This study aims to investigate the utility of d-cycloserine (DCS) for enhancing the effect of a novel psychosocial intervention, imagery rescripting (ImRs), in adult women with mild to moderate PTSD symptoms after experiencing sexual assault or interpersonal violence. Participants will receive 4 sessions of either cognitive behavioral therapy with imagery rescripting or cognitive behavioral therapy with imaginal exposure and will receive study medication (DCS or Pill placebo) prior to Session 2 and Session 3.