Answer by  
                                                                                          EmmaKitty (236)
                                                            
                          
                          
                                                           People have lost weight with phentermine. Phentermine belongs to a class of prescription weight loss drugs known as stimulant appetite-suppressants. This drug achieves an appetite-suppressant effect by stimulating the central nervous system, making it similar to another class of medications — amphetamines. Possible side effects include: Anxiety, rapid heartbeat, chest pain, headache, dizziness, insomnia, high blood pressure, shortness of breath.