Antidotes are drugs which limit or prevent the effects of poison.
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Activated charcoal, an antidote for poisoning, is a decontaminant in the gastrointestinal tract. This article shares details about how it works, how it is given, and what situations are contraindicated. - Activated Charcoal
http://www.emedicinehealth.com/activated_charcoal/article_em.htm
This brand name of the generic atropine is the subject of this dissertation, which includes who to use it, safety information, and possible side effects. - Drugs.com: Sal-Tropine
http://www.drugs.com/cdi/sal-tropine.html
Contains information about naloxone Hydrochloride, trade name Narcan, an opioid antagonist. Details include professional and consumer reviews, side effects, and contraindications. - RXList: Narcan
http://www.rxlist.com/narcan-drug.htm