviewed and Deleted ***. and noradrenaline and the mono-amine, dopamine. All of these materials serve as both neurotransmitters, facilitating communication between nerve cells, and as hormones that allow distant cells to exchange signals without the intervention of neurons. The sympathetic nervous system is designed to prime the body for stress and rapid action, the so called “fight or flight” response. These chemicals signal smooth muscle within the walls of large and medium sized arteries to contract, reducing the volume available to the fluid and cell mass that comprise the blood, raising blood pressure. They act as dromotropes, chronotropes and innotropes on the heart. When influenced by such naturally occurring chemicals or by phentermine online, the heart will contract more often in a given period of time, the organ will pump a larger volume of blood with each contraction and the internal nerves of the heart, the bundles of His, will conduct impulses more rapidly. In addition. This relatively inefficient biochemical process is used to increase the concentration of glucose in the blood to serve as an immediately usable fuel for muscles and the brain in a crisis.