Two people have died at a Sydney house party after overdosing on heroin, which they believed to be cocaine.
The substances resulted in the deaths of two people, while two others were hospitalised, NSW Health warned.
“A heroin overdose could quickly result from a single line,” NSW Health chief addiction medicine specialist Dr Hester Wilson warned.
Know the news with the 7NEWS app: Download today
“It is important that people recognise the signs of an opioid overdose early and know how to respond.”
The Sydney Morning Herald reported the overdoses had occurred at a house party in Glebe’s inner west.
Wilson said opioids can cause pin-point pupils, drowsiness, loss of consciousness, slowed breathing/snoring and skin turning blue/grey and can be life-threatening.
“One of the dangers of illicit drug supply is the strength and contents of the substance you are getting is unknown and can be inconsistent,” she said.
“Heroin and other opioids can be sold as or found in cocaine, methamphetamine, and MDMA (ecstasy). You cannot always tell the difference between these drugs by appearance.
“In light of this detection, people who use drugs such as cocaine, methamphetamine, MDMA or opioids should carry naloxone.”
Naloxone is an important life-saving medication that reverses the effects of opioids.
NSW Health warns people who witness someone experiencing any unexpected symptoms after using drugs to call triple-0 immediately or seek urgent medical attention.
NSW Health advised naloxone should be given immediately if available.