A herbicidal composition, comprising preferably an aqueous solution of a salt of paraquat or diquat, or a mixture thereof, in admixture with a gelling agent that will gel at the pH of human gastric juice, (e.g. magnesium silicate), and further comprising (1) an emetic, (e.g. a triazolopyrimidine emetic) or (2) a purgative (e.g. magnesium sulphate), or (3) both an emetic and a purgative. In the event of ingestion of the composition, these additives act synergistically to reduce absorption of bipyridylium compound from the gastrointestinal tract into the bloodstream, and thereby reduce the oral toxicity of the composition.
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