It is safe: Under your physician supervision. Like many other drugs Fastin (phentermine) has many side effects: dry mouth, insomnia, irritability, nausea, vomiting, diarrhea, just to name a few. The excessive weight has also certain health risks. Your doctor recommended this medication because the benefit to you is greater than the risk of side effects. Hope it helps.
Answered 9/28/2016
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