AVP and Hyponatremia: In addition, three case reports have indicated poisoning by drinking excessive amounts of water in the framework of Kambô ceremonies, including a syndrome of inappropriate antidiuretic hormone secretion (SIADH) (Leban et al., 2016), and two cases of severe hyponatraemia (Agüero-González et al., 2019; Campodónico et al., 2019).