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Snake and Lizard Bites - Topic Overview

A bite from a poisonous (venomous) snake or lizard requires emergency care. If you have been bitten by a snake or lizard that you know or think might be poisonous, call911or other emergency services immediately. Do not wait for symptoms to develop.

If you are not sure what type of snake or lizard bit you, call the Poison Control Center immediately to help identify the snake or lizard and find out what to do next. Medicine to counteract the effects of the poison (antivenom) can save a limb or your life.

It is important to stay calm.

Poisonous snakes or lizards found in North America include:

Maine, Alaska, and Hawaii are the only states that don't have at least one poisonous snake species in the wild.

Symptoms of a pit viper snakebite often appear from minutes to hours after a bite. Severe burning pain at the site usually begins within minutes, and then swelling starts spreading out from the bite.

Things that affect the severity of a poisonous snake or lizard bite include the:

  • Type and size of the snake or lizard.
  • Amount of venom injected (if any).
  • Potency of the venom injected.
  • Location and depth of the bite.
  • Number of bites and where they occurred on the body.
  • Age, size, and health of the person who was bitten.

If you do not develop symptoms within 8 to 12 hours, it is possible that no venom was injected; this is called a dry bite. At least 25%, and perhaps up to 50%, of bites are dry. If poison is released in the bite, about 35% of the bites have mild injections of poison (envenomations), 25% are moderate, and 10% to 15% are severe.

It is important to remember that a snake only injects part of its venom with each bite, so it is still dangerous after the first strike. A bite from a young snake can be serious. And a dead snake, even one with a severed head, can still bite and release venom by reflex action for up to 90 minutes after it dies. Even if you do not develop symptoms within 8 hours, continue to watch for symptoms for 2 weeks or more.

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