Four people found dead in Melbourne home had 'synthetic opioid' in system

Early tests have confirmed the presence of a synthetic opioid in the system of four people who were found dead in a Melbourne home last week.

Four bodies, of a 32-year-old man, a 37-year-old man, a 42-year-old woman, and a 17-year-old boy, were found in a Bicknell Court home in Broadmeadows at about 2am on June 25.

Police have now said a "synthetic opioid" was found in the systems of all four.

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No presence of fentanyl has been detected.

The deaths are still being treated as non-suspicious.

Victoria's Department of Health recently issued a warning about a dangerous white powder being marketed in the state as cocaine.

"There have been recent serious harms in Melbourne associated with a white powder sold as cocaine that contained protonitazene," the department said in a statement.

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Protonitazene is a highly potent synthetic opioid that can be more potent than heroin.

"The product appears to produce strong adverse effects such as loss of consciousness, respiratory depression, and life-threatening hypoxia (insufficient oxygen for normal functioning)," the statement read.

"Cocaine and protonitazene are very different substances. Cocaine produces stimulant effects, whereas protonitazene produces sedative effects and may lead to opioid overdose."

Anybody with information about the deaths, or about the supply of illicit drugs, is asked to contact Crime Stoppers on 1800 333 000 or online.

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