At least six prisoners have been taken to hospital.
A number of inmates at Portlaoise Prison have been hospitalised following a suspected drug overdose.
At least six prisoners have been taken to hospital - although more are expected to have been affected.
The Irish Prison Service says it's working closely with the HSE, and has secured extra naloxone kits, which are used to temporarily reverse the effects of opioids.
The service says it's committed to stopping drugs from entering prisons, adding that staff have increased the use of random and intelligence led cell searches on a daily basis.
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