Are prescription diet pills dangerous

[ChristySmiles]

Every time I go to a website for a nonprescription diet pill, it always says that prescription pills are dangerous and they have all these really scary side effects. But I was under the impression that if they are going to be prescription pills they need to be tested really carefully so as long as you use them properly, they won’t hurt you. Are these pills really dangerous or is that just a sales ploy for the over the counter versions?