The children, between the ages of 11 and 13, were transported by ambulance to Condell Medical Center in nearby Libertyville. All are listed in stable condition after each took one prescription pain pill.
"One of the students that received this medication had second thoughts and told the teacher, turned the medication in. Then it was determined who got the prescription pills," Chief John Nixon, Antioch Fire Department, said.
None of the students had any signs of side effects, but all were checked out as a precaution.
"They have to because the students are minor, they have to contact medical professionals for assistance," Chief Nixon.
School officials emailed parents and guardians about the situation.
"I think it is terrible. . . I really don't know what's happening to these children today," Judith Michellic, a grandmother, said. "I'm glad I'm not raising kids today."