Attention deficit/ hyperactivity disorder (ADHD) is characterized by a preference of immediate over delayed rewards. 1Hz inhibitory repetitive transcranial magentic stimulation (rTMS) of the dorsolateral prefrontal cortex (DLPFC) has been shown to influence decisions of reward preference in adult subjects towards smaller immediate rewards.Here we examine the effects of high frequency (excitatory) DLPFC rTMS in a small sample of adult subjects with ADHD. A delay discounting task was applied before and after rTMS.After rTMS the preference of subjects with ADHD was changed in a marginally significant way towards larger but more delayed rewards compared to sham stimulation.These are pilot data which encourage further research on whether rTMS is not only able to discrupt the cortical circuits involved in attentional top-down control and the ability to wait longer times for larger rewards, but whether rTMS is able to both decrease as well as increase cortical excitability leading to different behavioral effects. Such behavioral effects could represent a clinically valuable therapeutic tool. However, a replication of our finding is needed in a larger independent sample.