Despite all positive effects of doping on the body they could be dangerous. Possible side effects of anabolic steroids can be avoided by choosing the right form (oral or injectable) and combination as well as by taking reasonable androgenic dosages. It has to be mentioned, that the most side effects of drugs disappear after the cycle is completed. Moreover, many of them can be blocked during the cycle by using respective supplements. Therefore, in order to avoid possible negative consequences one shall pay attention to studying information about the drugs prior to use them.
Diarrhea is more common and sometimes more severe with flutamide than with other NSAAs.  In a comparative trial of combined androgen blockade for prostate cancer, the rate of diarrhea was 26% for flutamide and 12% for bicalutamide.  Moreover, 6% of flutamide-treated patients discontinued the drug due to diarrhea, whereas only % of bicalutamide-treated patients did so.  In the case of antiandrogen monotherapy for prostate cancer, the rates of diarrhea are 5–20% for flutamide, 2–5% for bicalutamide, and 2–4% for nilutamide .  In contrast to diarrhea, the rates of nausea and vomiting are similar among the three drugs.