Patient compliance is a component of health behavior.
Prevalence and epidemiology
"Primary nonadherence is common and may be reduced by lower drug costs and copayments, as well as increased follow-up care with prescribing physicians for patients with chronic conditions.". 
Among patients who have to take numerous drugs for their health (polypharmacy), not taking all of their medications may lead to poorer health outcomes.
23% of patients report skipping doses or cutting pills in half to make their supply last longer according to one survey. This is more common among low-income patients.
- Half of the patients stopped taking a medicine completely (non-persistence)
- 43% of patients took drug holidays in which they did not take a medication for three days or more (non-execution)
Patients are more likely to abandon prescriptions that are expensive.
How to detect noncompliance
Methods to improve compliance
|Doses per day|| % of days in|
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