A 14 and a 15 year old are believed to taken blue transformer tablets.
Two 16-year-old's were also taken ill.
A 28-year-old man from Tiverton was arrested on suspicion of possession with intent to supply a Class A drug.
He's since been released pending further enquiries.
Police have issued a warning about the dangers of taking drugs.
Skydivers killed in Dunkeswell incident named
Investigations are underway
Manhunt for Salisbury man following Exmouth assault
He was last seen on 13 June
School closes following burst water main
Totnes hit by outage
Member of public helps police officer under attack
A man has been arrested
Battery storage site unanimously rejected over pollution fears
Another battery energy storage system (BESS) has been rejected
Tweaked plans for four homes near Exeter airport approved
Further applications will be required
