Enhancing Therapy Adherence: Impact on Clinical Outcomes, Healthcare Costs, and Patient Quality of Life
Abstract
:1. Background
2. Adherence and Challenges
- 1.
- Patient-Related Factors: Patients’ beliefs, knowledge, and psychological factors significantly influence adherence. For example, low health literacy and poor understanding of the disease and its treatment can lead to the incorrect use of medication [25]. Mental health conditions such as depression and anxiety are also associated with low adherence, particularly in patients with chronic illnesses [14,19].
- 2.
- Therapy-Related Factors: The complexity of treatment regimens, including the frequency and number of medications, plays a significant role in adherence. Polypharmacy, common among elderly patients, increases the risk of medication errors and reduces adherence [26]. Additionally, side effects, particularly in long-term treatments, can discourage patients from continuing therapy as prescribed.
- 3.
- Healthcare-System-Related Factors: Healthcare system barriers include limited access to care, inadequate patient–provider communication, and insufficient follow-up mechanisms. The quality of the patient–provider relationship is crucial, as poor communication and lack of trust can undermine adherence [27,28]. Moreover, structural barriers such as high out-of-pocket costs and limited access to medications in certain regions further exacerbate non-adherence.
- 4.
- Socioeconomic Factors: Socioeconomic status is one of the most significant predictors of adherence. Patients with lower income levels often struggle with the cost of medications, which can lead to rationing or skipping doses [10]. In addition, social support networks, or the lack thereof, can either encourage or hinder adherence behaviors.
3. Adherence and Clinical Outcomes
4. Adherence and Therapy Costs
5. Adherence and Patient Quality of Life
6. Strategies to Improve Therapy Adherence: The Role of Healthcare Professionals and Technological Innovations
7. Conclusions
8. Future Directions
Author Contributions
Funding
Conflicts of Interest
References
- World Health Organization. Adherence to Long-Term Therapies; WHO: Geneva, Switzerland, 2003. [Google Scholar]
- Brown, M.T.; Bussell, J.K. Medication adherence: WHO cares? Mayo Clin. Proc. 2011, 86, 304–314. [Google Scholar] [CrossRef] [PubMed]
- Vrijens, B.; De Geest, S.; Hughes, D.A.; Przemyslaw, K.; Demonceau, J.; Ruppar, T.; Dobbels, F.; Fargher, E.; Morrison, V.; Lewek, P.; et al. A new taxonomy for describing and defining adherence to medications. Br. J. Clin. Pharmacol. 2012, 73, 691–705. [Google Scholar] [CrossRef] [PubMed]
- Chong, B.; Jayabaskaran, J.; Jauhari, S.M.; Chan, S.P.; Goh, R.; Kueh, M.T.W.; Li, H.; Chin, Y.H.; Kong, G.; Anand, V.V.; et al. Global burden of cardiovascular diseases: Projections from 2025 to 2050. Eur. J. Prev. Cardiol. 2024, zwae281. [Google Scholar] [CrossRef] [PubMed]
- NCD Risk Factor Collaboration (NCD-RisC). Worldwide trends in hypertension prevalence and progress in treatment and control from 1990 to 2019: A pooled analysis of 1201 population-representative studies with 104 million participants. Lancet 2021, 398, 957–980. [Google Scholar] [CrossRef]
- GBD 2021 Diabetes Collaborators. Global, regional, and national burden of diabetes from 1990 to 2021, with projections of prevalence to 2050: A systematic analysis for the Global Burden of Disease Study 2021. Lancet 2023, 402, 203–234. [Google Scholar] [CrossRef]
- Cordioli, M.; Corbetta, A.; Kariis, H.M.; Jukarainen, S.; Vartiainen, P.; Kiiskinen, T.; Ferro, M.; FinnGen; Estonian Biobank Research Team; Perola, M.; et al. Socio-demographic and genetic risk factors for drug adherence and persistence across 5 common medication classes. Nat. Commun. 2024, 15, 9156. [Google Scholar] [CrossRef]
- Cheen, M.H.H.; Tan, Y.Z.; Oh, L.F.; Wee, H.L.; Thumboo, J. Prevalence of and factors associated with primary medication non-adherence in chronic disease: A systematic review and meta-analysis. Int. J. Clin. Pract. 2019, 73, e13350. [Google Scholar] [CrossRef]
- Lee, E.K.P.; Poon, P.; Yip, B.H.K.; Bo, Y.; Zhu, M.T.; Yu, C.P.; Ngai, A.C.H.; Wong, M.C.S.; Wong, S.Y.S. Global burden, regional differences, trends, and health consequences of medication nonadherence for hypertension during 2010 to 2020: A meta-analysis involving 27 million patients. J. Am. Heart Assoc. 2022, 11, e026582. [Google Scholar] [CrossRef]
- Cutler, R.L.; Fernandez-Llimos, F.; Frommer, M.; Benrimoj, C.; Garcia-Cardenas, V. Economic impact of medication non-adherence by disease groups: A systematic review. BMJ Open 2018, 8, e016982. [Google Scholar] [CrossRef]
- Iuga, A.O.; McGuire, M.J. Adherence and health care costs. Risk Manag. Healthc. Policy 2014, 7, 35–44. [Google Scholar]
- Khan, R.; Socha-Dietrich, K. Investing in Medication Adherence Improves Health Outcomes and Health System Efficiency: Adherence to Medicines for Diabetes, Hypertension, and Hyperlipidaemia; OECD Health Working Papers; OECD: Paris, France, 2018; p. 105. [Google Scholar]
- Maffoni, M.; Traversoni, S.; Costa, E.; Midão, L.; Kardas, P.; Kurczewska-Michalak, M.; Giardini, A. Medication adherence in the older adults with chronic multimorbidity: A systematic review of qualitative studies on patient’s experience. Eur. Geriatr. Med. 2020, 11, 369–381. [Google Scholar] [CrossRef] [PubMed]
- Hyvert, S.; Yailian, A.L.; Haesebaert, J.; Vignot, E.; Chapurlat, R.; Dussart, C.; De Freminville, H.; Janoly-Dumenil, A. Association between health literacy and medication adherence in chronic diseases: A recent systematic review. Int. J. Clin. Pharm. 2023, 45, 38–51. [Google Scholar] [CrossRef]
- Nguyen, T.M.; La Caze, A.; Cottrell, N. What are validated self-report adherence scales really measuring?: A systematic review. Br. J. Clin. Pharmacol. 2014, 77, 427–445. [Google Scholar] [CrossRef] [PubMed]
- Gackowski, M.; Jasińska-Stroschein, M.; Osmałek, T.; Waszyk-Nowaczyk, M. Innovative approaches to enhance and measure medication adherence in chronic disease management: A review. Med. Sci. Monit. 2024, 30, e944605. [Google Scholar] [CrossRef]
- Kardas, P.; Lewek, P.; Matyjaszczyk, M. Determinants of patient adherence: A review of systematic reviews. Front. Pharmacol. 2013, 4, 91. [Google Scholar] [CrossRef]
- Oliveira, H.C.; Hayashi, D.; Carvalho, S.D.L.; Barros, R.C.L.; Neves, M.L.D.S.; Andrechuk, C.R.S.; Alexandre, N.M.C.; Ribeiro, P.A.B.; Rodrigues, R.C.M. Quality of measurement properties of medication adherence instruments in cardiovascular diseases and type 2 diabetes mellitus: A systematic review and meta-analysis. Syst. Rev. 2023, 12, 222. [Google Scholar] [CrossRef]
- Morowatisharifabad, M.A.; Movahed, E.; Farokhzadian, J.; Nikooie, R.; Askarishahi, M.; Bidaki, R.; Hosseinzadeh, M. Antiretroviral therapy adherence based on information, motivation, and behavioral skills model and its association with depression among HIV-positive patients: Health promotion strategy towards the 909090 target. J. Educ. Health Promot. 2019, 8, 192. [Google Scholar]
- Gimeno, E.J.; Bøgelund, M.; Larsen, S.; Okkels, A.; Reitzel, S.B.; Ren, H.; Orozco-Beltran, D. Adherence and persistence to basal insulin among people with type 2 diabetes in Europe: A systematic literature review and meta-analysis. Diabetes Ther. 2024, 15, 1047–1067. [Google Scholar] [CrossRef]
- McKenzie, S.J.; McLaughlin, D.; Clark, J.; Doi, S.A. The burden of non-adherence to cardiovascular medications among the aging population in Australia: A meta-analysis. Drugs Aging 2015, 32, 217–225. [Google Scholar] [CrossRef]
- Nielsen, J.Ø.; Shrestha, A.D.; Neupane, D.; Kallestrup, P. Non-adherence to anti-hypertensive medication in low- and middle-income countries: A systematic review and meta-analysis of 92,443 subjects. J. Hum. Hypertens. 2017, 31, 14–21. [Google Scholar] [CrossRef]
- Venditti, V.; Bleve, E.; Morano, S.; Filardi, T. Gender-Related Factors in Medication Adherence for Metabolic and Cardiovascular Health. Metabolites 2023, 13, 1087. [Google Scholar] [CrossRef] [PubMed]
- DiMatteo, M.R.; Haskard-Zolnierek, K.B.; Martin, L.R. Improving patient adherence: A three-factor model to guide practice. Health Psychol. Rev. 2012, 6, 74–79. [Google Scholar] [CrossRef]
- Ricke, E.; Dijkstra, A.; Bakker, E.W. Prognostic factors of adherence to home-based exercise therapy in patients with chronic diseases: A systematic review and meta-analysis. Front. Sports Act. Living 2023, 5, 1035023. [Google Scholar] [CrossRef] [PubMed]
- Turgeon, J.; Michaud, V.; Steffen, L. The dangers of polypharmacy in elderly patients. JAMA Intern. Med. 2017, 177, 1544. [Google Scholar] [CrossRef] [PubMed]
- Bayatra, A.; Nasserat, R.; Ilan, Y. Overcoming low adherence to chronic medications by improving their effectiveness using a personalized second-generation digital system. Curr. Pharm. Biotechnol. 2024, 25, 2078–2088. [Google Scholar] [CrossRef]
- Ahmed, I.; Ahmad, N.S.; Ali, S.; Ali, S.; George, A.; Saleem Danish, H.; Uppal, E.; Soo, J.; Mobasheri, M.H.; King, D.; et al. Medication adherence apps: Review and content analysis. JMIR Mhealth Uhealth 2018, 6, e62. [Google Scholar] [CrossRef]
- Evans, M.; Engberg, S.; Faurby, M.; Fernandes, J.D.D.R.; Hudson, P.; Polonsky, W. Adherence to and persistence with antidiabetic medications and associations with clinical and economic outcomes in people with type 2 diabetes mellitus: A systematic literature review. Diabetes Obes. Metab. 2022, 24, 377–390. [Google Scholar] [CrossRef]
- Denicolò, S.; Perco, P.; Thöni, S.; Mayer, G. Non-adherence to antidiabetic and cardiovascular drugs in type 2 diabetes mellitus and its association with renal and cardiovascular outcomes: A narrative review. J. Diabetes Complicat. 2021, 35, 107931. [Google Scholar] [CrossRef]
- Piragine, E.; Petri, D.; Martelli, A.; Calderone, V.; Lucenteforte, E. Adherence to oral antidiabetic drugs in patients with type 2 diabetes: Systematic review and meta-analysis. J. Clin. Med. 2023, 12, 1981. [Google Scholar] [CrossRef]
- Kengne, A.P.; Brière, J.B.; Zhu, L.; Li, J.; Bhatia, M.K.; Atanasov, P.; Khan, Z.M. Impact of poor medication adherence on clinical outcomes and health resource utilization in patients with hypertension and/or dyslipidemia: Systematic review. Expert Rev. Pharmacoecon. Outcomes Res. 2024, 24, 143–154. [Google Scholar] [CrossRef]
- Ihm, S.H.; Kim, K.I.; Lee, K.J.; Won, J.W.; Na, J.O.; Rha, S.W.; Kim, H.L.; Kim, S.H.; Shin, J. Interventions for adherence improvement in the primary prevention of cardiovascular diseases: Expert consensus statement. Korean Circ. J. 2022, 52, 1–33. [Google Scholar] [CrossRef] [PubMed]
- Rupakheti, B.; Kc, B.; Bista, D.; Kc, S.; Pandey, K.R. Treatment adherence and health-related quality of life among patients with hypertension at tertiary healthcare facility in Lalitpur, Nepal: A cross-sectional study. Patient Prefer. Adherence 2024, 18, 2077–2090. [Google Scholar] [CrossRef] [PubMed]
- Jarrah, M.; Khader, Y.; Alkouri, O.; Al-Bashaireh, A.; Alhalaiqa, F.; Al Marzouqi, A.; Qaladi, O.A.; Alharbi, A.; Alshahrani, Y.M.; Alqarni, A.S.; et al. Medication adherence and its influencing factors among patients with heart failure: A cross-sectional study. Medicina 2023, 59, 960. [Google Scholar] [CrossRef]
- Millenaar, D.; Schumacher, H.; Brueckmann, M.; Eikelboom, J.W.; Ezekowitz, M.; Slawik, J.; Ewen, S.; Ukena, C.; Wallentin, L.; Connolly, S.; et al. Cardiovascular outcomes according to polypharmacy and drug adherence in patients with atrial fibrillation on long-term anticoagulation (from the RE-LY Trial). Am. J. Cardiol. 2021, 149, 27–35. [Google Scholar] [CrossRef]
- Burnier, M.; Egan, B.M. Adherence in hypertension. Circ. Res. 2019, 124, 1124–1140. [Google Scholar] [CrossRef]
- Baryakova, T.H.; Pogostin, B.H.; Langer, R.; McHugh, K.J. Overcoming barriers to patient adherence: The case for developing innovative drug delivery systems. Nat. Rev. Drug Discov. 2023, 22, 387–409. [Google Scholar] [CrossRef]
- Elliott, R.A.; Tanajewski, L.; Gkountouras, G.; Avery, A.J.; Barber, N.; Mehta, R.; Boyd, M.J.; Latif, A.; Chuter, A.; Waring, J. Cost-effectiveness of support for people starting a new medication for a long-term condition through community pharmacies: An economic evaluation of the New Medicine Service (NMS) compared with normal practice. Pharmacoeconomics 2017, 35, 1237–1255. [Google Scholar] [CrossRef]
- Fernandez-Lazaro, C.I.; Adams, D.P.; Fernandez-Lazaro, D.; Garcia-González, J.M.; Caballero-Garcia, A.; Miron-Canelo, J.A. Medication adherence and barriers among low-income, uninsured patients with multiple chronic conditions. Res. Soc. Adm. Pharm. 2019, 15, 744–753. [Google Scholar] [CrossRef]
- Bhuyan, S.S.; Shiyanbola, O.; Kedia, S.; Chandak, A.; Wang, Y.; Isehunwa, O.O.; Anunobi, N.; Ebuenyi, I.; Deka, P.; Ahn, S.; et al. Does cost-related medication nonadherence among cardiovascular disease patients vary by gender? Evidence from a nationally representative sample. Womens Health Issues 2017, 27, 108–115. [Google Scholar] [CrossRef]
- Rezaei, S.; Peikanpour, M.; Zarei, L.; Mohammadnezhad, G.; Salamzadeh, J. An adapted model of cost-related medication nonadherence among older adult patients with chronic diseases: An Iranian qualitative study. BMC Geriatr. 2023, 23, 208. [Google Scholar] [CrossRef]
- Lee, S.; Jiang, L.; Dowdy, D.; Hong, Y.A.; Ory, M.G. Attitudes, beliefs, and cost-related medication nonadherence among adults aged 65 or older with chronic diseases. Prev. Chronic Dis. 2018, 15, E148. [Google Scholar] [CrossRef] [PubMed]
- McElfish, P.A.; Long, C.R.; Payakachat, N.; Felix, H.; Bursac, Z.; Rowland, B.; Hudson, J.S.; Narcisse, M.R. Cost-related nonadherence to medication treatment plans: Native Hawaiian and Pacific Islander National Health Interview Survey, 2014. Med. Care 2018, 56, 341–349. [Google Scholar] [CrossRef] [PubMed]
- Souza, A.C.; Borges, J.W.; Moreira, T.M. Quality of life and treatment adherence in hypertensive patients: Systematic review with meta-analysis. Rev. Saude Publica 2016, 50, 71. [Google Scholar] [CrossRef]
- Jansen, E.M.; van de Hei, S.J.; Dierick, B.J.H.; Kerstjens, H.A.M.; Kocks, J.W.H.; van Boven, J.F.M. Global burden of medication non-adherence in chronic obstructive pulmonary disease (COPD) and asthma: A narrative review of the clinical and economic case for smart inhalers. J. Thorac. Dis. 2021, 13, 3846–3864. [Google Scholar] [CrossRef]
- Khan, J.; Khan, J.A.; Kumari, S.; Charan, D. Treatment non-adherence patterns among patients with mental illness: A study from the district mental health care center in India. Cureus 2024, 16, e54495. [Google Scholar] [CrossRef]
- Ameri, M.; Movahed, E.; Farokhzadian, J. Effect of information, motivation, and behavioral skills model on adherence to medication, diet, and physical activity in HIV/ADIS patients: A health promotion strategy. J. Educ. Health Promot. 2020, 9, 317. [Google Scholar]
- Chun-Yun Kang, G. Technology-based interventions to improve adherence to antihypertensive medications—An evidence-based review. Digit. Health 2022, 8, 20552076221089725. [Google Scholar] [CrossRef]
- Peng, Y.; Wang, H.; Fang, Q.; Xie, L.; Shu, L.; Sun, W.; Liu, Q. Effectiveness of mobile applications on medication adherence in adults with chronic diseases: A systematic review and meta-analysis. J. Manag. Care Spec. Pharm. 2020, 26, 550–561. [Google Scholar] [CrossRef]
- Choi, E.P.H. A pilot study to evaluate the acceptability of using a smart pillbox to enhance medication adherence among primary care patients. Int. J. Environ. Res. Public Health 2019, 16, 3964. [Google Scholar] [CrossRef]
- Leiz, M.; Pfeuffer, N.; Rehner, L.; Stentzel, U.; van den Berg, N. Telemedicine as a tool to improve medicine adherence in patients with affective disorders—A systematic literature review. Patient Prefer. Adherence 2022, 16, 3441–3463. [Google Scholar] [CrossRef]
- Elnaem, M.H.; Irwan, N.A.; Abubakar, U.; Syed Sulaiman, S.A.; Elrggal, M.E.; Cheema, E. Impact of medication regimen simplification on medication adherence and clinical outcomes in patients with long-term medical conditions. Patient Prefer. Adherence 2020, 14, 2135–2145. [Google Scholar] [CrossRef] [PubMed]
- Fiorillo, A.; Barlati, S.; Bellomo, A.; Corrivetti, G.; Nicolò, G.; Sampogna, G.; Stanga, V.; Veltro, F.; Maina, G.; Vita, A. The role of shared decision-making in improving adherence to pharmacological treatments in patients with schizophrenia: A clinical review. Ann. Gen. Psychiatry 2020, 19, 43. [Google Scholar] [CrossRef] [PubMed]
- Marcum, Z.A.; Jiang, S.; Bacci, J.L.; Ruppar, T.M. Pharmacist-led interventions to improve medication adherence in older adults: A meta-analysis. J. Am. Geriatr. Soc. 2021, 69, 3301–3311. [Google Scholar] [CrossRef] [PubMed]
- Conn, V.S.; Ruppar, T.M.; Chan, K.C.; Dunbar-Jacob, J.; Pepper, G.A.; De Geest, S. Packaging interventions to increase medication adherence: Systematic review and meta-analysis. Curr. Med. Res. Opin. 2015, 31, 145–160. [Google Scholar] [CrossRef]
- Kim, C.J.; Kim, M.; Lee, G.Y.; Park, E.; Schlenk, E.A. Effectiveness of nurse-led interventions on medication adherence in adults taking medication for metabolic syndrome: A systematic review and meta-analysis. J. Clin. Nurs. 2023, 32, 5328–5356. [Google Scholar] [CrossRef]
- Zanforlini, B.M.; Sambo, S.; Devita, M.; Cignarella, A.; Vezzali, F.; Sturani, S.; Grandieri, A.; Noale, M.; Siviero, P.; Limongi, F.; et al. A multidisciplinary approach to improve adherence to medical recommendations in older adults at hospital discharge: The APPROACH study protocol. PLoS ONE. 2024, 19, e0297238. [Google Scholar] [CrossRef]
- Persaud, N.; Bedard, M.; Boozary, A.S.; Glazier, R.H.; Gomes, T.; Hwang, S.W.; Jüni, P.; Law, M.R.; Mamdani, M.M.; Manns, B.J.; et al. Effect on treatment adherence of distributing essential medicines at no charge: The CLEAN Meds randomized clinical trial. JAMA Intern. Med. 2020, 180, 27–34. [Google Scholar] [CrossRef]
- Farley, J.F. Are the benefits of value-based insurance design conclusive? J. Manag. Care Spec. Pharm. 2019, 25, 736–738. [Google Scholar] [CrossRef]
- Dao, N.; Lee, S.; Hata, M.; Sarino, L. Impact of appointment-based medication synchronization on proportion of days covered for chronic medications. Pharmacy 2018, 6, 44. [Google Scholar] [CrossRef]
Strategy | Description | Benefits |
Patient Education | Counseling and printed/digital materials to improve understanding of therapy. | Increased knowledge, adherence, and HRQoL. |
Digital Health Tools | Mobile apps and electronic devices for reminders and tracking. | Enhanced engagement and better adherence. |
Telemedicine | Virtual consultations and monitoring. | Early intervention and improved outcomes. |
Simplified Regimens | Reducing complexity by prescribing once-daily medications. | Higher adherence and fewer complications. |
Healthcare Professionals’ Involvement | Active involvement in fostering patient trust, providing continuous support, and encouraging adherence. | Improved patient–provider relationship, better adherence, and enhanced outcomes. |
Intervention programs | Structured programs using multidisciplinary teams, financial incentives, and pharmacist-led interventions to improve adherence. | Reduced hospital readmissions, fewer emergency visits, enhanced adherence, and cost savings. |
Disclaimer/Publisher’s Note: The statements, opinions and data contained in all publications are solely those of the individual author(s) and contributor(s) and not of MDPI and/or the editor(s). MDPI and/or the editor(s) disclaim responsibility for any injury to people or property resulting from any ideas, methods, instructions or products referred to in the content. |
© 2025 by the authors. Published by MDPI on behalf of the Lithuanian University of Health Sciences. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Share and Cite
Religioni, U.; Barrios-Rodríguez, R.; Requena, P.; Borowska, M.; Ostrowski, J. Enhancing Therapy Adherence: Impact on Clinical Outcomes, Healthcare Costs, and Patient Quality of Life. Medicina 2025, 61, 153. https://doi.org/10.3390/medicina61010153
Religioni U, Barrios-Rodríguez R, Requena P, Borowska M, Ostrowski J. Enhancing Therapy Adherence: Impact on Clinical Outcomes, Healthcare Costs, and Patient Quality of Life. Medicina. 2025; 61(1):153. https://doi.org/10.3390/medicina61010153
Chicago/Turabian StyleReligioni, Urszula, Rocío Barrios-Rodríguez, Pilar Requena, Mariola Borowska, and Janusz Ostrowski. 2025. "Enhancing Therapy Adherence: Impact on Clinical Outcomes, Healthcare Costs, and Patient Quality of Life" Medicina 61, no. 1: 153. https://doi.org/10.3390/medicina61010153
APA StyleReligioni, U., Barrios-Rodríguez, R., Requena, P., Borowska, M., & Ostrowski, J. (2025). Enhancing Therapy Adherence: Impact on Clinical Outcomes, Healthcare Costs, and Patient Quality of Life. Medicina, 61(1), 153. https://doi.org/10.3390/medicina61010153