Antivenin (Micrurus fulvius) (Injection)


Antivenin (Micrurus Fulvius) (an-tee-VEN-in (mye-KROO-rus FUL-vi-us))

Treats poisoning caused by the bite of a North American coral snake.

When This Medicine Should Not Be Used

You should not receive this medicine if you have had an allergic reaction to antivenin, or if you have any history of allergy to horses or any products that come from horses. You should not receive morphine or other narcotic pain medicines if you are receiving this medicine.

Drugs and Foods to Avoid

Ask your doctor or pharmacist before using any other medicine, including over-the-counter medicines, vitamins, and herbal products.

  • Make sure your doctor knows if you are using beta blockers (such as atenolol, metoprolol, propranolol, or Toprol®) and other blood pressure medicines.
  • Tell your doctor if you drink alcohol or if you are using any medicine that makes you sleepy, such as allergy medicine or narcotic pain medicine.

Warnings While Using This Medicine

  • Make sure your doctor knows if you are pregnant or breastfeeding, or if you have asthma, hay fever, or hives.
  • Your doctor will need to perform a skin test to see if you are at risk of having a serious reaction to this medicine.

Brand Name(s)


There may be other brand names for this medicine.

How to Use This Medicine


  • Your doctor will prescribe your dose and schedule. This medicine is given through a needle placed in a vein.
  • A nurse or other health provider will give you this medicine. This medicine is given slowly, so the needle may remain in place for an hour or longer.
  • Your care providers will need to watch you closely during your treatment. This is to make sure the medicine is working and does not cause serious side effects.

Possible Side Effects While Using This Medicine

Call your doctor right away if you notice any of these side effects:

  • Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing
  • Fever.
  • Headache, stiff neck, vision changes.
  • Lightheadedness or fainting.
  • Numbness, tingling, or burning pain in your shoulders, hands, arms, legs, or feet.
  • Pain, itching, burning, swelling, or a lump under your skin where the needle is placed.
  • Shortness of breath, bluish-colored skin, or cough.
  • Swelling in your hands, ankles, or feet.
  • Warmth or redness in your face, neck, arms, or upper chest.

If you notice these less serious side effects, talk with your doctor:

  • Enlarged lymph nodes, or lumps on your neck, armpit, or groin.
  • Joint pain.
  • Muscle pain or weakness.
  • Nausea or vomiting.

If you notice other side effects that you think are caused by this medicine, tell your doctor

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088

Review Date: March 4, 2014
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites.
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