As early as the age of 18, Krieger began developing male characteristics. Eventually, years of doping left him with many masculine traits. By 1997, Krieger underwent sex reassignment surgery and changed his name to Andreas.  Krieger had "felt out of place and longed in some vague way to be a boy", and said in a 2004 New York Times interview that he was "glad that he became a man". However, he felt that receiving hormones without his consent deprived him of the right to "find out for myself which sex I wanted to be."  Krieger's sex change operation dominated Germany's news headlines and focused widespread attention on the legacy of doping in East Germany , leading other former athletes to speak out in public for the first time.
Five athletes tested positive for the stimulant bromantan and were disqualified by the IOC, but later reinstated after an appeal to the Court of Arbitration for Sport: swimmers Andrey Korneyev and Nina Zhivanevskaya , Greco-Roman wrestler Zafar Guliyev and sprinter Marina Trandenkova , all from Russia, and the Lithuanian track cyclist Rita Razmaitė . Dr. Vitaly Slionssarenko, physician to the Lithuanian cycling team and team coach Boris Vasilyev were expelled from the games.    The CAS overturned the IOC decision, because bromantan had only recently been added to the prohibited list,  and the athletes and officials were reprimanded.    The Russians had argued that bromantans wasn't a stimulant and thus not banned.