The incident has raised alarms among health authorities, prompting them to warn about dangerous substances being sold as cocaine.

Naloxone is available without a prescription and can be obtained for free from select pharmacies and health services in NSW.

Health officials recommend that users not consume drugs alone and seek immediate help if unexpected symptoms occur, reinforcing the importance of carrying naloxone.

Dr. Hester Wilson, the chief addiction medicine specialist at NSW Health, emphasized that heroin overdoses can occur rapidly, sometimes from just one use.

Signs of an opioid overdose include pinpoint pupils, drowsiness, loss of consciousness, slowed breathing, and skin discoloration, which can be life-threatening.

In light of these dangers, Dr. Mary Ellen Harrod from the NSW Users and Aids Association described the recent deaths as tragic but preventable, urging drug users to take precautions.

To mitigate risks, NSW Health advises individuals who use drugs, including cocaine and methamphetamine, to carry naloxone, a medication that can reverse opioid overdoses.

Recently, two individuals tragically died from heroin overdoses after consuming what they believed was cocaine at a house party in Glebe, Sydney.

NSW Health has issued an urgent warning regarding the dangers of consuming illicit drugs, emphasizing that their strength and contents are often unknown and inconsistent.

This warning follows a previous incident in Melbourne where four individuals died from opioid overdoses, highlighting the growing concern over the mixing of opioids with stimulants.

Experts have noted an increasing trend of opioids being mixed with stimulants like cocaine, methamphetamine, and MDMA, making it difficult for users to identify what they are consuming.

Heroin and other opioids can be disguised as or mixed with these stimulants, complicating identification based on appearance alone.