GENEVA, Sept. 2 (Xinhua) -- Five-time Olympic dressage champion Isabell Werth of Germany was banned for six months on Wednesday after her horse failed a doping test.

The International Equestrian Federation said that Werth was responsible for her horse Whisper's positive test for fluphenazineat an event in Wiesbaden, Germany, in May. The anti-psychotic drug controls aggression in humans and is not licensed for use on horses.

The FEI says Werth is suspended through Dec. 22, but will not be barred from the 2012 London Olympics.

Werth won individual dressage gold at the 1996 Atlanta Games, and her fourth team gold with Germany in Beijing. She also has three Olympic silver medals.

The 40-year-old rider was provisionally suspended in June and issued a statement that her horse suffered from a nervous disorder known as shivering syndrome.

Werth was also fined 3,500 Swiss francs (about 3,300 U.S. dollars).

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