Originally Posted by
N1120A
Yes it is allowed and in any amount. Prescription mouthwash, just like the prescription toothpaste I carry, is a medical necessity for a lot of people.
Further, the TSA has no business even asking what it is for or to see proof.
I completely agree with your answer but we all know that what happens at a TSA checkpoint may be entirely different.
If you have a medically exempted liquid over 3.4oz and a TSA employees says it cannot be cleared stand your ground, get others involved.
If all else fails be sure to get names and file complaints against the individuals.