Two girls and a boy in their mid-teens were taken to Leighton Hospital by ambulance shortly after midnight on Saturday, March 1, after consuming the drugs at a house in Queen Street, Northwich.
Another house in Northwich was later raided by police and the 37-year-old was arrested along with a teenager.
A police spokesman said: “We received the call in the early hours of Sunday, March 2. Three youths had been taken to Leighton Hospital having taken what are believed to be drugs in tablet form.
“Further investigations led to us conducting a search of a property in Northwich, where we discovered a quantity of what are believed to be class A drugs.
“We arrested a 37-year-old man on suspicion of possessing class A drugs and a 15-year-old girl on suspicion of supplying class A drugs.
“They have both been bailed until April 29 pending inquiries.”
The three casualties were all treated and discharged.