A member asked:

Does benzalkonium chloride aggravtes nasal congestion? should we avoid saline sprays that contain it?

A doctor has provided 1 answer
Dr. John Chiu answered

Unusual but possible: Since people are so different in their tolerance, it is possible but usually not observed if only used twice daily. You can also use just boiled water to make the saline followed by cooling. This may have to be done for each occasion however. Have you tried preservative-free saline in a canister?

Answered 10/23/2014

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