The theft of a medical bag stolen from a South Auckland medical centre has raised alarms with police due to its contents.

Counties Manukau Police have issued a warning on Facebook after a medical bag was taken from the Clendon Medical Centre, located on Palmers Rd in Manurewa.

Inspector Mark Benefield said at 9.39am on September 20, an unknown male entered the medical centre and proceeded to take the bag and a scanner.

"The bag contained a very strong drug when if taken in the wrong dose can be fatal."

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Benefield said there were 24 tablets of the drug, each 7.5 milligrams in size, which are used as a sedative.

"If someone has too many of them it will have an impact on their ability to breathe," he said.

"Police are very concerned that this drug will be misused and members of our community could be in danger."

The stolen bag also contained $200 in cash.

Benefield said police are carrying out area inquiries in order to try identify the offender, and will be reviewing CCTV footage.

Anyone with information on the burglary is advised to call Inspector Mark Benefield on 021 191 3113, or Crimestoppers anonymously on 0800 555 111.