Eyewitnesses say the man was seen lying on a stretcher outside the hospital around 11.30am surrounded by emergency services personnel wearing HAZMAT suits.
A number of emergency vehicles are parked on the road near the hospital, adding to the already heavy traffic on Shirley Street.
A NSW Fire & Safety media spokesperson told Echonetdaily a farmer had called the hospital saying he was possibly exposed to organophosphates while spraying cattle.
He said the man was suffering from blurred vision and vomiting.
The man has subsequently been decontaminated by NSW Fire & Rescue HAZMAT staff and has been handed over to the hospital for further treatment.
A NSW Health spokesperson told Echonetdaily the man remains in hospital under observation. He is in a stable condition and is expected to be released this afternoon.