Concepts in Risk-Benefit Assessment
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The term ‘benefit-risk ratio’ is often used as a general term linked to the use of a medicine. To balance risk and benefit is, however, a very complex exercise. For most medicines the benefits are limited to a few indications and for an individual patient there is usually only a single benefit sought but the potential risks are multiple.
Perceptions of risks versus benefits are influenced to a great extent by the context in which they occur. Thus, perception of risk may be different to actual risk. In the end in any given situation, the acceptable risk-to-benefit balance is an individual judgement on the part of the patient or the prescriber.
For newer medicines, where there is likely to be limited experience, conser-vative estimates of the overall merit seem preferable so that the prescriber will use the drug critically. Subsequently, re-evaluation of the risk-to-benefit balance is necessary as greater knowledge of efficacy and adverse effects is acquired.
It is possible to provide a general ‘principle of threes’ structure for a merit assessment based upon the concepts of seriousness, duration and incidence as related to disease indication, disease amelioration by a medicine, and the adverse effects ascribed to the medicine. This allows a rapid first comparison of medicines for a given indication.
In using this general conceptual model in a transparent fashion for a given hypothesis and context, it is possible to identify the essential data used and assumptions involved that make up a merit statement. The quality and value, particularly of risk data, is problematic. Risk perception is an issue that needs to be clearly identified alongside a merit analysis. A simple merit assessment should pave the way for more focused studies.
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