Acute and chronic effects, including overdose, from the use of - ecstasy

Description

MDMA ("ecstasy") - mixed stimulant/mild hallucinogenic (entactogen)
Acute: euphoria, empathy/sociability, mild sympathomimetic effects, bruxism, hyperthermia at high dose/hot environments
Dangerous acute complications: hyponatraemia, serotonin syndrome, hyperthermia -> multi-organ failure

Associated with festival/party settings; several Australian festival deaths have driven public health "pill testing" and harm-reduction debate
Variable purity/dose of illicit tablets/capsules is a major driver of unpredictable severe reactions

inc release of serotonin, dopamine, noradrenaline
Hyponatraemia: combination of SIADH-like ADH release + behavioural excess water intake (over-correction advice from harm-reduction messaging, or thirst from hot/crowded venues) -> can cause cerebral oedema, seizures, death - a specific and underappreciated MDMA complication
Hyperthermia: serotonergic + sympathomimetic effect combined with hot, crowded environments and continuous dancing -> impaired heat dissipation

Clinical + sodium level essential in any unwell MDMA user - hyponatraemia can be rapidly fatal and is easily missed if attention focuses only on hyperthermia/agitation
Assess for serotonin syndrome features (clonus, hyperreflexia) especially if co-ingested with SSRIs
CK, renal function, coagulation if hyperthermic (rhabdomyolysis, DIC risk)

Do NOT give free water/hypotonic fluids empirically - check sodium first; hyponatraemic patients need fluid restriction +/- hypertonic saline if severe/symptomatic (seizures)
Active cooling for hyperthermia; benzodiazepines for agitation/seizures
Cyproheptadine for significant serotonin toxicity
Supportive management of rhabdomyolysis/DIC if severe

Hepatotoxicity (idiosyncratic, can be severe)
Cardiac arrhythmia, especially with hyperthermia/electrolyte derangement
Depression/anxiety in the days following use ("midweek blues") from serotonin depletion

Uncomplicated intoxication resolves over several hours
Severe hyponatraemia or hyperthermia can progress rapidly to death within hours if unrecognised - this is the key teaching point, not the more benign "typical" presentation

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