Sixty women with PTSD symptoms due to a sexual assault or interpersonal violence at least three months prior to intake will receive 4 sessions of either: CBT + ImRs, or CBT + imaginal exposure (IE). In sessions 2 and 3, participants who receive CBT with ImRs will be randomized to receive either DCS or placebo (PLA). Participants who receive CBT with IE will receive a placebo pill prior to sessions 2 and 3.