I took 2 30 ml of tylenol (acetaminophen) cold and flu liquid. (2nd one after 4 hours) does this damage my liver?

Tylenol (acetaminophen) overdose: No as long as you stopped there and didn't take any other tylenol (acetaminophen). Tylenol (acetaminophen) will damage your liver if you take more than recommended by the manufacturer.

No.: You exceeded the medication's manufacturer's recommendation, but not the liver's capacity to clear medications. You shouldn't do this regularly especially if you drink alcohol.