Children had their "eyes popping out their heads" after eating drug-laced chocolate bought from a local market.
Police have launched an investigation into the chocolate after at least 10 people fell ill.
Ian Godber said that his children had eaten chocolate from the Christmas market in Mansfield.
The dad of five was left “fearing” for their lives after they began feeling “sick and giddy”.
Members of the public have been urged not to eat a bar called Cali-Gold that was claimed to be sold as “mystery bars” at a festive market in Mansfield.
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Godber told the Mansfield Chad: "The kids had four or six squares and then half an hour later, they started to go funny.
"My youngest son was affected the worse.
"All four of my kids had their eyes popping out their heads, felt sick and giddy.
"I phoned the paramedics and they came out and rushed my youngest into A&E because of his symptoms."
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The chocolate was allegedly purchased from the market
Nottinghamshire police
A woman has been arrested after at least 10 people have fallen ill.
An investigation has now been launched by the police along with the Food Standards Agency and the UK Health Security Agency.
Consultant in communicable disease control at the UK Health Security Agency East Midlands Dr Kakoli Choudhury said: "If you have already eaten this chocolate and developed symptoms, please call NHS 111 or contact your GP."
Head of incidents at Food Standards Agency Tina Potter said: "We are working with local authorities, the UK Health Security Agency and Nottinghamshire Police to investigate an incident following reports of illness after eating 'Cali-Gold' chocolate."
Nottinghamshire police are appealing for information
PA
Investigating officers have denied claims online that the chocolate was laced with cannabis with evidence so far not backing the allegation.
Anyone who develops symptoms is being urged to go to hospital.
Dr Choudhury added: "The small number of people who became unwell have fully recovered.
"Investigations are ongoing about what may have caused the illness."
