Pit Viper Antivenin
Also known as: CroFab, Antivenin
> **Medical Emergency**: Snakebites are life-threatening emergencies. Immediate veterinary intervention is required. * **High Cost**: Antivenin therapy is very expensive. Depending on the severity of the bite and the size of your pet, multiple vials may be necessary. * **Intensive Care**: Treatment involves more than just the antivenin. Your pet will likely require hospitalization, aggressive IV fluid therapy, pain management, and continuous monitoring. * **Allergic Reactions**: Because the antivenin is derived from horse or sheep proteins, there is a risk of severe allergic reactions (anaphylaxis) during administration, or delayed reactions (serum sickness) days to weeks later. Your veterinarian will monitor closely for these complications.
Dosage must be set by your veterinarian for your specific pet. Never give human medication or another pet’s prescription without veterinary guidance.
What it is used for
- Pit viper envenomation
- Systemic effects of envenomation
- Pit viper envenomation
- Pit viper envenomation
How it is given
Possible side effects
- Anaphylaxis (Type I hypersensitivity)
- Anaphylactoid reactions
- Serum sickness (Type III hypersensitivity, delayed)
- Nausea
- Pruritus
- Hyperemia of the inner pinna
Cautions & contraindications
- Known severe hypersensitivity to equine or ovine proteins (relative contraindication in life-threatening envenomation)
- High risk of anaphylaxis due to equine-origin proteins. A test dose (1:10 dilution intracutaneously) is sometimes suggested but evaluation is difficult. Slow IV administration is usually sufficient to identify reactive animals. Pre-treatment with diphenhydramine is highly recommended to sedate the patient and reduce allergic reactions. If an anaphylactoid reaction occurs (nausea, pruritus, pinna hyperemia), stop the infusion, administer additional diphenhydramine, and restart 5 minutes later at a slower rate.
Drug interactions
- Analgesics/Sedatives: May mask the clinical signs associated with the venom; use with caution initially.
- Antihistamines: Theoretical risk of potentiating venom, though diphenhydramine is routinely and safely used by clinicians for pre-treatment.
- Beta-blockers: May mask the early signs associated with anaphylaxis.
- Corticosteroids: Generally out of favor for treating snakebite envenomation, but may be useful to treat secondary anaphylaxis. Contraindicated in horses per some references.
- Heparin: Reportedly not effective in treating the thrombin-like enzymes found in rattlesnake venom.
Frequently asked questions
What is Pit Viper Antivenin used for in pets?
> **Medical Emergency**: Snakebites are life-threatening emergencies. Immediate veterinary intervention is required. * **High Cost**: Antivenin therapy is very expensive. Depending on the severity of the bite and the size of your pet, multiple vials may be necessary. * **Intensive Care**: Treatment involves more than just the antivenin. Your pet will likely require hospitalization, aggressive IV fluid therapy, pain management, and continuous monitoring. * **Allergic Reactions**: Because the antivenin is derived from horse or sheep proteins, there is a risk of severe allergic reactions (anaphylaxis) during administration, or delayed reactions (serum sickness) days to weeks later. Your veterinarian will monitor closely for these complications.
Is Pit Viper Antivenin safe for my pet?
Dosage must be set by your veterinarian for your specific pet. Never give human medication or another pet’s prescription without veterinary guidance.
This article is for general education and is not a substitute for professional veterinary advice. If your pet is unwell, please consult a veterinarian.
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