Objective
Psychiatric advance directives allow patients with severe mental illness to document their preferences for particular medications. This study investigated the role of psychiatric advance directives in treatment choice and medication adherence.
Methods
A total of 123 persons with severe mental illness recorded medication preferences in psychiatric advance directives. The authors compared medication preferences to prescribed medications over 12 months, determined concordance between preferred and prescribed medications, and examined the effect of concordance on medication adherence at 12 months.
Results
Participants requested a median of two medications in their psychiatric advance directives (range, zero to six) and refused a median of one medication (range, zero to ten). At follow-up, the number of medications requested in psychiatric advance directives that were currently prescribed increased by 27%. (Wilcoxon matched pairs, p<.001). After correcting for the number of medications listed in the psychiatric advance directive, a 10% increase in concordance remained significant (p<.001). Being prescribed at least one medication requested in the psychiatric advance directive predicted higher medication adherence at 12 months, after the analysis controlled for relevant covariates (odds ratio=7.8, 95% confidence interval=1.8–34.0).
Conclusions
Providing information about medication preferences in psychiatric advance directives may increase prescribing of patient-preferred medications even in noncrisis settings. Patients who were prescribed medications that they request in advance were significantly more likely to adhere to medications, supporting the benefit of patient participation in medication choice. Psychiatric advance directives appear to be a clinically useful conduit for communicating patient medication preferences.