 Most chemotherapeutics are dosed in a single day, with a 2- or 3-week interval between doses; however, several regimens are administered over more than 5 days and others are given at frequencies e.g. every 5 days. Thus, more than one patch may be required to provide continuous antiemetic prophylaxis. Characterisation of the pharmacokinetics of multiple transdermal dosing offers useful information for clinicians who treat patients with the latter types of regimens. 