Background Adverse reactions to warfarin may be serious and can lead to hospitalisation or death. Minimising the risk of adverse drug reactions through the intervention of community pharmacists is important for patients receiving warfarin, especially for elderly (≥ 65 years) patients living in rural areas. Objective To evaluate the impact of an intervention by community pharmacists on the risk of adverse drug reactions in elderly rural patients receiving warfarin. Setting: A community pharmacy in a rural area of Croatia. Method We conducted a prospective randomised trial. Eligible patients were recruited at the pharmacy and randomised into one of two groups. The participants were followed up every month for 6 months. Main outcome measure: The incidence and type of adverse drug reactions caused by warfarin and the time-to-event. Results In total, 140 patients were randomized and 131 patients completed the study; 65 patients were in the intervention group. The median age of patients was 73 years of age. The cumulative incidence of adverse drug reactions was significantly lower in the intervention group (6-months rate 29% vs. 85% for intervention and control, respectively; hazard ratio = 0.17, p < 0.001) than in the control group. Factors multivariately associated with the development of adverse drug reactions related to warfarin (p < 0.05) were the absence of pharmaceutical intervention, higher time in therapeutic range, change of warfarin dose, changes in dietary vitamin K intake, and marital status other than married. Conclusion Overall, the pharmacist's intervention significantly prolonged the time to occurrence of adverse drug reactions and reduced their incidence.
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