Well, I thought that too. But you know it IS a drug in solution used for mucus control in respiratory treatments. And as such is a sterile solution and RX only.
Called Mucomyst. Not seen in retail or commonly in home use, but mostly long term care, hospitals, and perhaps hospice.
http://www.drugs.com/cons/mucomyst.html
So I guess it is both.
It is also given to people poisoned by acetaminophen (Tylenol) in hospital ERs. It prevents the liver damage.
We can purchase it OTC as oral tablets and has been OTC for as long as I've known that way too. I don't recall back when decades ago that there were Mucomyst tablets....I don't think that they were available orally.
http://en.wikipedia.org/wiki/Acetylcysteine
Some interesting other uses on the wiki article at the end.
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Weezie looking at petunias 8.25.2017
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