The relationship between living arrangement and adherence to antiepileptic medications among individuals with developmental disabilities.

Background: Non-adherence to antiepileptic drugs (AEDs) is associated with considerable morbidity and mortality in the general population but little is known about adherence in individuals with intellectual disability (ID).

Method: Using the records of a closed pharmacy billing system over a 30 month period, we examined the medication non-adherence rates for AEDs among 793 individuals with ID. We calculated the medication possession ratio (number of days each participant was in possession of an AED), and defined non-adherence as 25% or more of the exposure days without the possession of an AED. All participants studied had filled prescriptions for AEDs spanning at least 6 months.

Results: Controlling for age and gender, we found non-adherence rates varied by living arrangement. Compared with those living in group homes, individuals with ID living in family homes or in semi-independent settings were significantly less adherent to AEDs (P < 0.0003).

Conclusion: Non-adherence to AEDs is a potential medical risk for individuals with ID that is significantly impacted by the type of community living arrangement.