What is a common ethical concern about Phase I clinical trials?

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In Phase I trials, the ethical concern that stands out is avoiding undue influence on participants who may have limited alternatives. These early studies often expose volunteers to unknown or uncertain risks with little or no direct therapeutic benefit. When financial or other incentives are offered, there’s a real risk that individuals might downplay or misunderstand the potential harms to participate just to receive the compensation. Ensuring that informed consent is truly voluntary and that participants understand the risks without feeling pressured is the central ethical challenge in this context.

Double-blind methods are a study design choice, not inherently an ethical issue, and not all Phase I trials are blinded. IRB oversight is required, and compensation should be appropriate rather than coercive, but the core ethical focus remains on protecting participants from undue influence and ensuring truly informed, voluntary participation.