The liver is on overdrive when you drink alcohol. Pandol (Tylenol) or by drug name paracetamol (acetaminophen) are metabolized by the liver which adds extra stress to the liver. read more
It is bad that you went on to drinking after taking the medicine. On to the point though: you most likely will not notice or feel a big consequence after this one time given that, that (a) it is the first time you took med and drank alcohol, (b) your liver is healthy (c) your drinking is on the low side. read more