"Britney was diagnosed with Attention Deficit Hyperactivity Disorder in her teens and used to take medication for it,"

 "The medication helped her deal with it, however, she can't take it now because it interferes with the other medications she takes for her mental health issues. Britney's current team of doctors strictly prohibit her from taking Adderall or Ritalin, which are commonly given to people with ADHD.

"Simon was made fully aware of Britney's medical history before the contract was signed, so this certainly isn't a big surprise that she needs to take breaks during the audition process. Look, Britney basically has the attention span of a 10-year-old at times. It's not alarming to Simon at all and he is fully supportive of Britney doing whatever she needs to do during filming."