To evaluate the comparative efficacy of 3 antidepressants, each representative of a distinct psychopharmacologic class, in the treatment of depressive disorders associated to Parkinson disease with dementia (PDD).

A group of 23 patients, mean age 72.1, diagnosed with PDD for at least 2 years, who were admitted in our department for a major depressive episode (DSM IV TR), received antidepressant treatment with escitalopram (mean dose 15 mg daily, n=7), duloxetine (mean dose 45 mg daily, n=8) or trazodone (mean dose 150 mg daily, n=8). All patients received treatment for PDD with rivastigmine or donepezil continuously, for at least 12 months. The distribution of patients on the antidepressant treatment was randomized, in a single-blind manner. Patients were evaluated monthly, for 6 months, using Montgomery Asberg Depression Rating Scale, Hamilton Rating Scale for Depression- 17 items, Clinical Global Impression-Improvement and Mini Mental Status Examination.

Patients treated with duloxetine had the most significant improvement in the depressive symptoms, as the endpoint MADRS (-18.6+/-2.3, p< 0.01), HAMD (-13.2+/-1.1, p< 0.01) and CGI-I (- 3.2+/-0.5, p< 0.01) scores reflected. The differences between escitalopram and trazodone didn’t reach a significant level but, overall, both improved the depressive symptoms compared to baseline (p< 0.05). The difference between duloxetine and the other two antidepressants became significant after 8 weeks (p< 0.01). The severity of dementia symptoms didn’t vary significantly between the three groups at endpoint.

Duloxetine had proven itself more efficient than escitalopram and trazodone in the improvement of the depressive symptoms in PDD.