It's never a good idea to mix any medications, including over the counter meds, with alcohol - and especially any meds with acetaminophen (the active ingredient in paracetamol or tylenol). This can increase the risk for liver damage.
However, if this was a one time happening, I would say your chances of developing any problems from this one time event would be very low. I will say, however, if you are a regular or heavy drinker, you probably should avoid anything with acetaminophen in it (be sure to read labels because it's in a lot of cold and allergy meds also).
Hi lordpoison,
You should never mix alcohol with most medications but this is especially true with all opiates and acetaminophen.
It has happened, though not common, that a one time mix of alcohol and acetaminophen has caused irreversible damage. Be very cautious in the future.
Take Care,
~Tuck