However, in her words, she thought she there would be more, reports Tass.
"I have taken three doping tests at the Olympic Games already. As a matter of fact, I thought I would have to take more. However, it's not over till it's over," she said in an interview with Russia's Match TV channel on Wednesday.
Yefimova will also compete in the 200m breaststroke at Rio.
Earlier this year, Yuliya Yefimova was denied an entry to the Rio Olympics in connection with an infringement on the anti-doping rules dating back to 2013.
The Court of Arbitration for Sports (CAS) entertained her lawsuit against FINA (the international swimming federation) and the Russian Olympic Committee and cleared her road to Rio on August 4.
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