Symptoms
Symptoms and signs of abdominal pain, vomiting and diarrhoea appear within 60 minutes. Cardiovascular collapse with coma may follow. Some improvement may occur after this phase which, in some patients, is followed by recovery. In others, after about 16 hours, deterioration may occur involving diffuse vascular congestion, pulmonary oedema, convulsions, anuria, hypothermia, severe shock, metabolic acidosis, coagulation abnormalities and hypoglycaemia.
Management
Vomiting should be induced immediately, followed as soon as possible by parenteral injection of desferrioxamine mesylate, and then gastric lavage. In the meantime, it is helpful to give milk and/or 5% sodium bicarbonate solution by mouth.
Dissolve 2g desferrioxamine mesylate in 2 to 3ml of water for injections and give intramuscularly. A solution of 5g desferrioxamine in 50 to 100ml of fluid may be left in the stomach. If desferrioxamine is not available, leave 300ml of 1 % to 5 % sodium bicarbonate in the stomach. Fluid replacement is essential.
Recovery may be complicated by long-term sequelae such as hepatic necrosis, pyloric stenosis or acute toxic encephalitis which may lead to CNS damage.
Paediatric population
Acute overdose of oral iron requires emergency treatment. In young children 200-250mg/kg Ferrous Fumarate is considered to be extremely dangerous.