Thyrotropin and prolactin responses to protirelin (TRH) prior to and during chronic imipramine treatment in patients with panic disorder

The effects of protirelin [thyrotropin-releasing hormone (TRH)] administration on the release of thyrotropin (TSH) and prolactin (PRL) were examined in 14 patients with panic disorder prior to and during chronic treatment with imipramine. During imipramine treatment, the patients exhibited an increase in their TSH response to TRH (Δ Δ_{max TSH = 3.65 ± 6.02 μIU/ml}, p0.05) and in their PRL response to TRH (Δ AUC_PRL = 734 ± 965 ng/ml/45 min, p < 0.005). Several behavioral measures correlated with the neuroendocrine measures during imipramine therapy. These preliminary findings might suggest a role for changes in dopaminergic function in the clinical effects of imipramine in patients with panic disorder.