Following ingestion of .85 gm. of phenformin, in a suicide attempt, the principal symptoms were violent gastrointestinal cramping, nausea, and vomiting, all of a few hours' duration. This appeared to provide major protection against other toxic effects. There was no significant hematemesis or melena. Blood lactate was normal and no ketonuria was observed. Blood sugars were in the hyperglycemic range.

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