Phentermine works by triggering a fight-or-flight response. It acomplishes this by changing the Seratonin levels in the brain and releasing Adrenaline and other related chemicals. This can result in, among other things, heightened blood-pressure, a feeling of panic, insomnia (or, in some, drowsiness) and a loss of appetite.

It is only recommended for moderate weight-loss and for short-term use. It is known to be dangerous for people who are already suffering from high blood-pressure or Glaucoma. It can be addictive, and abruptly quitting ("cold turkey") has been known to cause lethargy, depression, and similar related conditions. Some

Sources: http://en.wikipedia.org/wiki/Phentermine [Wikipedia] http://www.medicinenet.com/phentermine/article.htm [Medicine Net] http://www.fda.gov/cder/news/phen/fenphenqa2.htm [FDA.Gov] http://www.nlm.nih.gov/medlineplus/druginfo/medmaster/a682187.html [Medline Plus] http://www.Health-Hack.com/ [Health-Hack.com]
About the Author

Kevin Kennedy-Spaien is a writer specializing in health issues related to technology. He can be read regularly at Health-Hack.com ( http://www.health-hack.com/ ), The Health Portal for Computer Geeks and Gadget Freaks.