Overdose Effects
If you take too much phentermine, it may cause unwanted effects or become habit-forming, but generally it is unlikely for an overdose of Phentermine to be life-threatening. For you to know, symptoms of overdose may include restlessness, tremor, rapid breathing, confusion, nausea, vomiting, diarrhea, and stomach cramps.
Regardless to the relative safety of phentermine, once you suspect or know for sure of the overdose, the first thing to do must be to contact your local poison control center or emergency room immediately to solve this problem as soon as possible. Remember that self-treatment of phentermine overdose is never an option.