In some case studies, it has been observed that people who have been taking the dosages of Phentermine in 27.5 mg for 13 weeks lost approximately 13.9 pounds, which is 6.3 kg. Apart from that, it depends on each, and everyone’s body structure and a diet and exercise one does. But there are few cases where the customer did not have any effect and got no result despite having it as it was prescribed. And the ones who did get results were affected with side-effects.