How long does tylenol (acetaminophen) 3 stay in your system? Will it show in a drug test if I haven t used it in 3 days?

No. The half-life elimination of Tylenol (acetaminophen) in adults is around 2-3 hours. There is no way Tylenol is still in your system if you used it 3 days ago. Either way Tylenol is not a standard component on a drug test. Drugs like amphetamines, cocaine, marijuana, and opiates are usually screened. Common over-the-counter medications like Tylenol are not typically a concern.