A 73-year-old man consumed a decoction of the medicinal herb Erycibe henri Prain (‘Ting Kung Teng’), as recommended in traditional Chinese medicine for arthritis. Subsequently, he developed a cholinergic syndrome that included dizziness, diaphoresis, chills, lacrimation, salivation, rhinorrhoea, nausea, and vomiting. He was also hypothermic and hypotensive. Notable laboratory values included a normal serum cholinesterase and transiently elevated blood urea nitrogen, creatinine, and glucose. Active constituents of the herb include a number of tropane alkaloids, one of which possesses cholinergic rather than anticholinergic activities.