Snakebite First Aid: Get to Antivenom Now, and What Never to Do

01

What do I do in the first ten minutes?

Get the person to a hospital that stocks antivenom, immediately, and do nothing that delays that. Call the emergency number now, and if you can, have someone call the hospital ahead so antivenom is ready when you arrive. WHO's regional guidelines put the whole of first aid in that order - reassure the person, slow the spread of venom, keep them alive and free of complications until medical care is reached, control the early symptoms, and arrange transport to a place that can treat them - under an over-riding instruction they print in capital letters: aim to do no harm. Everything below serves the journey. None of it replaces the journey.

In practice that means: reassure the person, because fear and excitement raise the heart rate and speed the spread of venom. Lay them down in a comfortable, safe position, ideally the recovery position, lying on the left side in case vomiting threatens. Immobilise the bitten limb with a splint or a sling. Remove rings, bangles and tight clothing before swelling starts. Give no alcohol as a painkiller and no pain relievers such as aspirin, ibuprofen or naproxen, all of which CDC's guidance for outdoor workers rules out. Then move. MedlinePlus is blunt about the commonest fatal mistake: do not wait for symptoms to appear if bitten, seek immediate medical attention. CDC says the same - do not wait for symptoms to appear, get medical help right away.

02

Never cut, suck, ice, shock or tie a band: why each one harms

Because they have been studied, and they do not work. WHO's regional guidelines state that most of the traditional, popular, available and affordable first aid methods have proved to be useless or even frankly dangerous, and they name them: making local incisions or pricks at the site of the bite or in the bitten limb, attempts to suck the venom out of the wound, use of black snake stones, tying tight bands around the limb, electric shock, and topical instillation or application of chemicals, herbs or ice packs. The guidelines add that people may have great confidence in traditional herbal treatments, but that these must not be allowed to delay medical treatment or to do harm.

The tourniquet is the one that maims. WHO's guidelines say tight arterial tourniquets must never be recommended or condoned: tied around the upper limb they are extremely painful as the limb becomes ischaemic, are very dangerous if left in place for long, and many gangrenous limbs have resulted. A clinical review reaches the same conclusion - a tourniquet above the bite raises morbidity without improving outcomes, venom extractors are ineffective, and incision or washout of the bite is not suggested. CDC's do-not list covers tourniquets, electric shock, folk therapies, slashing the wound, sucking out venom, ice or immersion in water, and alcohol or painkillers such as aspirin or ibuprofen.

03

What if a tight band has already been tied?

Do not untie it yourself, and this is the one instruction that surprises people. WHO's regional guidelines carry an explicit caution: if the patient has already applied tight bands, bandages or ligatures, they should not be released until the patient is under medical care in hospital, with medical staff and resuscitation facilities available and antivenom treatment already started. Releasing a band that has been dammed against a load of venom can send it into the circulation all at once, in a place with no equipment and no antidote. Tell the hospital staff it is there and when it was applied, and let them take it off.

Leave the bite wound itself alone. WHO's guidelines say to avoid any interference with it - no incisions, rubbing, vigorous cleaning, massage, or application of herbs or chemicals - because these can introduce infection, increase absorption of venom and increase local bleeding. Guidance is not identical here: CDC's advice for outdoor workers does include gently washing the bite with soap and water and covering it with a clean dry dressing while transport is arranged, and it suggests marking the edge of the swelling and writing the time next to it so the hospital can see how fast it is spreading. What no guideline does is treat the wound as the thing that matters.

04

How should the person and the bitten limb be moved?

As little as possible, and never on their own feet. WHO's regional guidelines are specific about why: any movement or muscular contraction, even undressing or walking, will increase absorption and spread of venom by squeezing veins and lymphatics. So the whole body is immobilised by laying the person down, the bitten limb is splinted or slung, and during transport any movement, especially of the bitten limb, must be reduced to an absolute minimum. Carry the person. Where an ambulance is not available, the guidelines accept a stretcher, bicycle, motorbike, cart, horse, train or boat, and describe village motorcycle volunteers carrying victims propped upright between a driver and a pillion passenger.

Pressure immobilisation is where guidance genuinely differs, and it is also the one thing on this page that a bystander must not improvise. It is a trained technique needing proper equipment. A cloth, belt, scarf or rope pulled tight at the roadside is not a pressure bandage: it is a tourniquet, with everything that follows. Splint the limb, tie nothing tight, and go. Both positions, for the record: WHO's regional guidelines say that unless an elapid bite can confidently be excluded, pressure-pad immobilisation is applied, or pressure-bandage immobilisation where the equipment and skills exist; they note the bandage method has not become widely used in this region because the long elasticated bandages, training and skill needed have proved impossible to provide, and that the pad method is preferred as simpler.

A clinical review of snake envenomation takes a narrower line still, considering a pressure bandage only where the snake species is known to cause neurotoxicity without local tissue damage, and warning that where the venom damages tissue a pressure bandage may make that damage worse. The same review says first aid at the scene should be minimal and aimed at getting the person to the nearest treatment centre quickly, with splinting considered only where it will not delay transport. Minimal, and already moving, is the safe reading of all of it.

05

What should I note about the snake, without ever chasing it?

Note it from where you are standing and then leave. WHO's regional guidelines say do not attempt to kill the snake, as this may be dangerous; if it has already been killed it can be taken to the hospital, but it must not be handled with bare hands, because even a severed head can bite. Several close-up mobile phone images taken from a safe distance may allow expert identification, but never hold up the journey for a photograph and never step closer to take one. MedlinePlus adds the two practical warnings: do not waste time hunting for the snake, do not trap it or pick it up, and if it is dead be careful of the head, because a snake can bite by reflex for several hours after death.

Do not let identification decide anything. WHO's regional guidelines advise not relying on patients or relatives to identify snakes, since identification is poor, and warn that envenoming should not be excluded by the absence of fang marks: in one series 3.8% of people without fang marks were envenomed, and krait bites in particular can be hard to see even shortly after the bite. Among people who could not say what bit them, 14% were envenomed. The guidelines also ask clinicians to consider snakebite behind unexplained altered consciousness, changed speech or swallowing, or abdominal pain, especially in the rainy season. Tell the doctor the time of the bite, where on the body, and what you were doing.

06

What happens at hospital, and why is antivenom the only treatment that works?

Antivenom is the only specific antidote to snake venom. WHO's regional guidelines call it a life-saving, WHO-recognised essential medicine and the only effective antidote for envenoming. Nothing else neutralises circulating venom: not a drug, not a drip, not surgery. WHO estimates 1.8 to 2.7 million envenomings a year worldwide from about 5.4 million bites, with roughly 81 410 to 137 880 deaths and around three times as many amputations and other permanent disabilities. Agricultural workers and children are the most affected, and children often suffer more severe effects than adults because of their smaller body mass.

Being in hospital does not automatically mean being given antivenom, and that is deliberate. WHO's regional guidelines say antivenom should be given only to patients showing signs of envenoming, because giving it without them exposes people to adverse reactions and is costly where demand already exceeds supply. That decision belongs in a place that holds antivenom and can watch the person hour by hour, and it is the opposite of a reason to stay at home: the hospital watches and tests. The bedside test here is the 20-minute whole blood clotting test: two millilitres of fresh venous blood in a new, dry, ordinary glass vessel, left undisturbed for twenty minutes, then tipped once. If the blood is still liquid and runs out, it is incoagulable, which in this region is diagnostic of a viper bite and rules out an elapid one.

07

Could it have been a dry bite? Not a question to answer at home

It could have been - and nothing at the scene, and nothing in the first hours, tells you which kind of bite you have had. Bites in which a venomous snake's fangs pierce the skin but no envenoming follows are called dry bites, and WHO's regional guidelines put the overall figure at about half of all bites by venomous snakes, with the proportion varying widely by species - around 50% for some vipers, about 30% of cobra bites, and 5 to 10% of bites by saw-scaled vipers. Half is not a comforting number when the other half is the half that kills, and there is no way to sort yourself into one of them without being watched. The guidelines list the possibility of a dry bite among the honest grounds for reassuring a frightened person, alongside the usually slow evolution of severe envenoming, which allows time for treatment. Reassurance is a first-aid measure precisely because it slows the heart rate. It is not a discharge decision, and it is not a reason to turn back.

Feeling well early proves nothing, because several venoms take hours to declare themselves. MedlinePlus warns about exactly this pattern with elapid bites in its own region: major symptoms may not develop for hours, and it tells readers not to think they will be fine because the bite area looks good and there is little pain. WHO's regional protocol for a rural clinic is to assess swelling, tender lymph glands, bleeding from the wound, blood pressure, pulse, bleeding from gums, nose, vomit, stool or urine, consciousness, drooping eyelids and other signs of paralysis - and to monitor those signs hourly. That hourly watch is what you are going for.

08

Which signs mean the venom is acting?

The nerve signs come in a recognisable order and each one is an emergency. WHO's regional guidelines list drowsiness, pins and needles, abnormalities of taste and smell, heavy eyelids and then ptosis, meaning drooping eyelids that cannot be held open, followed by loss of eye movement, paralysis of facial and other muscles supplied by the cranial nerves, a nasal voice or no voice at all, food or fluid coming back through the nose, difficulty swallowing secretions, and finally respiratory and generalised flaccid paralysis. The greatest fear in these guidelines is that someone develops fatal respiratory paralysis or shock before reaching a place where they can be resuscitated.

The other two patterns are bleeding and muscle breakdown. Venom-induced clotting failure shows as spontaneous bleeding from gums, nose, vomit, stool or urine, and as fresh bleeding from old partly healed wounds; laboratory signs include incoagulable blood on the bedside test, an INR above 1.2 or a prothrombin time four to five seconds longer than control, and a low platelet count.

Muscle breakdown shows as generalised muscle pain, stiffness and tenderness, pain on passive stretching, difficulty opening the jaw, and dark brown or black urine, which often travels with acute kidney injury and a rising creatinine. Locally, watch for swelling spreading over more than half the bitten limb within 48 hours without a tourniquet, swelling after a bite on a finger or toe, or swelling past the wrist or ankle within hours.