To help patients temporarily reduce their weight, doctors prescribe Phentermine Online, an appetite suppressant that works by sympathomimetic amines. By stimulating the central nervous system and boosting the production of neurotransmitters like norepinephrine, phentermine reduces appetite and promotes weight reduction. It is typically recommended in addition to lifestyle modifications to diet and exercise. Although phentermine is a useful drug, it can also cause unwanted side effects like insomnia and an increased heart rate. It is recommended to use phentermine under close medical supervision for brief periods of time, as it can be abused and lead to dependence.