Classifying intervention modifications in the community pharmacy context: A demonstration study

The objectives of this study were to apply the Stirman and colleagues' framework to identify modifications made to a motivational interviewing (MI)-based intervention for medication nonadherence and to determine whether the locally modified intervention affected expected patient medication adherence outcomes in community pharmacies.

Pharmacists at 4 pharmacies were trained to provide a brief MI intervention to 50 patients per pharmacy who were nonadherent to antihypertensive medications. The training included a 3-hour online course in MI and in-pharmacy training on patient identification and documentation. Semistructured interviews were conducted to determine modifications to the patient identification processes, MI interventions, and documentation of interventions. Directed content analysis was guided by the Stirman and colleagues' framework. Preintervention and 6 months postintervention adherence rates for the patients who received the intervention were calculated. Paired samples t tests were used to assess the impact of the intervention on adherence rates.

Modifications were made to the context of the intervention (e.g., via telephone instead of in-pharmacy). Additionally, content modifications included "loosening the structure" (e.g., reordering intervention steps), "drifting or departing" (e.g., too busy to attempt), "adding elements" (e.g., reminder cards), and "repeating elements" (e.g., patient identification). There were statistically significant improvements in adherence from preintervention to 6 months postintervention (74.1% to 84.5%; P < 0.05) at each pharmacy regardless of the modifications applied.

Modifications made during intervention implementation were classified using Stirman and colleagues' framework. Despite the modifications, adherence rates improved and were consistent with expectations based on prior studies of similar interventions. These findings support previous implementation research on adaptability and suggest that the ability to tailor, modify, or refine an intervention to meet the needs of the provider or setting may allow for intervention success. Future research on the impact of specific modifications will help determine which are detrimental or beneficial to patient outcomes and sustainability of services.