The present invention relates to treatment of a psychiatric condition, for example resistant depression (RD), bipolar disorder (either threshold or sub-threshold) and/or major depressive disorder via application of repetitive transcranial magnetic stimulation with a drug treatment, in particular application of repetitive transcranial magnetic stimulation with treatment to modulate the activity of the neurones and induce neuroplasticity and the use of Thyroid hormone treatment to increase quantity or activity of thyroid hormones, for example for treatment of thyroid dysfunction. Patients may be selected for treatment by testing for the presence of normal thyroid function.