Oral oxybutynin (OOx) is an effective and safe treatment for the treatment of hyperhidrosis (HH). However, in some patients a loss of efficacy during prolonged treatment has been observed. Analysis of these cases could enable us to identify patients susceptible to OOx tolerance. An alternative treatment might then be considered. To assess tolerance to OOx in the treatment of HH. Secondarily, to assess epidemiological data and the duration of efficacy, together with the probable causes of any loss in this respect. Retrospective study of patients who started treatment with OOx for HH
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