History Main / AcquiredPoisonImmunity

* Possibly in ''Series/DoctorWho''. After the Fourth and Sixth Doctors fall to their deaths, future Doctors (especially Ten) appear to have an immunity to it.

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->'''Buttercup:''' And to think...all this time [[PoisonedChaliceSwitcheroo it was your cup that was poisoned]].\\
'''The Man in Black:''' [[TakeAThirdOption They were both poisoned.]] [[CrazyPrepared I spent the last few years]] building up an immunity to iocane powder.
-->-- ''Film/ThePrincessBride''

->He gathered all the springs to birth
->From the many-venomed earth:
->First a little, thence to more,
->He sampled all her killing store.
-->-- A. E. Housman

In short, this trope references the development of immunity to a particular drug or poison [[CharlesAtlasSuperpower by taking small doses for a long time.]]

Here's a typical scenario: The hero has finally appeared at his confrontation with the BigBad, who's seated at his big table, just about to take his evening meal. "There's no reason to be uncivil," the villain says. Would the hero like some wine? The hero takes a drink, and immediately starts choking. The villain laughs - that fool, the hero, should have known that the villain would poison the wine with the dreaded juice of the [[KillEmAll killemall]] fruit!

But what's this? The hero's standing back up! "I knew you'd poison the wine with the dreaded juice of the killemall fruit. That's why I've spent years eating small pieces of killemall fruit, to develop an immunity to the poison!" The hero then [[KickingAssAndTakingNames kicks the villain's tail]].

In some cases, the poison builds up and actually turns the poison-proof character into a PoisonousPerson.

This can be TruthInTelevision, or not, depending on the poison in question. For some poisons, the body produces antibodies to clear them from the system; so, with repeated exposure to small amounts, you can build up a level of circulating antibody that grants immunity to a typical dose. However, there are plenty of other poisons that ''don't'' get cleared from the system and simply build up in your tissues until you reach a lethal dose.

This trope is officially named Mithridatism, after a king who made use of the effect. It backfired when he was defeated and [[DrivenToSuicide tried to commit suicide]]; his immunity to poison [[GoneHorriblyRight worked so well]] that he ended up [[BlessedWithSuck needing to hire]] a mercenary [[ImpaledWithExtremePrejudice to run him through.]]
----
!!Examples:

[[foldercontrol]]

[[folder:Anime & Manga]]
* Killua from ''HunterXHunter'' is immune to virtually all forms of poison due to his family's TrainingFromHell, and is seen happily downing five cans of laxative-laced juice before the Hunter Exam starts.
** He's also "immune" to electricity, eventually making various forms of lightning punches, lightning bolts, and literal lightning reflexes part of his powers.
* Subverted in ''{{Bleach}}'' during the Hueco Mundo arc, Ishida claims to have an immunity to the poison Mayuri's bankai releases, due to [[MadScientistsBeautifulDaughter Nemu]] giving him the antidote after their first encounter. Naturally, [[MadScientist Mayuri being Mayuri]], he revealed that he had long since changed the makeup of the poison so Ishida isn't immune.
* In ''NinjaScroll'', the character Kagero is a poison taster for her master and has become totally immune to poison. It also means that her bodily fluids are highly toxic, which is good for assassination - not so much for potential love interests.
* In ''ApothecariusArgentum'', Argent was fed a number of poisons at a young age so he could be sold as a food taster/assassin. As a side effect, they also turned his blood into some kind of killer acid, and just touching him is enough to make his love interest, the princess faint.
* Assassin Shao Li from ''{{Noir}}'' kills using poisoned fingernail polish and inflicting a small nick on her victim, and in one scene she poisons a man using incense that contains a poison she's built up an immunity to.
* Shi Ryuuki in ''SaiunkokuMonogatari'' built up a resistance to various poisons mostly thanks to growing up as TheUnFavorite at the bottom of a pecking order of six princes and their mothers. Sa Sakujun in the same series built up a similar resistance through bored experimentation, not that it does him a lot of good in the end.
* Most of the Gourmet Hunters in ''{{Toriko}}'' have resistance to various poisons due to incidental or deliberate exposure. Coco is an extreme example, having been exposed to so many toxins that he's able to synthesize them within his body, and on the rare occasion that he's hit with a poison that he ISN'T immune to, he can adjust his immune system within seconds.
* Played for laughs in ''OnePiece'' with Magellan, whose exposure to his own poison leaves him stuck on the toilet for ten hours a day.
** Speaking of Magellan, after he nearly kills Luffy with a cocktail of extremely deadly poisons, Luffy proves resistant to one of those poisons when it's used on him again in a different story arc.
* In ''{{Pokemon}},'' Ash has gotten fried by Pikachu so many times that he's built up a near-total immunity to electric shocks, surviving jolts that were outright ''exploding'' whatever they hit in a later episode. Meowth also made use of his Pikachu-induced shockproofing once.
[[/folder]]

[[folder: Comic Books]]
* Spoofed in ''TheTick'', with a minor character [[CriticalResearchFailure who claims to have been building up an immunity to bullets this way.]]
* Also spoofed in the NewspaperComic ''CloseToHome'', where a golfer subjects himself to gradually stronger shocks of electricity to build immunity to lightning strikes.
* An issue of [[{{ComicBook/Batman}} Batman]] revealed that the title character regularly devises antidotes and methods of controlled exposure to Scarecrow's fear gas. However, every time Scarecrow attacks Batman with a gas, he changes the formula afterwards so that immunizing against the previous has no effect. Batman does it [[CrazyPrepared simply on the off chance that Scarecrow didn't change it this one time]].
** On the topic of Dr Crane, [[BlackestNight apparently]] he's gassed himself so often he's developed an acquired immunity to ''fear itself''.
** The Joker has built up immunity to his trademark poison to the point that mosquitoes ''writhe in pain'' after sucking his tainted blood.
*** Played for laughs in a crossover with ''CaptainAmerica'', where the Joker and the Red Skull discover that their signature poisons are so alike that each is immune to the effects of the other.
** Also, the Joker apparently immune to Scarecrow's fear gas, as one comic has them team up before Scarecrow sprays the Joker with his fear gas, which only resulted in the Joker smashing Scarecrow over the head with a chair.
*** Unless the Joker is so messed up that fear has long since ceased to affect him...
* [[{{Ninja}} Chizu]] in ''UsagiYojimbo'' takes a small dose of poison every day for this reason.
* {{Wolverine}} has assassin Reiko invoke this trope with blowfish toxin, which Jubilee learns while dodging attacks.
* Harley Quinn is immune to Poison Ivy's poisons because of all the, uh... [[LesYay time]] they spent together.
** In the animated series this is [[HandWave Handwaved]] by having Ivy administer the toxins in small doses via injection with a syringe.
*** Considering Ivy can only poison people through kissing... Yeah...
* It's actually a somewhat common martial arts technique in the comics Jademan translated for US release in the 80's and 90's. Indeed, most poison immune characters could actually manipulate their immunity so they could cure someone else's poison by drawing a bit of their own blood and feeding it to them.
[[/folder]]

[[folder: Fanfiction]]
* ''FanFic/AeonEntelechyEvangelion'' combines this with ConditionedToAcceptHorror in Asuka's EVA pilot training, which included controlled desensitizing to anything that causes sanity loss.
[[/folder]]

[[folder: Film]]
* The Battle of Wits scene in ''Film/ThePrincessBride''. The Man In Black has just tricked Vizzini into consuming poisoned wine, and reveals to Buttercup that the wine he'd consumed was also poisoned; [[OutGambitted he had developed immunity to the poison via this method]].
* ''[[UnderSiege Under Siege 2: Dark Territory]]'' has a thug who has been pepper-sprayed so many times, all it does is clear out his sinuses.
** And then he proves it by [[CrowningMomentOfAwesome using it as a breath freshener]].
* In WoodyAllen's ''{{Bananas}}'', Gen. Vargas has a servant on hand to taste his meals in case they are poisoned. One meal does turn out to be poisoned, but the General eats it, anyway, claiming that he's been poisoned so many times to have developed immunity.
* In ''ThankYouForSmoking'', terrorists [[spoiler: try to kill the main character by covering him in nicotine patches, which would overwhelm any normal person, and leaving him naked on the lap of the Lincoln Memorial]]. He survives, and recovers fairly quickly, because he'd been chain smoking for years and had built up a [[BlessedWithSuck superhuman tolerance to nicotine.]] Unfortunately (fortunately?) it also means [[CursedWithAwesome he can never smoke again.]]
* In the 2008 remake of ''GetSmart'', 99 sprays Max with knockout gas. Max says that he developed an immunity to it, then passes out while cursing, "Oh, it's the new stuff!"
[[/folder]]

[[folder: Literature]]
* The murderer in the LordPeterWimsey novel ''Strong Poison'' builds up an immunity to arsenic in this way. This does ''not'' work in RealLife...though the reference books Lord Peter reads really do exist, and they really do [[BlatantLies claim it could work]].
* A {{Discworld}} novel or two mentions a food-taster who has ingested so many poisons that he's not only immune to them but can recognise them by taste (very handy). He can also tarnish silver by breathing on it (not so handy).
** The [[OurVampiresAreDifferent vampires]] in ''Discworld/CarpeJugulum'' have also built up a resistance to garlic, sunlight, holy water, [[BeatItByCompulsion vampiric OCD,]] and holy symbols by this method. [[spoiler:It backfires, sort of. When they lose the immunity, they realize they're surrounded by ''the shapes'' of holy symbols they wouldn't recognize if they hadn't been shown so many different ones becoming immune in the first place]].
* In ''TheCountOfMonteCristo'', old Monsieur Noirtier survives a murder attempt using poison because he has been taking a medicine that contains the same compound, and has built up a resistance to it. Realizing that his granddaughter and heir Valentine is also a target, he starts giving her small doses of his medicine; this saves her life when the poisoner has a go at her. Of course the poisoner later tries again using a different poison, but by then Valentine's LoveInterest Maximilien has called in his friend the Count of Monte Cristo, who saves the day in his own inimitable style.
* Poisoning is the de facto assassination method of the Nyissans in the ''{{Belgariad}}''. So much so that any government official who lives for very long (case in point: Sadi) has not only long since acquired immunity to some poisons, but is trained to recognize many more, and doses himself with antidotes frequently, just in case.
* In the DashiellHammett short story "Fly Paper" (1929) a woman wants to poison her abusive boyfriend, but is afraid he'll be suspicious if she gives him something without drinking it herself. After reading ''TheCountOfMonteCristo'' she takes small doses of arsenic (extracted from fly paper) to build up an immunity, but instead fatally poisons herself. In discussing the case afterward the detectives reveal that [[DidNotDoTheResearch the book is wrong]]; while some people have a natural resistance to arsenic, it's not possible to build up an immunity through controlled exposure. The poison of choice in ''TheCountOfMonteCristo'' is in fact [[http://en.wikipedia.org/wiki/Brucine Brucine]], and '''is''' subject to Mithridatism.
* The A. E. Housman poem ''[[http://www.bartleby.com/123/62.html Terence, This Is Stupid Stuff"]]'' tells about a king who over the course of his life ate small doses of poison in his food to slowly build an immunity to poisons and thus foil potential assassins. This story is used as an allegory; Housman's poem claims that the purpose of his poetry is to inoculate the reader against the evils of the world by describing them in palatable verse.
* Liz Williams' ''The Poison Master'' averts this: the Master Ari Ghairen modifies his own body with spider and snake genes to be both resistant and toxic, in an effort to keep up with the cold war in his Guild.
* The main character in ''The Journey of The Catechist'' gets his water skin poisoned by a snake, in a very low dose, for being nice to it. This gives him immunity to a poisoned dart used by the BigBad later. Not that it helped much.
* This has been foreshadowed for the Dornish nobility in ''{{A Song of Ice and Fire}}'', as it is rumored that the very best hot sauces that the nobility would be buying contain extremely low doses of snake venom.
** Never mind the fact that snake venom works best when injected into the victim, not swallowed...
* In Kalki's classic Tamil novel ''Sivakamiyin Sabadam'' (''Sivakami's Vow''), the villainous monk Naga Nandi builds up an immunity to cobra venom. It gets to the point that it runs through his veins instead of blood, and cobras come flocking to him, attracted by the scent.
* This is a plot point in [[BimbosOfTheDeathSun Sharyn [=McCrumb's=]]] novel ''If I'd Killed Him When I First Met Him''.
* Harnrim Starangh, a Red Wizard from ''[[ForgottenRealms Elminster's Daughter]]''. "It had taken two years of retching weakness to build up a resistance to killing doses of staeradder", but being able to use a fast-acting poison freely was worth it, since his most dangerous foes were other wizards whom he couldn't expect to quickly defeat by magic.
* In ''TheHungerGames'' [[spoiler:President Snow tried to build up a resistance to all of the poisons used to kill his opponents, but wasn't always successful, hence the smell of blood]].
* In 'The Journey of The Catechist" Etjole Ehomba can talk to animals, and a snake puts a very slight poison into his waterskin due to his politeness. He then shrugs off a poisoned dart after having built up an immunity. At which point the dart shooter decides to switch to much more effective magic, and kills Etjole outright.
* The {{Disgaea}} [[DisgaeaNovels novels]] gives an explanation as to why [[Characters/DisgaeaHourOfDarkness Laharl]] survived being poisoned by [[Characters/DisgaeaHourOfDarkness Etna]] in the [[DisgaeaHourOfDarkness game]], the reason was that his crazy aunt [[Characters/DisgaeaNovels Yasurl]] gave him the same poison when he was little and in her care.
* In ''Literature/BestServedCold'' by Joe Abercrombie, poison-master Morveer keeps himself resistant to many of his own poisons by regularly consuming them.
* In the ''[=~Gaunt's Ghosts~=]'' novel ''Traitor General'' it is mentioned that the Nihtgane partisans have built up immunity to the poisons in the Untill fauna.
* Sam of ''VillainsByNecessity'' has developed one of these to just about every poison he's likely to encounter in his career as an assassin - [[CantHoldHisLiquor except alcohol]]. He actually chides his EvilTwin for poisoning a knife with a toxin they are both immune to while they fight.
[[/folder]]

[[folder: Live Action TV]]
* In an episode of ''{{Babylon 5}}'', "Intersections in Real Time", Sheridan is being held prisoner by [=EarthGov=] and subjected to interrogation. At one point, the interrogator is eating a sandwich with delight and offers it to Sheridan, pointing out that he's eating it with no ill effects. It's only after Sheridan finishes eating that the interrogator mentions that it contained a powerful toxin that the latter has built an immunity to. The toxin doesn't kill Sheridan, but makes him ''very'' sick, as intended.
* ''TheTwilightZone'' TOS episode "The Jeopardy Room". A Soviet commissar tricks a defector into drinking wine mixed with a sleep drug by drinking first. He built up an immunity to the drug by repeatedly taking increasing doses over time.
* Christopher Walken's ''SaturdayNightLive'' [[CasanovaWannabe smooth-talking ladies' man]] character "The Continental" has been maced so many times he's built up an immunity to it.
* In ''TheVampireDiaries'' Katherine has built up an immunity to vervain, she can still get disabled by it if taken by surprise by a large enough dose but she gets over it much faster. Stefan uses this technique to get over his addiction to human blood.
* In the ''{{Community}}'' episode "[[Recap/CommunityS1E07IntroductionToStatistics Introduction to Statistics]]", Jeff invokes this trope as the reason Annie's crying would no longer work on him. It does not work.
* Possibly in ''Series/DoctorWho''. After the Fourth and Sixth Doctors fall to their deaths, future Doctors (especially Ten) appear to have an immunity to it.
[[/folder]]

[[folder: Tabletop Games]]
* In ''WarhammerFantasy'', ogre butchers (wizards that eats all kinds of dangerous things to cast spells) have the immune to poison rule, so one would assume they have built up a very handy poison immunity.
* In the Pulp RPG ''SpiritOfTheCentury'' there is an endurance stunt called Developed Immunities that gives a + 2 to resist any poison the character hasn't previously ingested, and + 6 to any he or she has. This makes the character immune to all but the worst of poisons and unluckiest of rolls.
* Of course, ''DungeonsAndDragons'' has this trope in spades. [[PrestigeClass Assassins]] get it automatically, and Dwarfs have an innate resistance.
** Drow were quickly given this trait, because it makes sense. In ''Drow of the Underdark'' -- the first {{sourcebook}} dedicated to them -- it ranged from +4 vs. random ingested poisons to +7 vs. spiders' and their own sleep poison (it's too ubiquitous and safe to ''not'' try this).
** DarkSun boxed set [=DSE1=] ''Dragon's Crown'', book "The Road of Fire". The poisoner Wheelock is immune to all poisons found on Athas because of years of exposure to them.
[[/folder]]

[[folder: Truth In Television]]
* As noted above, the official term for this (Mithridatism) comes from King Mithridates VI, a king of Pontus. He feared assassination so badly that he took small doses of poison regularly in order to become immune to the poison's effects. This backfired when the king was eventually conquered. He attempted to commit suicide by poisoning himself only to find that he was immune; depending on the version of the story you hear, he then either fell upon his sword or had an underling run him through. In either case, the poem says it best: [[http://www.bartelby.net/123/62.html "Mithridates, he died old."]]
** This is a bit far-fetched. In reality, poison resistance of this sort is extremely specific, and also lapses quickly if the regimen of repeated doses is not maintained. Granted, Mithridates might not have had a month to let his own immunity lapse...
*** Except that he wasn't trying to commit suicide in A. E. Housman's poem, he sampled ALL the poisons the world could offer, when men poisoned his food and drink with arsenic and strychnine respectively they were shocked to see him take it in unharmed, he survived to die of old age.
* Supposedly this was a very common practice amongst the upper classes in {{ancient Rome}}. At any rate, it is referenced in the Cambridge Latin textbook series with a similar outcome to Mithridates.
* The movie ''FindingNemo'' posits this as the reason clownfish can survive life among sea anemones. Scientific theories vary on the subject.
** Some species have natural(innate), rather than acquired, poison resistance. Mongooses, for instance, have antineurotoxic and antihemorrhagic factors in their blood by nature, as do other snake-eating species.
* TruthInTelevision for many snake handlers or bee keepers. It's possible to build an immunity to some types of venom by being near-constantly exposed to small doses of them. In fact, people with strong allergic reactions (such as individuals who would normally go into anaphylactic shock from receiving a single bee sting, or unwittingly eating a product containing peanuts) can build up a resistance in such a way, although doing it safely takes hundreds of injections over the course of several years.
* Though they are used to build up immunity to diseases rather than poisons, vaccines operate on this principle as well.
** As do antivenins: a large animal, such as a horse, is exposed to a venom, of a snake, say, repeatedly at gradually increasing levels until an immunity is developed. A serum is then drawn from which the antivenin is derived. Professional snake handlers who have similarly built up an immunity can actually donate their blood directly to people who have been poisoned in order to save their lives.
*** Although horses are best known for antivenom production, this was mostly because horses were readily available to the people doing the work. Horses are in fact unusually poison-susceptible for their body mass, and also, serum drawn from them can have complications in a human recipient. Sheep are increasingly the preferred intermediary.
*** It is noteworthy that the immune response that leads to this immunity is short-lived. While immunity to a virus will linger a lifetime, becaues the body can mobilize a response and produce antibodies before the virus takes hold and multiplies, poison is injected all at once. Unless someone is kept "hyperimmune"(has a sufficient stock of antibodies actively circulating in the bloodstream to deal with the injected venom) by regular inoculations of the toxin, immune response won't trigger fast enough to matter. So, a snake handler may stay immune by getting bit regularly, but after a hiatus of any substantial length, they will again be vulnerable to bites. Typically, doses are administered every 21 days to maintain hyperimmunity.
* According to ''DeadliestWarrior'', the African warlord Shaka Zulu spat poison into his opponent's eyes during battle. He avoided its effects himself by this method, eating small pieces of the plant it came from for years. This may or may not be true.
* While you can't build up an immunity to arsenic, you can build up a ''tolerance.'' When American soldiers came to the UK in World War II those stationed in Cornwall often came down with arsenic poisoning from the water that the locals could drink with no problems.
* The natives in San Pedro De Atacame, one of the hottest and driest wastelands in Chile, have historically developed thousands of years worth of immunity to what little water is available. For those who don't know yet, the water is laced with up to 60 TIMES THE FATAL LEVEL OF ARSENIC! However, they are not entirely unaffected, since many develop skin lesions and sometimes cancer from this overexposure.
* This trope ended up backfiring when a man from Russia attempted to swallow small quantities of toxic mushrooms, arsenic, and cyanide daily to strengthen his body and protect himself from death. He later went into convulsions, slipped into a coma, and died without regaining consciousness. http://www.darwinawards.com/darwin/darwin2007-18.html
** Which is why it's probably best if you [[DontTryThisAtHome never try to imitate something you've only heard about and don't have much experience with]].
* African Honey Badgers. Over their life time, they develop some immunity from the poisonous snakes, scorpions, and bees they regularly prey on. In fact, a male bitten on the cheek by a highly toxic puff adder showed signs of sever pain, but recovered fully within five hours. http://www.youtube.com/watch?v=c81bcjyfn6U
* It also happens with a lot of drugs we don't think of as poisons. The most widespread example might be caffeine: most coffee-drinking adults and energy drink-drinking teenagers acquire a practical immunity to caffeine (in ordinary doses). A cup of coffee or two is rather effective at preventing the withdrawal symptoms than actually stimulating the nervous system of the drinker (though more serious caffeine abuse is still effective). The same thing happens with alcohol, nicotine and most illegal drugs or prescription painkillers and sleeping pills; they are dangerous because the effective dose rises faster than the lethal dose.
** Similarly, this has been found to happen with antibiotics. Recently, doctors have been refusing to prescribe antibiotics to children for basic ear infections, since ear infections tend to get better on their own (and tend to usually be more annoying than dangerous,) and because eventually, over-prescribing antibiotics render them less effective in the event that they catch something more dangerous later on.
* According to legend, the Aztecs got their red skin tone from the arsenic in their systems obtained by taking it over time to build up immunity.
[[/folder]]

[[folder: Video Games]]
* ''{{Nethack}}'' (what else?) features varieties of poisonous meats that have a slight chance of providing permanent poison resistance when consumed. You can similarly gain resistance to heat, cold and electricity by eating certain corpses. Heck, you can even get immunity to {{Disintegrator Ray}}s that way.
** A similar {{Roguelike}} game, ''{{ADOM}}'', gives poison resistance to players who eat corpses of giant spiders.
** Subverted in yet another roguelike, Ragnarok. While it's possible to acquire poison immunity in a similar manner (though most venomous animals are still poisonous to eat), the poison of the phantom asp is so potent it has a chance to kill even through supposed "immunity."
* In ''{{Suikoden}} 2'', one country has a sighting ceremony where the knight and the ruler mix drops of their blood in a bowl and sip from it. One character builds up a tolerance until he can make his ''blood'' lethal to others.
** If I remember it correctly, Jowy took the poison and the anti-toxin, since he wouldn't have been able to develop immunity to the poison that quickly. And even with the anti-toxin, he still needed medical help afterwards.
* In ''FinalFantasy: Crystal Chronicles'', you meet the Selkie De Nam, who decides that the best way to deal with the deadly Miasma is to try to build up a resistance to it by drinking water with miasma mixed in. [[spoiler: It doesn't end well]].
* In ''LostSoulsMUD'', once you have any degree of poison resistance, exposure to poison will develop it further.
* ''NeverwinterNights'' (and D&D 3.5) has acquired poison resistance as part of the assassin class.
* There's a {{Pokemon}} ability that grants this -- Immunity. Only [[BigEater Snorlax]] and Zangoose get it, so one of them is a good ally if the opponent uses Toxic or Toxic Spikes.
* The next version of ''DwarfFortress'' is set to have this as a feature.
* One ''WorldOfWarcraft'' Horde quest has the player fight venomhide ravasaurs (basically venomous raptors) and get splashed with their toxic blood in order to become immune. This is the first step to getting a [[BraggingRightsReward venomhide ravasaur mount]].
* ''FalloutNewVegas'' allows you to build up an immunity to broken limbs. Somehow.
** Broken bones reheal stronger than before they were broken. It's one of the body's coping mechanisms, if you're going to keep getting hurt, you might as well get harder to hurt. Mind, I think it leads to arthritic problems, but y'know, you're the Courier. Either you'll retire, or die fighting.
* In ''RuneFactory3'', your protagonist has a "Poison" skill that goes up whenever he is poisoned by the enemy, or whenever he succesfully poisons one of them with an attack. One of the benefits of raising it is it makes you harder to be poisoned.
* In DragonAge Oghren has spent so many years mistreating alcohol, that he no longer suffers any negative effects from whatever he drinks. Taken further in ''Awakening'' where during the Joining ceremony, upon drinking the darkspawn blood, which typically renders the new Warden's unconscious, he merely ''burps''.
[[/folder]]

[[folder: Webcomics]]
* In ''SomethingPositive'', Kharisma tries to kill Avagadro with cyanide, which he has built up an immunity to after being poisoned by so many people over so many years. He says that he has grown accustomed to the taste, and now puts it on his cereal.
* Gilgamesh Wulfenbach of ''Webcomic/GirlGenius'' has immunity to many many things. Because his father "figures that a ruler should be... ''hard to kill''", what with the people across all the Europe who upset at killing that MadScientist or bombing this town in process... which extends to [[OverlordJr his heir]]. [[spoiler: This came in useful in the current arc where Tarvek suffered a particularly nasty disease -- Gil was able to disregard the risk of infection]].
* Lifolei of ''{{Juathuur}}''... a scary, scary woman.
* ''KeychainOfCreation'': Besides disturbing quantities of alcohol, Ten Winds has reportedly been exposed to toxins, drugs and pharmaceuticals of all kinds and quantities from across [[{{Exalted}} Creation]] over his multi-century lifespan. Stack that on top of his already supernatural Exalted metabolism and you have someone who is ''very'' hard to poison.
** As illustrated [[http://keychain.patternspider.net/archive/koc0144.html here]].
* ''{{Spacetrawler}}'': Dmitri believes that a person can become immune to stun guns, and has started shooting himself repeatedly in order to acquire it. Results: [[spoiler:he acquires a taste for stun-gun shots. And immunity. In that order.]]
* ''Webcomic/TheAdventuresOfDrMcNinja'': Dan [=McNinja=] doesn't need to develop an immunity to poisons. His body separates it out and stores it up so he can squirt it out of his eyes. "Like a toad."
[[/folder]]

[[folder: Western Animation]]
* In ''FriskyDingo'', Killface tries to poison Phil with a "vitoxin" poison, but finds out Phil built up an immunity to it, coincidentally using small doses to help him lose weight. Unfortunately for Phil he didn't build up an immunity to be accidentally shot in the head by a sniper aiming for someone else.
* Similar to the SNL example above, [[FamilyGuy Quagmire]] has also built up [[RapeAsComedy an immunity to mace]].
* In ''{{Metalocalypse}}'', Pickles is immune to the mind-erasing effects of Totally Awesome Sweet Alabama Liquid Snake, and pretty much every other drug as well, as the result of doing "government weed" daily since the age of 6.
* Snake Eyes in ''GIJoeRenegades'' takes multiple hits from poison darts thanks to a built up immunity. They're still enough to weaken him though.
* In one segment of [[RockyAndBullwinkle Peabody and Sherman]], Mr. Peabody used this trope to help the husband of Lucrezia Borgia.
* In ''WesternAnimation/YoungJustice'', Aqualad reveals that he is "largely immune" to the jellyfish toxin that Cheshire uses to coat her darts. Largely doesn't mean completely, though: he was weakened by it, more with each dose.
[[/folder]]

----

* Possibly in ''DoctorWho''. After the Fourth and Sixth Doctors fall to their deaths, future Doctors (especially Ten) appear to have an immunity to it.

* In ''Serenity'' this trope is used sans the poison. The government agent always paralyzes his victims by poking a cluster of nerves just before he executes them. [[spoiler: In the last fight with Mal, he uses this same method. Mal acts as if he's been paralyzed only to straighten moments later and declare that he had that nerve cluster removed years ago.]]

-->-- ''ThePrincessBride''

* The Battle of Wits scene in ''ThePrincessBride''. The Man In Black has just tricked Vizzini into consuming poisoned wine, and reveals to Buttercup that the wine he'd consumed was also poisoned; [[OutGambitted he had developed immunity to the poison via this method.]]

* In ''Series/YoungJustice'', Aqualad reveals that he is "largely immune" to the jellyfish toxin that Cheshire uses to coat her darts. Largely doesn't mean completely, though: he was weakened by it, more with each dose.

* In ''Series/YoungJustice'', Aqualad reveals that he is "largely immune" to the jellyfish toxin that Cheshire uses to coat her darts.

* Gilgamesh Wulfenbach of ''GirlGenius'' has immunity to many many things. Because his father "figures that a ruler should be... ''hard to kill''", what with the people across all the Europe who upset at killing that MadScientist or bombing this town in process... which extends to [[OverlordJr his heir]]. [[spoiler: This came in useful in the current arc where Tarvek suffered a particularly nasty disease -- Gil was able to disregard the risk of infection]].

** DarkSun boxed set DSE1 ''Dragon's Crown'', book "The Road of Fire". The poisoner Wheelock is immune to all poisons found on Athas because of years of exposure to them.

[[folder: Video Games]]
* ''{{Nethack}}'' (what else?) features varieties of poisonous meats that have a slight chance of providing permanent poison resistance when consumed. You can similarly gain resistance to heat, cold and electricity by eating certain corpses. Heck, you can even get immunity to {{Disintegrator Ray}}s that way.
** A similar {{Roguelike}} game, ''{{ADOM}}'', gives poison resistance to players who eat corpses of giant spiders.
** Subverted in yet another roguelike, Ragnarok. While it's possible to acquire poison immunity in a similar manner (though most venomous animals are still poisonous to eat), the poison of the phantom asp is so potent it has a chance to kill even through supposed "immunity."
* In ''{{Suikoden}} 2'', one country has a sighting ceremony where the knight and the ruler mix drops of their blood in a bowl and sip from it. One character builds up a tolerance until he can make his ''blood'' lethal to others.
** If I remember it correctly, Jowy took the poison and the anti-toxin, since he wouldn't have been able to develop immunity to the poison that quickly. And even with the anti-toxin, he still needed medical help afterwards.
* In ''FinalFantasy: Crystal Chronicles'', you meet the Selkie De Nam, who decides that the best way to deal with the deadly Miasma is to try to build up a resistance to it by drinking water with miasma mixed in. [[spoiler: It doesn't end well]].
* In ''LostSoulsMUD'', once you have any degree of poison resistance, exposure to poison will develop it further.
* ''NeverwinterNights'' (and D&D 3.5) has acquired poison resistance as part of the assassin class.
* There's a {{Pokemon}} ability that grants this -- Immunity. Only [[BigEater Snorlax]] and Zangoose get it, so one of them is a good ally if the opponent uses Toxic or Toxic Spikes.
* The next version of ''DwarfFortress'' is set to have this as a feature.
* One ''WorldOfWarcraft'' Horde quest has the player fight venomhide ravasaurs (basically venomous raptors) and get splashed with their toxic blood in order to become immune. This is the first step to getting a [[BraggingRightsReward venomhide ravasaur mount]].
* ''FalloutNewVegas'' allows you to build up an immunity to broken limbs. Somehow.
** Broken bones reheal stronger than before they were broken. It's one of the body's coping mechanisms, if you're going to keep getting hurt, you might as well get harder to hurt. Mind, I think it leads to arthritic problems, but y'know, you're the Courier. Either you'll retire, or die fighting.
* In ''RuneFactory3'', your protagonist has a "Poison" skill that goes up whenever he is poisoned by the enemy, or whenever he succesfully poisons one of them with an attack. One of the benefits of raising it is it makes you harder to be poisoned.
* In DragonAge Oghren has spent so many years mistreating alcohol, that he no longer suffers any negative effects from whatever he drinks. Taken further in ''Awakening'' where during the Joining ceremony, upon drinking the darkspawn blood, which typically renders the new Warden's unconscious, he merely ''burps''.
[[/folder]]

[[folder: Tabletop Games]]
* In ''WarhammerFantasy'', ogre butchers (wizards that eats all kinds of dangerous things to cast spells) have the immune to poison rule, so one would assume they have built up a very handy poison immunity.
* In the Pulp RPG ''SpiritOfTheCentury'' there is an endurance stunt called Developed Immunities that gives a + 2 to resist any poison the character hasn't previously ingested, and + 6 to any he or she has. This makes the character immune to all but the worst of poisons and unluckiest of rolls.
* Of course, ''DungeonsAndDragons'' has this trope in spades. [[PrestigeClass Assassins]] get it automatically, and Dwarfs have an innate resistance.
** Drow were quickly given this trait, because it makes sense. In ''Drow of the Underdark'' -- the first {{sourcebook}} dedicated to them -- it ranged from +4 vs. random ingested poisons to +7 vs. spiders' and their own sleep poison (it's too ubiquitous and safe to ''not'' try this).
[[/folder]]

[[folder: Webcomics]]
* In ''SomethingPositive'', Kharisma tries to kill Avagadro with cyanide, which he has built up an immunity to after being poisoned by so many people over so many years. He says that he has grown accustomed to the taste, and now puts it on his cereal.
* Gilgamesh Wulfenbach of ''GirlGenius'' has immunity to many many things. Because his father "figures that a ruler should be... ''hard to kill''", what with the people across all the Europe who upset at killing that MadScientist or bombing this town in process... which extends to [[OverlordJr his heir]]. [[spoiler: This came in useful in the current arc where Tarvek suffered a particularly nasty disease -- Gil was able to disregard the risk of infection]].
* Lifolei of ''{{Juathuur}}''... a scary, scary woman.
* ''KeychainOfCreation'': Besides disturbing quantities of alcohol, Ten Winds has reportedly been exposed to toxins, drugs and pharmaceuticals of all kinds and quantities from across [[{{Exalted}} Creation]] over his multi-century lifespan. Stack that on top of his already supernatural Exalted metabolism and you have someone who is ''very'' hard to poison.
** As illustrated [[http://keychain.patternspider.net/archive/koc0144.html here]].
* ''{{Spacetrawler}}'': Dmitri believes that a person can become immune to stun guns, and has started shooting himself repeatedly in order to acquire it. Results: [[spoiler:he acquires a taste for stun-gun shots. And immunity. In that order.]]
* ''Webcomic/TheAdventuresOfDrMcNinja'': Dan [=McNinja=] doesn't need to develop an immunity to poisons. His body separates it out and stores it up so he can squirt it out of his eyes. "Like a toad."

[[/folder]]
----

* According to DeadliestWarrior, the African warlord Shaka Zulu spat poison into his opponent's eyes during battle. He avoided its effects himself by this method, eating small pieces of the plant it came from for years. This may or may not be true.
* While you can't build up an immunity to arsenic, you can build up a ''tolerance.'' When American soldiers came to the UK in World War II those stationed in Cornwall often came down with Arsenic poisoning from the water that the locals could drink with no problems.
* The natives in San Pedro De Atacame, one of the hottest and dryest wastelands in Chile, have historically developed thousands of years worth of immunity to what little water is available. For those who don't know yet, the water is laced with up to 60 TIMES THE FATAL LEVEL OF ARSENIC! However, they are not entirely unaffected, since many develop skin lesions and sometimes cancer from this overexposure.

* African Honey Badgers. Over their life time, they develope some immunity from the poisonous snakes, scorpions, and bees they regularly prey on. In fact, a male bitten on the cheek by a highly toxic Puff adder showed signs of sever pain, but recovered fully within five hours. http://www.youtube.com/watch?v=c81bcjyfn6U

** In at least one of the animated series, Poison Ivy herself proves to be immune to the Joker's poison.

* ''TheAdventuresOfDoctorMcNinja'': Dan McNinja doesn't need to develop an immunity to poisons. His body separates it out and stores it up so he can squirt it out of his eyes. "Like a toad."

[[quoteright:237:[[DanVs http://static.tvtropes.org/pmwiki/pub/images/danteargas_1745.jpg]]]]

*** Considering Ivy can only poison people through kissing... [[SoYeah Yeah]].

* In ''TheVampireDiaries'' Katherine has built up an immunity to vervain, she can still get disabled by it if taken by surprise by a large enough dose but she gets over it much faster. Stefan uses this technique to get over his addiction to human blood.

* The A. E. Housman poem ''[[http://www.bartleby.com/123/62.html Terrence, This Is Stupid Stuff"]]'' tells about a king who over the course of his life ate small doses of poison in his food to slowly build an immunity to poisons and thus foil potential assassins. This story is used as an allegory; Housman's poem claims that the purpose of his poetry is to inoculate the reader against the evils of the world by describing them in palatable verse.