The present invention relates to methods for the treatment or prevention of symptoms associated with post-traumatic stress disorder, and related pharmaceutical compositions. Of particular interest are pharmaceutical compositions comprising a very low dose of cyclobenzaprine, alone, or in combination with an alpha-1-adrenergic receptor antagonist, a beta-adrenergic antagonist, an anticonvulsant, a selective serotonin reuptake inhibitor or a serotonin-norepinephrine reuptake inhibitor.