Which of the following describes typical effects of stimulants and MDMA (ecstasy)?

• A. Drowsiness, lethargy, bradycardia
• B. Nausea, vomiting, diarrhea
• C. euphoria, tachycardia/HTN, hyperthermia, serotonin toxicity, hyponatremia, seizures, mydriasis
• D. Respiratory depression and pinpoint pupils

Answer: (C)

Stimulants and MDMA raise brain monoamines, especially dopamine, norepinephrine, and serotonin, which drives heightened arousal and a strong sympathetic response. This produces euphoria and increased energy, along with cardiovascular effects like tachycardia and hypertension, and thermoregulation challenges that can lead to hyperthermia. MDMA’s serotonergic effects also bring a risk of serotonin toxicity, particularly with higher doses or mixing with other serotonin-boosting drugs, which fits the included sign of serotonin toxicity. Hyponatremia can occur in these users due to excessive water intake and antidiuretic hormone effects, potentially causing seizures. Pupils commonly dilate (mydriasis) from sympathetic arousal. These features together best describe the typical stimulant/MDMA effects.

Signs like drowsiness, lethargy, and bradycardia point away from stimulants and toward depressants; nausea/vomiting/diarrhea aren’t the defining stimulant/MDMA cluster; and respiratory depression with pinpoint pupils is characteristic of opioids, not stimulants.