The Truth About Snakebites and Sucking Out the Venom

Karen C. asks: True or false, you should suck the venom out of a snakebite after someone gets bitten?

black-mambaThere are a number of productive things you can do to help a snakebite victim; trying to suck out the venom isn’t one of them. Actually having a negative effect, potentially further damaging the tissue around the bite and thus helping to spread the venom, trying to suck the venom out of a snakebite victim is an act in futility that simply delays proper treatment. Once in the body, snake venom quickly spreads throughout the victim’s lymphatic system, and it is just not possible for a human to suck fast or hard enough to remove enough of it to have any real positive effect.

Likewise, experts say applying a tourniquet is equally pointless (it won’t stop the venom), can add to the victim’s pain, and if left on too long, the lack of fresh blood can damage (and even kill) the limb, among other serious health issues this can introduce. Ice is also a common home treatment, but recent studies have shown that it can also make the injury much worse.

Another common misconception is that snakebites are extraordinarily fatal. In fact, even during frontier times only 25% of bites from pit vipers (think copperheads, rattlesnakes and cottonmouths) resulted in death. One reason is that some of these snakebites are “dry,” meaning no venom is injected.

Today, the worldwide rate of deaths from a snakebite is around 0.5-1% of people bitten, due in no small part to the development and distribution of effective anti-venom. For further reference, approximately 8,000 people in the U.S. are bitten by venomous snakes each year, but only about 0.2% die from it (many more people die from allergic reactions to wasp, hornet or bee stings).  This also means you are about nine times more likely to die from being struck by lightning than die from being bitten by a snake in the United States.  Even in Australia where seemingly everything in nature seems capable of killing humans and where 7 out of the world’s 10 deadliest snakes live, there is only about 1 death by a snake bite per year on average.

So what should you do when you encounter a snakebite? Several things, depending on your circumstances.

  • Protect the person by carefully moving her away from the snake (and making sure not to get bitten yourself). At the same time, try to note the snake’s appearance (so emergency responders will know better how to treat the bite).
  • Call emergency responders or at the least get to a hospital. The former is preferred so that the victim can simply lay there and relax, to slow their heart rate and perform other helpful actions which we’ll get to presently.
  • If you’re transporting, or are, the victim, and the bite is to a limb, depending on circumstance, a splint to reduce muscle contractions can also be helpful.
  • If you are stuck in the wilderness and the victim will have to walk out, first have her sit quietly for a while until fully relaxed. This helps to keep the venom localized in one place. Then get walking, but at a calm, leisurely pace.
  • In the interim between getting the needed medical aid, try to keep the victim as still as possible to limit the spread of the venom. This includes avoiding stimulants and other products that either thin the blood or accelerate the heart, such as alcohol, aspirin, coffee and cigarettes.
  • If possible, it is also helpful to have the victim lie down, keeping the affected area (usually a limb) lower than the heart. Cover the victim with a blanket and loosen tight clothing. In particular, remove anything constricting from the effective area, like a shoe or jewelry (bracelets and rings, in particular). The bitten extremity will swell and such jewelry may then become a source of significant pain if not removed.
  • The bite area should also be washed with soap and water or otherwise disinfected, to help reduce the chance of infection.

It should also be noted that while bites from copperheads, rattlesnakes and cottonmouths are sufficiently painful from the start that the victim will ask for assistance, with coral snakes, some victims have made the mistake of thinking the bite caused little harm. According to the National Library of Medicine, it is common for symptoms from the venomous bite of a coral snake to take several hours to appear.

While you’ll usually be fine, so long as you receive proper medical care after being bitten, there is the notable exception of the Black Mamba. Residing in certain parts of Africa, you’ll want to avoid these at all costs. The Black Mamba’s kill rate after a strike is 100% unless very large amounts of anti-venom (typically 10-12 vials) are administered very shortly after being bitten. You don’t have a lot of time with this one.  Given how quickly its venom can kill (as quickly as 10 minutes, though sometimes it takes a few hours, depending on how much is injected; the average time until death after a bite is around 30-60 minutes), around 95% of people still die from Black Mamba bites usually due to being unable to get the anti-venom administered in time.  For reference, one single strike from a Black Mamba will deliver around 100-400 mg of venom and only 10-15 mg is needed to kill a human.

They also usually won’t just strike once, but will continually strike whatever is threatening them as much as they safely can before it stops moving.  If it’s a large, dangerous animal they’re striking, they may only strike a few times in quick succession, then may or may not follow the animal until it dies. If they do follow, they usually will continue to strike only when they see safe opportunities.  As you might expect from this, Black Mamba’s are near top of the food chain, outside of humans.

What’s particularly frightening about this snake, apart from being amazingly deadly and 8-14 feet long, is that the Black Mamba can also move as fast as 14 mph, with an average top speed in the range of 10 mph to 12 mph.  In either case, this makes them the fastest snake in the world.  They can also maintain speeds of around 6-7 mph for lengthy periods.

If all this wasn’t bad enough, the Black Mamba is considered to be the most aggressive snake in the world.  However, it should be noted that even having the reputation of being extremely aggressive, it usually only attacks humans when it feels cornered or when a female is protecting her eggs.  When it does feel like fighting, it’s incredibly fearsome.  Because of its size, ground speed, and agility; how quickly it can strike; how fearless it can appear to be; and how deadly its venom is (I for one welcome our new Black Mamba overlords), it generally takes a group of people working together to kill one, and even then it’s a dangerous endeavor. So you’ll not want to encounter one of these alone, whether on land or in the water.  In both cases, best to have someone with you that you can run faster than!

If you liked this article, you might also enjoy our new popular podcast, The BrainFood Show (iTunes, Spotify, Google Play Music, Feed), as well as:

Bonus Facts:

  • A simple way to determine if a snake that has bitten you is venomous or not is that usually venomous snakes will leave two fairly deep puncture wounds after they’ve struck.  Nonvenomous snakes, on the other hand, will generally leave small, very shallow punctures in a horseshoe shape.
  • Another interesting kind of snake is the Chrysopelea, also known as the “flying snake”.  This snake actually can fly, after a fashion.  It has the ability to use scales on its belly to climb straight up trees.  Once it’s high enough, it will dangle from a tree branch.  It then selects a target and bends itself into a J.  Finally, it flings itself away from the tree towards its target and sucks in its stomach and flares out its ribs, creating a sort of flying torpedo, with lateral undulation (not unlike the way snakes move through water). Combined with the way they shape their body, this lateral undulation actually creates lift, allowing them to glide.   They are capable of making flights as long as 100 meters doing this.
  • Rattlesnakes are able to make a rattling noise because their tails are comprised of 6-10 layers of scales.  When these layers of scales are shaken, they rattle.
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  • On the subject of snakes, I read (could be on this site, could be somewhere else) that if a cobra is angry and rearing up to bite you, throw a hat, shirt anything light on the ground in the middle of you and the snake, then back away slowly maintaining eye contact.

  • Good article – except the black mamba facts are a little exaggerated.

    • No they’re not.

      • They really are though. Black Mambas (just like other elapids and vipers) can control the amount of venom they inject and do give dry bites which means little to no symptoms would present. The death rate is not 95% by recorded bites in the last 10 years (and most fatal bites are a result of not seeking modern medical care and instead relying on traditional medicine). Even then it’s not 100% fatal because dose is the most important factor and there are many ways someone could receive a less than fatal dose. These cases are usually not reported. So we don’t know the actual number. But it’s not 100% (no snake bite is). The author also greatly undersells how many people die worldwide from snakebite. It’s thought to be around 100,000 with morbidity (Loss of limb or other permanent disability is several times higher). Most of these are from Russel’s vipers, sawscale vipers, naja (common or Indian cobra) and common Krait. All of these snakes have available antivenins but the locations of most fatalities are in Northern Africa and Southern Asia where medical care is often not sought or available. This makes snakebites a massively undertreated tropical illness and ranks behind only mosquitoes in terms of worldwide deaths caused directly by a type of animal.

  • so what happens if you cant get to an outside source of help? die? this just says “go to the hospital and drop 14k on antivenom”

  • While I enjoyed the article, I couldn’t find any credentials or much info at all on the author. I only managed to find a list of other articles she’s written.
    Where does this information come from and how do we know the author knows what she’s talking about?

    • It’s in the title of the site. “Today I found Out: Feed Your Brain” This article is about information learned not about BS cobbled together just for views. This kind of information is easily found on any Hospital or legitimate medical information site on the web. It would stupid for the author to write incorrect information on something that can literally be found in less than three seconds by typing in a hospital’s information site; which I did. Along with some stuff from WebMD as well. It took me longer to write this up than it did to find and read up on what this Author wrote about.

      In short the only thing this Author has done is turn some rather dry information into something a bit more entertaining to read.


      “The evidence suggests that cutting and sucking, or applying a tourniquet or ice does nothing to help the victim,” says Robert A. Barish, MD, an emergency room physician and associate dean for clinical affairs at the University of Maryland School of Medicine, in a news release.

      Of the estimated 120 different types of snakes found in the U.S., about 20 are poisonous. Although most bites occur the southwest part of the nation, at least one type of poisonous snake has been identified in every state except Alaska, Hawaii, and Maine.

      Some of the most commonly found venomous snakes are pit vipers, such as rattlesnakes, cottonmouths, and copperheads.

      Researchers say many people believe that any bite from a poisonous snake will lead to illness or death. But that’s no longer the case.

      About 25% of all pit viper bites are “dry” and don’t contain any of the snake’s dangerous venom. In addition, since the advent of effective antivenom, the death rate from pit viper bites has dropped to less than one half of one percent. Back in the frontier days of the 19th century, up to 25% of these snakebites were fatal.

      Mayo Clinic First Aide Snake Bites:

      Most snakes aren’t dangerous to humans. Only about 15% worldwide and 20% in the United States are venomous. In North America, these include the rattlesnake, coral snake, water moccasin and copperhead. Their bites can cause severe injuries and sometimes death.

      If a venomous snake bites you, call ‪911‬ or your local emergency number immediately, especially if the bitten area changes color, begins to swell or is painful. Many emergency rooms stock antivenom drugs, which may help you.

      If possible, take these steps while waiting for medical help:

      * Move beyond the snake’s striking distance.

      * Remain still and calm to help slow the spread of venom.

      * Remove jewelry and tight clothing before you start to swell.

      * Position yourself, if possible, so that the bite is at or below the level of your heart.

      * Clean the wound with soap and water. Cover it with a clean, dry dressing.


      * Don’t use a tourniquet or apply ice.

      * Don’t cut the wound or attempt to remove the venom.

      * Don’t drink caffeine or alcohol, which could speed your body’s absorption of venom.

      * Don’t try to capture the snake. Try to remember its color and shape so that you can describe it, which will help in your treatment. If you have a smartphone with you and it won’t delay your getting help, take a picture of the snake from a safe distance to help with identification.


      Most snakebites occur on the extremities. Typical symptoms of the bite from a nonvenomous snake are pain and scratches at the site.

      Usually, after a bite from a venomous snake, there is severe burning pain at the site within 15 to 30 minutes. This can progress to swelling and bruising at the wound and all the way up the arm or leg. Other signs and symptoms include nausea, labored breathing and a general sense of weakness, as well as an odd taste in the mouth.

      Some snakes, such as coral snakes, have toxins that cause neurological symptoms, such as skin tingling, difficulty speaking and weakness.
      Sometimes, a venomous snake can bite without injecting venom. The result of these “dry bites” is irritation at the site.

      Venomous snakes in North America

      Most venomous snakes in North America have eyes like slits and are known as pit vipers. Their heads are triangular and they have fangs. One exception is the coral snake, which has a rounded head and round pupils. Nonvenomous snakes typically have rounded heads, round pupils and no fangs.