A ll Canadian residents are insured for medically necessary hospital care and physician services, without out-of-pocket charges at the point of care. However, this insurance excludes prescription drugs used outside of hospitals. Although many Canadians have some form of prescription drug insurance through work-related benefits or public programs, others lack any drug coverage. 1 In addition, Canadians with prescription drug insurance still often have to bear some or all of the costs of their drugs owing to insurance plan deductibles, copayments and gaps in insurance whereby some drugs are not covered. 1,2 The out-of-pocket pharmaceutical costs borne by uninsured or underinsured Canadians can be substantial and tend to disproportionately affect potentially vulnerable populations, 3-6 including children, older people, ethnic minorities and those who are socioeconomically disadvantaged. 7,8 The consequences of high out-ofpocket costs vary. Patients have reported engaging in compensatory behaviours including cost-related nonadherence to prescription medications, 6,9,10 which affects about 8% of Canadians with a drug prescription. 11-14 Patients also make trade-offs against spending in other areas of the household budget to be able to afford prescription drugs. 6,9,15-17 Patients have also reported borrowing money, including increasing credit card debt, to compensate for high drug costs and borrowing money from family and friends as a way to cope with high health care costs. 10,18-21 However, most of this evidence is from the United States, which has a markedly different health insurance system and different levels of out-of-pocket