National patterns in antidepressant medication treatment.

CONTEXT

Antidepressants have recently become the most commonly prescribed class of medications in the United States.

OBJECTIVE

To compare sociodemographic and clinical patterns of antidepressant medication treatment in the United States between 1996 and 2005.

DESIGN

Analysis of antidepressant use data from the 1996 (n = 18 993) and 2005 (n = 28 445) Medical Expenditure Panel Surveys.

SETTING

Households in the United States.

PARTICIPANTS

Respondents aged 6 years or older who reported receiving at least 1 antidepressant prescription during that calendar year.

MAIN OUTCOME MEASURES

Rate of antidepressant use and adjusted rate ratios (ARRs) of year effect on rate of antidepressant use adjusted for age, sex, race/ethnicity, annual family income, self-perceived mental health, and insurance status.

RESULTS

The rate of antidepressant treatment increased from 5.84% (95% confidence interval [CI], 5.47-6.23) in 1996 to 10.12% (9.58-10.69) in 2005 (ARR, 1.68; 95% CI, 1.55-1.81), or from 13.3 to 27.0 million persons. Significant increases in antidepressant use were evident across all sociodemographic groups examined, except African Americans (ARR, 1.13; 95% CI, 0.89-1.44), who had comparatively low rates of use in both years (1996, 3.61%; 2005, 4.51%). Although antidepressant treatment increased for Hispanics (ARR, 1.75; 95% CI, 1.60-1.90), it remained comparatively low (1996, 3.72%; 2005, 5.21%). Among antidepressant users, the percentage of patients treated for depression did not significantly change (1996, 26.25% vs 2005, 26.85%; ARR, 0.95; 95% CI, 0.83-1.07), although the percentage of patients receiving antipsychotic medications (5.46% vs 8.86%; ARR, 1.77; 95% CI, 1.31-2.38) increased and those undergoing psychotherapy declined (31.50% vs 19.87%; ARR, 0.65; 95% CI, 0.56-0.72).

CONCLUSIONS

From 1996 to 2005, there was a marked and broad expansion in antidepressant treatment in the United States, with persisting low rates of treatment among racial/ethnic minorities. During this period, individuals treated with antidepressants became more likely to also receive treatment with antipsychotic medications and less likely to undergo psychotherapy.