NSW Health said the batch was found to contain around twice the amount of MDMA usually found in other ecstasy tablets.
The affected tablets are described as grey irregular shaped have an imprint ‘LION’ text on one side.
Medical Director of the NSW Poisons Information Centre Dr Darren Roberts urged people to remain vigilant and reminded of the risks associated with taking MDMA.
“MDMA can cause severe agitation, raised body temperature, seizures or fits, irregular heart rhythm and death,” Roberts said.
“Other risks include taking MDMA in combination with other stimulants, such as amphetamines or cocaine.
“The amount of MDMA in a tablet or capsule can vary a lot, even within the same batch. The health risks from MDMA are greatly increased if high amounts (including multiple doses) are consumed over a short period.”
Roberts said hot environments such as music festivals could increase the risk of serious illness or death.
“Hot environments, such as at music festivals, increase the risk of harm from MDMA,” he said.
“Taking a break from dancing, seeking shade, and drinking water are important measures to reduce the risk of overheating.
“It is very important to remember, if you or a friend has taken drugs and feel unwell, you won’t get into trouble for seeking medical care. If you or a friend feels unwell, please seek help immediately by calling Triple Zero.”