How long after a small amount of diquat poisoning do symptoms appear?

In general, symptoms of mild poisoning from diquat usually appear within 30 minutes to 1 hour after exposure. For some individuals, it may take 2–3 hours for symptoms to develop. Immediate medical attention is essential to prevent life-threatening health complications. Specific details are as follows:

Diquat is a highly toxic substance and a commonly used chemical herbicide. It has strong toxicity and irritant properties. If ingested accidentally, the chemical passes through the esophagus into the intestines and typically causes symptoms within about 30 minutes. The toxic components irritate the mucous membranes of the throat and esophagus, leading to symptoms such as dizziness, nausea, abdominal pain, and vomiting. If exposure occurs via skin contact, the onset of symptoms tends to be slower. The substance may enter the bloodstream through pores, with reactions generally appearing after approximately 1 hour. In cases of minimal exposure or if the chemical has expired, symptoms may take 2–3 hours to manifest, including adverse effects such as skin redness (erythema) and itching.

In daily life, irritant substances should be stored properly and kept out of sight to prevent accidental ingestion or contact. If poisoning is suspected to be severe, prompt medical evaluation and treatment at a hospital are necessary.