Adherence to Medical Advice

Adherence (also called compliance) is the extent to which a patient's behaviour matches the advice given by a health practitioner — taking medication correctly, following lifestyle changes, and attending appointments.

Why it matters. Non-adherence is very common (often around half of patients with chronic conditions don't fully adhere) and is harmful and costly:

• treatments don't work as intended, so health worsens (e.g. uncontrolled diabetes, drug-resistant infections from unfinished antibiotics),
• it wastes medicines and money, and increases hospital admissions.

'Adherence' vs 'compliance'. Modern health psychology prefers adherence to compliance because 'compliance' implies the patient should simply obey the (doctor-centred) practitioner, whereas 'adherence' recognises the patient as an active partner who agrees to a plan — linking back to the [[patient-practitioner-relationship]].

Why this matters for the exam. Hold the idea that non-adherence is common, harmful and often rational: it frames why we measure it, why patients don't comply, and why improving adherence is a major goal of health psychology.

Rational non-adherence (Bulpitt). Patients weigh up the costs and benefits of treatment and may rationally decide not to adhere. Costs include side effects (e.g. blood-pressure drugs reducing quality of life), inconvenience, expense and stigma; if these outweigh the perceived benefit (especially when the patient feels fine), non-adherence is a reasoned decision, not stupidity.

Other reasons:

• Forgetting (especially with multiple medicines or busy lives).
• Not understanding the instructions (poor communication; see [[patient-practitioner-relationship]]).
• Complex regimens — many pills, multiple times a day.
• Feeling better — stopping antibiotics early once symptoms ease.
• Beliefs about illness/medicine (e.g. fear of dependence) and denial.

Evaluation in brief. The rational model is powerful — it reframes non-adherence as understandable and points to solutions (reduce costs/side effects). But it can overstate how rational patients are (much non-adherence is accidental, e.g. forgetting), and the reasons interact and are hard to measure.

You cannot improve adherence without measuring it — and each method has trade-offs.

Subjective methods:

• Self-report / questionnaires / interviews — ask the patient (or practitioner) how well they adhered.
  • + Cheap, easy, can explore reasons. − Over-report adherence (social desirability), poor recall — low validity.

Objective methods:

• Pill counting — count returned/remaining pills.
  • + Simple, objective. − Doesn't prove the pills were taken (could be discarded), can be 'dumped' before a visit.
• Biochemical tests — blood/urine tests for the drug or a marker.
  • + Hard to fake. − Invasive, expensive; affected by metabolism; only shows recent use.
• Medication event monitoring systems (MEMS / TrackCap) — an electronic pill-bottle cap that records the date and time the container is opened. Chung & Naya used a TrackCap to monitor asthma medication, finding electronic monitoring revealed lower real adherence than self-report suggested.
  • + Detailed, objective, time-stamped. − Opening ≠ taking; expensive; the device itself may change behaviour.

Evaluation in brief. Objective methods are more valid than self-report but still imperfect (none proves the drug was actually swallowed), and the best approach often combines methods.

Behavioural strategies:

• Simplify the regimen (fewer pills, once a day, combination pills).
• Reminders/prompts — alarms, apps, text messages, pill organisers, linking pills to daily routines.
• Reinforcement — rewards/feedback for adherence, especially with children.
• The 'funhaler' (Watt et al., 2003). A modified asthma spacer/inhaler for children with incentive toys (a spinner and whistle that work only with correct breathing). Children using the funhaler were more likely to use it and used better technique than with a standard inhaler — using positive reinforcement/fun to boost adherence.

Communication strategies:

• Improve practitioner communication (clear instructions, checking understanding/teach-back) — see [[patient-practitioner-relationship]].
• Explain the benefits and address concerns/side effects to reduce rational non-adherence.

Customising/structural:

• Tailor treatment to the patient's life; involve them in decisions (a patient-centred approach increases 'buy-in').

Evaluation in brief. These strategies are practical and effective, especially behavioural ones, but effects can be short-lived without ongoing support, some require resources, and what works depends on why the patient is non-adherent (intentional vs accidental).

Bring it together for Paper 3 'evaluate / discuss'.

Strengths

• Strong real-world application — improving adherence improves health and cuts costs.
• Use of increasingly objective measures (biochemical, electronic monitoring).

Weaknesses / issues

• Measurement validity — even objective methods don't prove the drug was taken; self-report is biased.
• Ethics — monitoring patients (e.g. electronic caps) raises privacy/consent; rewarding adherence can feel controlling.
• Individual differences — reasons for non-adherence vary, so one solution won't fit all.

Relevant issues & debates

• Application to everyday life (the central strength).
• Free will vs determinism — rational non-adherence stresses the patient's choice, vs behavioural prompts that shape behaviour.
• Idiographic vs nomothetic — tailoring to the individual vs general adherence rules.
• Use of quantitative vs qualitative data (counts/tests vs reasons).