Manufactured by Jean-Marie in Hong Kong, Redusa uses the active ingredient Phentermine hydrochloride. It is meant for severe cases of obesity in combination with certain obesity related medical conditions. However, it is not commonly sold as a form of Phentermine in the United States or in European nations. As far as we have been able to find, it is not really sold anywhere, especially not above other forms of Phentermine. The dose is unsure, but the side effects are most likely those of any Phentermine supplement: Changes in sex drive, constipation, diarrhea, dizziness, dry mouth, exaggerated feelings of depression or elation, headache, high blood pressure, hives, impotence, inability to fall or stay asleep, increased heart rate, overstimulation, restlessness, stomach or intestinal problems, throbbing heartbeat, tremors, unpleasant taste, and sudden extreme weight gain.