Antidote (patient information)
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An antidote is a substance which can counteract a form of poisoning.
Sometimes, the antidote for a particular toxin is manufactured by injecting the toxin into an animal in small doses and the resulting antibodies are extracted from the animals' blood. The venom produced by some snakes, spiders, and other venomous animals is often treatable by the use of these antivenoms, although a number do lack one, and a bite or sting from such an animal often results in death. Some animal venoms, especially those produced by arthropods (e.g. certain spiders, scorpions, bees, etc.) are only potentially lethal when they provoke allergic reactions and induce anaphylactic shock; as such, there is no "antidote" for these venoms because it is not a form of poisoning, though anaphylactic shock can be treated (e.g., by the use of an EpiPen).
Some other toxins have no known antidote. For example, the poison ricin, which is produced from the waste byproduct of castor oil manufacture, has no antidote, and as a result is often fatal if it enters the human body in sufficient quantities.
Ingested poisons are frequently treated by the oral administration of activated charcoal, which absorbs the poison, and then it is flushed from the digestive tract, removing a large part of the toxin.
Poisons which are injected into the body (such as those from bites or stings from venomous animals) are usually treated by the use of a constriction band which limits the flow of lymph and/or blood to the area, thus slowing circulation of the poison around the body.
Poison and toxic signs
- Anticholinergic poisoning is given physostigmine sulfate as the antidote.
- Anticholinesterase poisoning is given atropine sulfate and pralidoxime chloride 2-PAM as the antidote.
- Benzodiazepine poisoning is given flumazenil as the antidote.
- Beta blocker poisoning is given glucagon as the antidote.
- Carbon monoxide poisoning is given oxygen as the antidote.
- Cyanide poisoning is given amyl nitrite, sodium nitrite, and thiosulfate as the antidote.
- Digoxin poisoning is given Fragment antigen binding(Fab) fragments that bind to digoxin (trade names Digibind® and Digifab®) as the antidote.
- Ethylene glycol poisoning is given ethanol or fomepizole as the antidote.
- Extrapyramidal reactions associated with antipsychotic poisoning is given diphenhydramine hydrochloride and benztropine mesylate as the antidote.
- Heavy metal poisoning is given chelators, calcium disodium edetate (EDTA), dimercaprol (BAL), penicillamine, and 2,3-dimercaptosuccinic acid (DMSA, succimer) as the antidote.
- Heparin poisoning is given protamine sulfate as the antidote.
- Iron poisoning is given deferoxamine mesylate as the antidote.
- Isoniazid poisoning is given pyridoxine as the antidote.
- Methanol poisoning is given ethanol or fomepizole as the antidote.
- Methemoglobinemia poisoning is given methylene blue as the antidote.
- Opioid poisoning is given naloxone hydrochloride as the antidote.
- Paracetamol (acetaminophen) poisoning is given N-acetylcysteine as the antidote.
- Thallium poisoning is given Prussian blue as the antidote.
- Warfarin poisoning is given vitamin K phytonadione and fresh frozen plasma as the antidote.
Acknowledgements
The content on this page was first contributed by: C. Michael Gibson, M.S., M.D.
Initial content for this page in some instances may have came from Wikipedia and AskDrWiki
Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources:
2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3
3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7
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Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
