Prevalence and predictors of inadequate patient medication knowledge

Wiley: 12 months
Publication Type:
Journal Article
Journal of Evaluation in Clinical Practice, 2016, 22 pp. 808 - 815
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Objectives To assess medication knowledge in adult patients and to explore its determi-nants.Method Cross-sectional study. Medication knowledge was the primary outcome and wasassessed using a previously validated questionnaire. A multivariate logistic regression anal-ysis was performed to explore the association between medication knowledge and thefactors included in the model.Results Seven thousand two hundred seventy-eight patients participated in the study.71.9% (n = 5234) (95% CI: 70.9%–73.0%) of the surveyed patients had an inadequateknowledge of the medication they were taking. The dimensions obtaining the highest levelof knowledge were the ‘medication use process’ and ‘therapeutic objective of medication’.The items ‘frequency’ (75.4%), ‘dosage’ (74.5%) and ‘indication’ (70.5%) had the highestpercentage of knowledge. Conversely, ‘medication safety’ represented the dimension withthe lowest scores, ranging from 12.6% in the item “contraindications” to 15.3% in the item‘side effects’. The odds ratio (OR) of having an inadequate medication knowledge in-creased for unskilled workers (OR: 1.33; 85% CI:1.00–1.78; P = 0.050), caregivers(OR:1.46; 95% CI:1.18–1.81; P < 0.001), patients using more than one medication (OR:1.14; 95% CI: 1.00–1.31; P = 0.050) and patients who did not know the name of the med-ication they were taking (OR: 2.14, 95% CI: 1.71–2.68 P < 0.001).Conclusion Nearly three quarters of the analysed patients had inadequate knowledgeregarding the medicines they were taking. Unskilled workers and caregivers were at ahigher risk of lacking of medication knowledge. Other factors that correlated with inade-quate medication knowledge were the use of more than one drug and not knowing the nameof the medication dispensed.
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