Desipramine plasma concentration and antidepressant response

Area of Science:

• Pharmacology
• Psychiatry
• Clinical Medicine

Background:

• Major depressive disorder (MDD) is a significant mental health condition.
• Treatment of MDD often involves antidepressant medications like desipramine hydrochloride.
• Individual patient response to antidepressants can vary widely.

Purpose of the Study:

• To investigate the correlation between desipramine hydrochloride plasma concentration and antidepressant efficacy.
• To establish a therapeutic plasma concentration threshold for desipramine hydrochloride.

Main Methods:

• Thirty inpatients with unipolar depression and melancholia were treated with desipramine for three weeks.
• Patients had a baseline Hamilton Depression Rating Scale score of 18 or higher.
• Plasma concentrations of desipramine hydrochloride were measured and correlated with clinical response.

Main Results:

• Eighty-nine percent of patients with plasma concentrations >115 ng/mL responded to treatment.
• Only 14% of patients with plasma concentrations <115 ng/mL responded.
• Increasing dosage to achieve concentrations ≥125 ng/mL converted ten non-responders to responders.

Conclusions:

• Desipramine hydrochloride plasma concentration is a significant predictor of antidepressant response.
• A plasma concentration guideline of 125 ng/mL is suggested for optimal desipramine effectiveness.
• Therapeutic drug monitoring of desipramine may improve treatment outcomes in depression.