The way it neutralizes the toxic effects of the drug is by recharging glutathione, thereby preventing liver damage.
Interestingly, NAC may also be useful against COVID-19, as explained by pulmonologist Dr. Roger Seheult in the MedCram lecture above. By raising glutathione, it helps combat oxidative stress, which is a main factor in the cytokine storm associated with COVID-19.
A recent literature analysis1 linked glutathione deficiency to COVID-19 disease severity, leading the author to conclude that NAC may be useful both for prevention and treatment. NAC may also combat the abnormal blood clotting seen in many cases, and helps loosen thick mucus in the lungs.