The Centre for Health Protection (CHP) is investigating a case of suspected mad honey poisoning, after a 35-year-old man became dizzy and started vomiting about half an hour after eating the honey on Friday.

The following day he went to the accident and emergency department at Kwong Wah Hospital and was admitted with low blood pressure and a slow heart rate. He is in stable condition.

"Mad honey poisoning is caused by ingestion of honey containing grayanotoxins derived from plants belonging to the Ericaceae family - including rhododendrons, a CHP spokesman said.

Initial enquiries show the patient had consumed honey mailed to Hong Kong by a friend from Nepal. Investigations are ongoing.