Vomiting, constipation, diarrhoea, black stools, swelling of abdomen, bowel obstruction; platelet aggregation, charcoal embolism, thrombocytopenia, haemorrhage, hypoglycaemia, hypocalcaemia, hypothermia, hypotension (haemoperfusion with activated charcoal); blackening of teeth and mouth; hypernatraemia, hypokalaemia, hypermagnesemia (with concomitant admin with cathartics).