An antidote is a drug, chelating substance, or a chemical that counteracts (neutralizes) the effects of another drug or a poison.
There are dozens of different antidotes; however, some may only counteract one particular drug, whereas others (such as charcoal) may help reduce the toxicity of numerous drugs. Most antidotes are not 100% effective, and fatalities may still occur even when an antidote has been given. Some examples of antidotes include:
Acetylcysteine for acetaminophen poisoning
Activated charcoal for most poisons
Atropine for organophosphates and carbamates
Digoxin immune fab for digoxin toxicity
Dimercaprol for arsenic, gold, or inorganic mercury poisoning
Flumazenil for benzodiazepine overdose
Methylene blue for drug-induced methemoglobinemia
Naloxone for opioid overdose
Pralidoxime for poisoning by anti-cholinesterase nerve agents.
Data
Source:drugs.com
Acetylcysteine (not For Injection)
Acetylcysteine inhalation is used along with other treatments to relieve chest congestion due to thick or abnormal mucous secretions in people with lung conditions including asthma, emphysema, bronchitis and cystic fibrosis (an inborn disease that causes problems with breathing, digestion, and reproduction). Acetylcysteine is in a class of medications called mucolytic agents. It works by thinning the mucus in the air passages to make it easier to cough up the mucus and clear the airways.