In experiments performed in petri dishes, the drug is promising. It punctures fungal cells, but not rat blood cells or human skin cells—a good sign that it may work against infections without too many ill side effects. The fungal cells also didn’t develop any resistance to the drug after several generations, which is important for a drug to keep working for a long time after it’s introduced. So the material, which can be made from plastic bottles, could be a candidate anti-fungal drug. Like other drugs, however, it will require a decade or more of testing to confirm it’s both safe and effective for people to take.