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.
Inspector to rule on Exeter city centre gambling arcade
'This is not the right place for it'
Child sex offender from Devon jailed for 12 years
Craig Short will serve six years on extended license too
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Some uncertainty about whether it will re-open
Did your councillor vote in favour of asking to postpone May’s elections?
How did your local representative vote?
Developer drops affordable homes from Harlequins scheme
Claims council being 'held hostage'
Girl in hospital after suspected hit-and-run
Van hits horserider in Launceston
