Osmotic demyelination syndrome with > 8-10 mmol/l rise in 24 hours
Central pontine myelinolysis is devastating and irreversible
Use of DDAVP to slow correction if overshoot occurs
Harm reduction evidence
Fluid restriction more protective than encouraging water intake
Previous harm reduction advice to drink water caused hyponatremia deaths
Current guidance: no more than 500 ml/hour if using MDMA
Pill testing services reduce exposure to adulterants
Fentanyl contamination of MDMA reported
Methamphetamine substitution detected
Patient Discharge Instructions
copy discharge instructions
MDMA toxicity home care instructions
Rest for at least 48-72 hours after MDMA toxicity
Avoid strenuous exercise
Avoid hot environments
Hydration
Drink normal amounts of fluid — do not over-hydrate
Aim for approximately 2 litres of water per day
Avoid excessive fluid intake which caused your electrolyte problem
Medications
Take any prescribed medications as directed
Do not use SSRIs, antidepressants, or other stimulants without physician guidance
No alcohol for at least 72 hours
Electrolyte recheck
Return for blood test in 24-48 hours if instructed
Important to verify sodium level has normalized
Warning signs to return to ER immediately
Any seizures (shaking, jerking, loss of consciousness)
Confusion or inability to think clearly
Severe headache that is new or worsening
Muscle pain, weakness, or dark brown or cola-colored urine
Chest pain or palpitations
High fever or feeling very hot despite being in a cool environment
Difficulty breathing
Vomiting that prevents keeping fluids down
Follow-up instructions
Attend follow-up appointment as arranged
Blood tests as prescribed to check kidneys and electrolytes
Speak with your family doctor about substance use support services
If you have concerns about mental health, contact your doctor or a counsellor
Substance use information
MDMA can cause serious and potentially fatal complications
Risk is higher in hot environments and with prolonged dancing
Mixing MDMA with other drugs or alcohol significantly increases risk
Resources are available to support safe choices or cessation
References
Guidelines and key sources
Toxicology guidelines and society recommendations
Clinical Toxicology Society position on sympathomimetic toxicity management
Benzodiazepines as first-line treatment
Active cooling for hyperthermia
Poison Control Center guidance
Regional toxicology consultation recommended in severe cases
Available 24 hours for clinical decision support
ACEP Clinical Policy on drug-induced altered mental status
Level B recommendation for benzodiazepines in sympathomimetic agitation
Key evidence sources
Controlled human MDMA administration studies (Pharmacology literature)
Hyponatremia in 31% after single controlled dose
Nonlinear kinetics characterization
ICU outcome series in MDMA toxicity
4% mortality in critically ill MDMA-toxic patients
Hyperthermia as primary mortality predictor
Trismus as leading indication for ICU admission
Exertional hyperthermia literature
Ice water immersion mortality reduction data
Cooling rate and outcomes correlation
Coding and classification
ICD-10 T43.641A — poisoning by MDMA, accidental (unintentional), initial encounter
ICD-10 T43.642A — poisoning by MDMA, intentional self-harm, initial encounter
ICD-10 T43.644A — poisoning by MDMA, undetermined, initial encounter
SNOMED CT 363812000 — drug-induced disorder
SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.