FC25: Use of antidepressants in older adults in Sweden 2006-2020

Abstract

Objectives:

Antidepressants are among the most prescribed medications in older adults. In this study we aimed to explore the trends in the use of antidepressants in older Swedish adults between 2006 and 2020.

Methods:

We conducted a retrospective repeated cross-sectional study, where we included all older adults (65 years and older) registered in the Swedish National Prescribed Drug Register between 2006 and 2020. We estimated the use of antidepressants in older people for each year, across the 21 Swedish regions.

Results:

The Swedish population of older adults increased from 1.2 million in 2006 to 1.7 million in 2020. There was an increase in antidepressant use from 12.4% in 2006 to 13.2% in 2019 and 13.8% in 2020. We found that the use of antidepressants varied across age groups, older adults 85+ had a higher use (18.2% in 2006, 18.2% in 2019 and 19.4% in 2020) compared to those 65-74 years of age (9.6% in 2006, 11.7% in 2019 and 12.2% in 2020).

Individuals who used antidepressants were generally older (mean age = 77.7) and more often women, compared to individuals who did not use antidepressants (mean age =75.7). Moreover, individuals who used antidepressants also had a higher use of benzodiazepine compared to non-users (25.1% vs. 6.4% in 2006; 16.0% vs. 2.7% in 2019 and 15.6% vs. 2.5% in 2020), sleeping drugs (27.7% vs. 10.9% in 2006; 25.2% vs. 9.3% in 2019 and 24.6% vs. 8.9% in 2020), first generation antipsychotics (1.1% vs. 4.0% in 2006 and 0.3% vs. 1.3% in 2020) and second-generation antipsychotics (1.0% vs. 6.3% in 2006 and 0.8% vs. 6.3% in 2020).

Citalopram was the most frequently used antidepressant. However, its use declined from 2006 to 2020 and instead we observed an increase in the use of mirtazapine and sertraline. The prescription of tricyclic antidepressants (TCA), selective monoamine-A inhibitors and lithium was relative stable over time.

Overall, antidepressants were prescribed at doses close to the defined daily doses (DDD), except for TCA, mianserin, bupropion and venlafaxine which were often prescribed at lower doses.

Conclusions:

We found a slight increase in antidepressant prescription in Sweden between 2006 and 2020, with older adults 85 years and older using more antidepressants compared to those 65-74 years of age. Use of antidepressants was associated with increased use of benzodiazepines, sleeping drugs (zolpidem and zopiclone), as well as first- and second-generation antipsychotics. Citalopram was the most prescribed antidepressant, but its use has declined over time.