To examine the effects of classification on treatment in major depressive disorder (MDD).
Method:
This is a narrative review.
Results:
MDD is a highly heterogeneous category, leading to problems in classification and in specificity of treatment. Current models classify all depressions within a single category. However, the construct of MDD obscures important differences between severe disorders that require pharmacotherapy, and mild-to-moderate disorders that can respond to psychotherapy or remit spontaneously. Patients with mild-to-moderate MDD are being treated with routine or overly aggressive pharmacotherapy.
Conclusions:
The current classification fails to address the heterogeneity of depression, leading to mistreatment.
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