Symptoms include low blood pressure, nausea, vomiting, liver failure, kidney failure. Gastrointestinal distress (nausea/vomiting) begins ~8-12 hours after ingestion. After up to 24 hours have passed, symptoms seem to disappear, victim can feel fine for up to 72 hours. Liver and kidney damage symptoms start 3-6 days after mushrooms were eaten.
Early treatment is important. Contact medical authorities immediately. To speed up treatment and improve the outcome, bring specimens of the mushroom with you to the hospital and information on the specific location where the mushrooms were found.