RT Book, Section A1 Smollin, Craig A1 Olson, Kent R. A2 Papadakis, Maxine A. A2 McPhee, Stephen J. A2 Rabow, Michael W. SR Print(0) ID 1175795355 T1 Paraquat Poisoning T2 Current Medical Diagnosis & Treatment 2021 YR 2021 FD 2021 PB McGraw-Hill Education PP New York, NY SN 9781260469868 LK accessmedicine.mhmedical.com/content.aspx?aid=1175795355 RD 2022/07/05 AB Paraquat is used as an herbicide. Concentrated solutions of paraquat are highly corrosive to the oropharynx, esophagus, and stomach. The fatal dose after absorption may be as small as 4 mg/kg. If ingestion of paraquat is not rapidly fatal because of its corrosive effects, the herbicide may cause progressive pulmonary fibrosis, with death ensuing after 2–3 weeks. Patients with plasma paraquat levels above 2 mg/L at 6 hours or 0.2 mg/L at 24 hours are likely to die.