Gastrointestinal disorders: Nausea, vomiting
Cardiac disorders: Tachycardia, palpitations (thumping heart), reactive hypertension, bradycardia, ventricular ectopics, heart rhythm/rate variability
Nervous system disorders: Dizziness
Psychiatric disorders: Restlessness
Potentially Fatal: Delusions, hallucinations. Seen with hypersensitivity and overdosage. Acute CNS and CVS stimulation presenting as vomiting, fever, hypertension, psychosis. Cardiac arrhythmias.