Phentermine has been proven to help obese individuals achieve amazing and noticeable weight loss results, though it is not right for everyone. Your doctor will be able to determine whether or not this medication is right for you by taking a detailed medical history as well as finding out which medications you are currently on. Those who are only slightly overweight should not take Phentermine, as it is intended solely for those who have severe weight problems. Drinking while taking this medication is not recommended, as it can significantly increase its effects.