For example, an overdose of acetaminophen (Tylenol) can destroy half of a person's liver
less than a week. Barring complications, the liver
can repair itself completely and, within a month, the patient will show no signs of damage.
However, sometimes the liver gets overwhelmed and can't repair itself completely, especially if it's still under attack from a virus, drug, or alcohol. Scar tissue develops, which becomes difficult to reverse, and can lead to cirrhosis.