Iron, found in many OTC multivitamins, prenatal vitamins, and supplements, can cause intoxication if ingested by an animal. Of note, iron can also be found in fertilizers, pesticides, single use hand warmers and heating pads such as ThermaCare.
Signs and symptoms of toxicity: Clinical signs of poisoning include vomiting, bloody diarrhea, fatigue, abdominal pain, low blood pressure, rapid heart beat, tremors, seizures, and coma.
Toxic consumption: Toxicity in dogs can be seen at doses greater than 20 mg/kg (9 mg/lb) of elemental iron. It is very important to determine the amount of elemental iron in the product. This information may be found on the label. There is no established threshold for toxicity in cats and all incidents of accidental consumption should be reported.