Even though there are numerous advantages of Phentermine drug but at the same we cannot neglect the disadvantages. Of course there are some disadvantages and that are to be known to the patient so that he can be alert while opting for the Phentermine drugs.

There are mainly two major disadvantages of Phentermine and one of them is allergic reaction and the second one is minor symptoms that stay for shorter period. Out of these the first disadvantage of allergic reactions are considered to of serious nature. Following are some of the reactions that occur while taking Phentermine.