Gardai say the drugs are highly dangerous.
A sunbstance called PMMA has been detected in green pills and can cause death. It's more lethal than MDMA.
PMMA is Para-Methoxy-Meth-Amphetamine, a member of the amphetamine (speed) family.
Green pills have an apple or rolex symbol and white pills have a Mitsubishi logo.
The Health Service Executive has also issued a warning about the dangers of the pills.
98fm's Trish Laverty reports:
