A synonym for activated carbon, this substance is most frequently used medical settings to treat poisonings that have occurred via ingestion. Typically, if a person has been poisoned, activated charcoal must be administered within an hour to be effective. It is important to note that activated charcoal suspensions used to treat poisonings are not effective in treating cyanide poisoning, corrosive agents, iron, lithium, alcohols, or malathion. In most cases, activated charcoal is administered in liquid form by mouth, or it is delivered directly to the stomach using a nasogastric tube. Activated charcoal is also used in high end hemoperfusion machines to filter and eliminate toxins from the bloodstream. Typical side effects of ingesting activated charcoal include vomiting, black stools, diarrhea, and constipation. Lower doses of activated charcoal in tablet form or edible form are also used as a common home remedy for flatulence, sour stomach, indigestion, and various other gastrointestinal problems.