Officers said the tablets, which have a small cherry logo inscribed on one side and a half score on the other, are also responsible for a number of other young people becoming ill in the Strathclyde force area in the last few weeks.
AMT or 5-IT are potentially toxic stimulants that have been found by forensic scientists in tablets similar in shape and size to ecstasy pills.
The stimulants are not controlled under the Misuse of Drugs Act 1971, meaning they are not monitored by medical experts.
Strathclyde Police said it is continuing to work with health officials, medical staff and pub and club workers in connection with the investigation, to establish where the pills have come from.
Superintendent Kirk Kinnell said: "These substances are unreliable, unpredictable and very dangerous. Users may believe that they have taken ecstasy, and it is very likely that they will suffer from a significant negative reaction. These pills are not covered by any form of quality control and this is supported by forensic analysis."