Euphoria
Agitation
Tachycardia, palpitations, hypertension
Disseminated intravascular coagulation
Intracranial hemorrhage
Severe hypertension or hypotension
Hypotensive bleeding
Hyperreflexia
Agitation
Confusion
Paranoia
Stimulant psychosis
Cognitive deficit
Coma
Seizure
Hallucinations
Loss of consciousness
Serotonin syndrome
Hypertonia
Rhabdomyolysis
Acute respiratory distress syndrome
Acute kidney injury
Cerebral edema
Hepatitis
Hyperpyrexia
Hyponatremia (from sweat loss, free water intake, and SIADH-like effect)
Ecstasy 
Cocaine
Amphetamines
Benzocaine
Synthetic cathinones 
Ketamine
Synthetic cannabinoids
Toxic alcohols