What are adverse effects of ecstasy?

The acute physical effects of MDMA at low to moderate doses resemble those of a stimulant: increased muscle tension, jaw clenching, tooth grinding (bruxism), restlessness, insomnia, ataxia, headache, nausea, decreased appetite, dry mouth, dilated pupils, and increased heart rate and blood pressure Cardiac arrhythmias Severe cerebrovascular accidents Hepatotoxicity The most dangerous is hyperthermia, which results from a combination of direct thermogenic effects of the drug (probably via adrenergic mechanisms), increased physical activity (as through vigorous dancing), warm environment (as in a crowded, poorly ventilated dance club), and disruption of thermoregulation by the drug, often exacerbated by dehydration Severe and potentially fatal hyponatremia induced by (SIADH) Panic attacks, paranoid psychosis, depression