RT Book, Section A1 Smollin, Craig A2 Papadakis, Maxine A. A2 McPhee, Stephen J. A2 Rabow, Michael W. A2 McQuaid, Kenneth R. SR Print(0) ID 1184179834 T1 Paraquat Poisoning T2 Current Medical Diagnosis & Treatment 2022 YR 2022 FD 2022 PB McGraw-Hill Education PP New York, NY SN 9781264269389 LK accessmedicine.mhmedical.com/content.aspx?aid=1184179834 RD 2024/04/18 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.