What diet pills are permanent now? Why do some diet pills disappear in the market after a few years? Because many follow-up tests have found that diet pills have side effects, but it is only a matter of degree. Diet pills will make your heart rate faster, insomnia, diarrhea and shortness of breath at night, and will rebound uncontrollably after stopping for a while. . . Every medicine is three-point toxic, and I would rather not take diet pills at night. You'll regret eating it.