Review: Evidence on the effectiveness of interventions to assist patient adherence to prescribed medications is limitedPDF
ACP J Club. 2002 Jul-Aug;139:19. doi:10.7326/ACPJC-2003-139-1-019
Clinical Impact Ratings
McDonald HP, Garg AX, Haynes RB. Interventions to enhance patient adherence to medication prescriptions: scientific review. JAMA. 2002;288:2868-79. [PubMed ID: 12472329]
In nonaddicted patients with medical or mental disorders, are interventions designed to assist adherence to self-administered prescribed medications effective?
Studies were identified by searching MEDLINE, CINAHL, PsycLIT, SOCIOFILE, IPA, EMBASE/Excerpta Medica, and the Cochrane Library (all from 1967 to August 2001). Bibliographies of relevant articles were reviewed, and authors of included studies were contacted for additional trials.
Studies were selected if they were unconfounded randomized controlled trials (RCTs) of interventions to improve adherence with self-administered prescribed medications for a medical or psychiatric disorder, measured both medication adherence and treatment outcome, had ≥ 80% follow-up of each group studied, and the duration of follow-up for studies with positive initial findings was ≥ 6 months.
Data were extracted on sample size, details of intervention strategies for adherence, details of treatment for the underlying medical or mental disorder, study quality, and outcomes (adherence rates and patient outcomes).
33 RCTs met the selection criteria. These trials evaluated 39 unconfounded interventions. Adherence interventions were tested alone and in combination, with common themes such as more instruction for patients (oral and written material and programmed learning); increased communication and counseling (e.g., compliance therapy and family intervention); increased convenience of care (e.g., provision at the worksite and simplified dosing); more involvement of patients in their care through self-monitoring of disease status; reminders (e.g., reminder pill packaging); and reinforcement or rewards for both improved adherence and treatment response (e.g., reduced frequency of visits and partial payment for blood pressure monitoring equipment). Conditions studied included hypertension (8 RCTs); schizophrenia or acute psychosis (8 RCTs); asthma, chronic obstructive pulmonary disease, or both (5 RCTs); depression (2 RCTs); human immunodeficiency virus (2 RCTs); diabetes (2 RCTs); rheumatoid arthritis (1 RCT); epilepsy (1 RCT); and hyperlipidemia and cardiovascular disease (1 RCT).
49% of interventions tested were associated with statistically significant increases in medication adherence, and 44% reported statistically significant improvements in treatment outcome. Adherence interventions that were effective were complex, including combinations of more convenient care, information, counseling, reminders, self-monitoring, reinforcement, family therapy, and other forms of additional supervision or attention. Simple interventions that showed some success included simplified dosing regimens for those taking antihypertensive and lipid-lowering medications and counseling about the importance of full adherence to antibiotic regimens reinforced by written instructions.
In patients with medical or mental disorders, limited evidence suggests that several interventions designed to assist patients’ adherence to prescribed medications may be effective.
Sources of funding: Population Health Information Project; Canadian Institutes of Health Research; Kidney Foundation of Canada.
For correspondence: Dr. R.B. Haynes, McMaster University Medical Centre, Hamilton, Ontario, Canada. E-mail email@example.com.
Health care providers tend to see their job as making decisions about care and the patient’s job as carrying them out. Yet, those of us who have been prescribed daily medications have found it very difficult to comply with fitting them into our daily routines, especially for asymptomatic conditions. This difficulty is exacerbated by the increasing complexity of treatment regimens resulting from controlled trials (where there is usually great effort to maximize drug adherence), which continue to show us additional drugs that improve outcomes and those drugs are subsequently recommended for routine use. For example, 20 years ago drug therapy for heart failure consisted of digitalis and diuretics. Now, managing this condition takes 4 to 5 drugs, guided by a complex algorithm (1). No wonder compliance is so difficult for both physicians and their patients.
The good news from the systematic review by McDonald and colleagues is that several interventions, many of which are relatively easy to invoke, can increase patient adherence to drug regimens. The bad news is that it often takes efforts by several people to effect this adherence. And worse, neither private nor public insurance pays for these extra efforts. However, many of the interventions aimed at improving quality of care and patient safety (2) can also be used to enhance medication adherence. If a commitment exists to enhance drug adherence as part of good prescribing, then everyone involved in providing care (e.g., physicians, nurses, pharmacists, mental health counselors, and administrators and technologists who design and maintain health care systems) should take a good, long look at the review by McDonald and colleagues to see where they can contribute.
William M. Tierney, MD
Indiana University School of Medicine
Regenstrief Institute for Health CareIndianapolis, Indiana, USA
1. Hunt SA, Baker DW, Chin MH, et al. ACC/AHA Guidelines for the Evaluation and Management of Chronic Heart Failure in the Adult: Executive Summary A Report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines (Committee to Revise the 1995 Guidelines for the Evaluation and Management of Heart Failure): Developed in Collaboration With the International Society for Heart and Lung Transplantation; Endorsed by the Heart Failure Society of America. Circulation. 2001;104:2996-3007. [PubMed ID: 11739319]
2. Institute of Medicine (U.S.). Committee on Quality of Health Care in America. Crossing the quality chasm: a new health system for the 21st century/Committee on Quality Health Care in America, Institute of Medicine. Washington, DC: National Academy Press; 2001. www.nap.edu/books/0309072808/html/.