nasal spray

The other day I saw an advertisement on tv for a nasal allergy spray, which if I'm remembering correctly was called Veraflu (don't hold me to that name). On the ad though at the bottom of the screen at one point it specifically stated in writing "The way in which (product name) works is not yet understood." Isn't it illegal to sell medications when scientists or whoever don't even know how they work?

I noticed that as well about a month ago. Weird. Although, I think it said "not fully understood."

Still though, if we don't know how it cures symptoms, couldn't it be also having a negative impact on us? It's like the drug company has adopted a common stance that a lot of people have with electronics, "I don't know how it works, I just know it does."

-Warlo