A stimulant similar to amphetamines, Obenix is an appetite that affects the central nervous system. When used together with diet and exercise, Obenix can work for a short period of time of just a few weeks for those severely obese individuals who also suffer from risk factors such as high blood pressure, high cholesterol, or diabetes. Taking this, also known as Phentermine, with other drugs such as Phen-Fen or Redux can cause the fatal lung disorder known as pulmonary hypertension, which could ultimately result in death. Dosage will depend on the individual. But with this Phentermine product. But with any dose, you should not increase your dose to try to see more results, as it may pose serious health risks.