Phentermine is used to speed weight loss in overweight people. It is used together with diet and exercise to treat obesity, especially in people with risk factors such as high blood pressure, high cholesterol, or diabetes. Take phentermine exactly as prescribed by your doctor. Follow all directions on your prescription label and read all medication guides or instruction sheets

After its oral consumption, Phentermine takes around 3 to 4 hours to start showing its effects. Doing exercise as well as having a healthy diet is crucial when taking the prescribed dosages of this medication drug. Phentermine can stay in an individual’s body for approximately 20 hours. There are some factors that influence the efficacy of the drug.The liver is responsible for metabolizing any medicine. Hence, the process of metabolism is one of the factors that affect the duration of effectiveness of Phentermine. For different individuals, this medicine may work differently.