Nudging for Anticoagulation Adherence in Atrial Fibrillation

The goal of this clinical trial is to learn if a nudging intervention (using text message reminders, a medication calendar, and action planning) can help people with atrial fibrillation take their blood-thinning medication (anticoagulants) as prescribed. The main questions it aims to answer are: Does the nudging intervention improve medication adherence compared to usual care? How does the intervention affect patients' beliefs about their medication and the automaticity of pill-taking? Is the intervention cost-effective? Researchers will compare participants who receive the nudging intervention with those who receive usual care. Participants will: Watch a short educational video about atrial fibrillation and stroke prevention Make a personal plan to take their medication at the same time each day (for example, after breakfast) Receive text message reminders 1 to 3 times per week, with fewer messages over time Get a medication calendar to track daily doses Answer a few questionnaires at the start, at 8 weeks, and at 12 weeks

Inclusion Criteria: * Age ≥18 years Diagnosed with non-valvular atrial fibrillation (AF) confirmed by medical records Prescribed oral anticoagulants (e.g., warfarin, rivaroxaban, apixaban, dabigatran, edoxaban) for at least 3 months Own a personal mobile phone capable of receiving SMS messages Willing and able to provide written informed consent Exclusion Criteria: * Severe cognitive impairment or psychiatric disorder that would preclude completion of questionnaires or adherence to the intervention Life expectancy \