Medicine
Health Literacy and Medication Adherence
Quick fact
Adults with low health literacy are about twice as likely to misunderstand medication instructions and nearly three times more likely to experience adverse drug events, compared to those with adequate health literacy.
Why this is interesting
You've probably taken a prescription home and wondered: 'When exactly do I take this?' Now imagine you can't read the label clearly. How would that affect your health?
Read the full explanation
Understanding Health Literacy and Medication Adherence
Health literacy is more than just reading ability; it's the capacity to obtain, process, and understand basic health information to make informed decisions. When patients have low health literacy, they may struggle to comprehend dosing schedules, warnings, and the importance of completing a full course of medication. For example, they might not know that 'take twice daily' means every 12 hours, or they may stop taking antibiotics when they feel better, not realizing they need to finish the course to prevent resistance. This leads to poor adherence—intentional or unintentional—resulting in suboptimal disease control, increased complications, and higher healthcare costs. The effect is particularly pronounced in chronic conditions like diabetes, hypertension, and asthma, where consistent medication is key.
A deeper explanation
The mechanism linking health literacy to adherence is multi-step. First, patients must read and interpret labels (print literacy). Second, they need numeracy to understand quantities and timing (e.g., 'take 1.5 tablets' or 'reduce dose after 2 weeks'). Third, they must filter out conflicting information from various sources. When any of these steps fail, adherence drops. For instance, a patient with low numeracy may incorrectly measure liquid medication, leading to under- or overdosing. Low health literacy also reduces the ability to ask questions or understand provider explanations, but even more directly, it affects memory and planning—patients may not remember the instructions correctly. To improve outcomes, healthcare systems can adopt universal precautions: simplify labels, use pictograms, and employ teach-back techniques to confirm understanding. Addressing health literacy is therefore a critical lever for improving medication adherence and, ultimately, patient outcomes.