This is a double-blind, randomized, placebo-controlled study evaluating the efficacy and safety of high-frequency (20Hz) rTMS applied to the right dorsolateral prefrontal cortex for 6 weeks. The primary objective is to evaluate the change in PTSD symptoms before and after six weeks of high-frequency rTMS treatment as measured by the Clinician Administered PTSD Scale (CAPS) in both active and control groups.