Police have confiscated an estimated $4.3 million worth of psychoactive substances during the largest seizure of synthetic drugs last week.

Around 173kg of illegal substances were seized during a large scale operation into synthetics by Canterbury Police. A seizure of this amount translates to an estimated street value of between $3.4 and $4.3 million.

During the operation, police searched twelve addresses across Christchurch city which also resulted in over $2.5 million dollars' worth of assets being restrained.

A parallel financial investigation was also conducted as part of the overall investigation strategy by the Police Asset Recovery Unit.

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As a result, High Court Restraining Orders have been obtained to restrain over $2.5 million in commercial and residential property as well as luxury motor vehicles and cash.

Five people are facing charges in relation to this operation.