Effect of Shakuyakukanzoto on Chemotherapy-Induced Hiccups in Patients with Lung Cancer.

Shakuyakukanzoto, one of the traditional herbal medicines commonly used in North-East Asian countries, is known to be effective for muscle cramps. This retrospective study aimed to evaluate the effect of shakuyakukanzoto on chemotherapy-induced metoclopramide-uncontrolled hiccups. We retrospectively investigated the medical records of all the consecutive patients with lung cancer who were prescribed with shakuyakukanzoto (Tsumura Co. Tokyo, Japan) for chemotherapy-induced hiccups in our hospital from September 2013 to November 2017. In the medical record from the initiation of shakuyakukanzoto until the start of the next chemotherapy, when there was description of "complete or partial disappearance of hiccups" after the prescription of shakuyakukanzoto, it was judged as a complete or partial response. A statement of "unchanged," no description of improvement, or exacerbation was judged as no change. Of the 49 chemotherapy courses in 15 patients with lung cancer, 93.9% had a "partial or complete" response within a few hours after the administration of shakuyakukanzoto. The effect of shakuyakukanzoto was observed irrespective of the pathological type of lung cancer, platinum-containing or non-platinum chemotherapy, and with or without other anti-hiccup drugs. No adverse event was observed. Shakuyakukanzoto may offer an effective pharmacological approach to treat chemotherapy-induced metoclopramide-uncontrolled hiccups. Well-planned prospective studies will confirm our results.

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Conflict of Interest: The authors declared no conflicts of interest.