Will the alcohol in breath mints and mouthwash cause nausea if i am taking flagyl?

No: You are correct that you should not drink alcohol when using Metronidazole (flagyl). The small amount of alcohol in a breath mint would not be enough to trigger a reaction.

Not usually: There is such a small amount of alcohol in mints you should not have a problem. Mouthwash usually does contain alcohol, but you should be fine as long as you don't swallow it. I wouldn't worry about it.

Probably not: Too little to cause a problem.