This study compared the effect of an auditory distractor on working memory in participants with and without ADHD. Undergraduate students (N-65) were asked to complete a memory task for 25 words in which a pulsating beep sounded from the computer during the middle 5 words. The results indicated that students with ADHD performed significantly worse in the presence of a distraction than those without ADHD. However, the present study also examined the effect of ADHD medication, taken the same day, on working memory. The results indicated that participants with ADHD who had taken medication performed better than those who did not