It's as effective as some of the front-line antibiotics, such as vancomycin and daptomycin, and is a genuine answer to the antibiotic-resistant 'superbugs', say researchers at the University of Queensland.
They made the discovery almost by accident. They had been testing a synthetic form of cannabidiol on simple skin conditions when they realised it was successfully treating serious staph infections.
The cannabidiol continued to be effective over a long time, suggesting the bacteria weren't becoming resistant.
Cannabidiol also works as an anti-inflammatory, says Dr Mark Blaskovich, the research team leader, and so it's also clearing up damage caused by bacterial infection.
The most promising news of all is that cannabidiol successfully treats the antibiotic-resistant 'superbugs', he says, and can combat biofilms, a physical form of bacterial growth that leads to difficult-to-treat infection.