We point out an acetylcysteine protocol that a previous article (D. N. Bateman and J. W. Dear, Toxicol. Res., 2019, 8, 489-498) overlooked. The standard concentration protocol uses a uniform concentration of 30 mg mL-1 for all patients to reduce errors in preparation and administration. Usually a single 1 L bag is sufficient for most patients. Various centers in the US and Canada use this approach.