We may have a new way of protecting against COVID-19 that checks almost all the boxes: It's effective, it's affordable, it's easy to apply, it's already approved as safe for public use, it's available without prescription… and it's called azelastine .

This nasal spray has been available over the counter for decades now, under a variety of brand names, in over 70 countries . It's used to treat several allergies, including hay fever , and a new trial into its effectiveness at preventing COVID-19 was launched after promising results in lab tests and people with a SARS-CoV-2 infection .

The eight-week trial was led by a team from Saarland University in Germany. The researchers divided 450 participants into two groups: one group used an azelastine nasal spray three times a day, wh

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