This invention relates to methods of treating posttraumatic stress disorder and acute stress disorder using pharmaceutical compositions comprising cyclobenzaprine, amitriptyline, or pharmaceutically acceptable salts thereof. In particular, it relates to methods of treating posttraumatic stress disorder or one or more symptoms thereof in a subject who has experienced a traumatic event less than or equal to about 9 years prior to the commencement or treatment. It also relates to methods of treating acute stress disorder or one or more symptoms thereof in a subject who has experienced a traumatic event less than or equal to about 1 month prior to the commencement of treatment.
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