Prevalence of medication therapy adherence in the elderly and related factors

Prevalence and predictors of medication non-adherence among older community-dwelling people with chronic disease in Singapore

AIMS

To determine the prevalence and predictors of medication non-adherence among older community-dwelling people with at least one chronic disease in Singapore.

DESIGN

A single-centre cross-sectional study.

METHODS

The study was conducted in the largest tertiary public hospital in Singapore between May 2019 and December 2019. The community nurses of the hospital recruited a total of 400 community-dwelling older people aged ≥60 years old, who were diagnosed with at least one chronic disease and prescribed with at least one long-term medication. Medication non-adherence was assessed using the self-report 5-item Medication Adherence Report Scale, operationalized as a score of <25. A list of potential factors of medication non-adherence was structured based on the World Health Organization five-domain framework and collected using a self-report questionnaire.

RESULTS

Sixty percent (n = 240) of our participants were non-adherent to their medication regime. Older people who smoked (OR 2.89, 95% CI 1.14-7.33), perceived their medication regime as being complicated (OR 2.54, 95% CI 1.26-5.13), felt dissatisfied with their regime (OR 2.50, 95% CI 1.17-5.31), did not know the purpose of all their medications (OR 2.56, 95% CI 1.42-4.63) and experienced side effects (OR 3.32, 95% CI 1.14-9.67) were found to be predictive of medication non-adherence.

CONCLUSION

Medication adherence was found to be poor in community-dwelling older people in Singapore. The predictors identified in this study can help guide healthcare professionals in identifying older people who are at risk of medication non-adherence and inform the development of interventions to improve adherence.

IMPACT

Medication non-adherence, especially in the older population with chronic diseases, constitutes a serious problem as it undermines the efforts to reduce morbidity and mortality associated with the underlying chronic diseases. To improve adherence, our findings propose the importance of assessing the older person's treatment satisfaction, which includes examining the aspects of side effects, effectiveness and convenience. Additionally, we highlight the need to address the older person's medication knowledge deficit.

Gender Based Cognitive Determinants Of Medication Adherence In Older Adults With Chronic Conditions

BACKGROUND

Life course gender-role traits and social stereotypes could affect the pattern of medication adherence in old age.

OBJECTIVES

The main purpose of this study was to investigate gender based cognitive determinants of medication adherence in a sample of older adults who suffer from at least a chronic condition.

METHODS

In this cross-sectional design, 455 older adults participated from five health centers in Tabriz city, Iran from June to August 2017 using a random sampling method. Next, required data about medication adherence, knowledge and beliefs about prescribed medications, perceived self-efficacy in medication adherence, illness perception, and reasons for medication non-adherence were gathered using a structured written questionnaire through face-to-face interviews with the attendees.

RESULTS

Low medication adherence was reported by 54.5% of the study participants. Perceived self-efficacy for medication adherence (OR = 1.04; 95% CI: 1.00, 1.08) and medication adherence reason (OR = 0.96; 95% CI: 0.92, 0.99) were two identified strong predictors of medication adherence among the studied older men. Illness perception (OR = 1.02; 95% CI: 1.00, 1.02) and beliefs toward prescribed medication (OR = 0.95; 95% CI: 0.93, 0.98) were both recognized as the significant predictors of medication adherence in the older women subgroup.

CONCLUSION

Gender based variations were noted regarding the medication adherence in the studied sample and attributes of cognitive function were the main pinpointed elucidating parameters for the non-conformity. The explicit cognitive processes must be considered in care provision or interventional programs that target medication adherence in older adults.

Measuring medication adherence in older community-dwelling patients with multimorbidity

PURPOSE

Older people with several chronic conditions require multiple drugs from different classes to be adequately treated. This study aims to: (i) measure medication adherence across multiple conditions and therapeutic drug groups in older community-dwelling patients, and (ii) examine the effect of multimorbidity on adherence.

METHODS

This is a retrospective cohort study of medication adherence in 855 community-dwelling patients aged ≥ 70 years from 15 practices in Ireland using the Health Service Executive Primary Care Reimbursement Service (HSE-PCRS) pharmacy claims database. Multimorbidity was measured using the RxRisk-V and by the number of different drug classes. The RxRisk-V algorithm classifies prescription drug fills into 45 chronic disease classes for older populations based on the WHO Anatomical Therapeutic Chemical classification system. Adherence to medications was assessed by: (i) calculating the average medication possession ratio (MPR) per patient and (ii) an MPR< 80%.

RESULTS

The overall median MPR for the cohort was 0.83 (IQR 0.69, 0.91). The conditions with the highest MPRs were hypothyroidism (mean MPR = 0.88, SD = 0.20) and type 2 diabetes (mean MPR = 0.83, SD = 0.19), followed by heart disease. On average, 20-40% of patients were non-adherent (MPR < 80%) across all conditions. There was an inverted U-shaped relationship between the mean MPR and number of morbidities and drug classes. Adherence varied per patients' morbidity burden, with higher adherence for certain combinations of chronic conditions.

CONCLUSION

In total, 31% of older patients with multimorbidity were non-adherent to their medication but adherence levels varied across treatment categories and chronic conditions.