The overarching goal of this project is to examine the effect of combining theta burst
stimulation (TBS) and N-acetylcysteine (NAC) on cocaine craving and brain response to cocaine images. Participants (N=96) will undergo a baseline MRI visit to assess craving and brain function, then be randomized to one of four SHAM / Placebo-controlled TBS / NAC treatment conditions. Following 3-days of medication (NAC or Placebo), return to the lab for a second MRI visit where brain function will be assess immediately before and after TBS or SHAM stimulation. Participants will be contacted via phone over the following 3-weeks to assess mood and craving.