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In page Eddy Merckx:

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On 8 May 1977, Merckx, along with several other riders, tested positive for the stimulant pemoline at La Flèche Wallonne.[17][18][19][20][21] The group of riders was charged by the Belgian cycling federation, and were each given a 24,000 pesetas fine and a one-month suspension.[21] Initially, Merckx announced his intention to appeal the penalty, saying he only took substances that were not on the banned list.[21] His eighth-place finish in the race was voided. Years later, Merckx said he did take a banned substance, citing that he was wrong to have trusted a doctor.[citation needed]