Symptomatische hyponatriëmie na gebruik van ecstasy

3,4-methylenedioxymetamphetamine (MDMA, ecstasy) is a popular party drug. It is an indirect serotonin agonist and also has dopaminergic and noradrenergic effects. However, its use is not without risk. Severe complications are hyperthermia, rhabdomyolysis, hepatotoxicity and hyponatraemia. We describe a 19-year-old patient who developed symptomatic hyponatraemia after ingestion of ecstasy, probably as a result of inadequate secretion of antidiuretic hormone combined with the intake of large quantities of water.