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Quantifying the impact of non-adherence to drug therapy: a technical note concerning an application of a branch and
Daniel Smith1, Christina Pagel, Martin Utley
1Clinical Operational Research Unit, University College London, Gower Street, London WC1E 6BT, UK.
Abstract:
Pharmacokinetic models typically rely on a key assumption that patients take their medication as prescribed, whereas this is often not the case. We present a branch and bound algorithm that can be used to estimate the time-varying probability that, given a specified pattern of nonadherence to a prescribed regimen, a patient receives no therapeutic benefit from treatment. Use of this algorithm is a much faster method for obtaining this probability than exhaustive computation of the relevant probability distribution. The use of this algorithm to assess, in quantitative terms, the impact of non-adherence on the effectiveness of treatment provides a rational basis for evaluating the potential harm to patients.
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