antivenom

Antivenom serum is a specialized medication used to treat envenomation from venomous animal bites and stings. It contains antibodies that neutralize venom toxins and is primarily produced from immunized animals like horses, sheep, and goats. ## Composition and Mechanism Antivenom serum works by binding to and neutralizing venom toxins in the body. It contains venom-specific F(ab')2 fragments of immunoglobulin G (IgG) that facilitate the redistribution of toxins away from target tissues and their elimination from the body[1][8]. The production process involves: 1. Immunizing host animals (horses, donkeys, goats, sheep, rabbits, chickens, llamas, or camels) with small amounts of venom[1][3] 2. Collecting antibodies released by the animal's immune system[3] 3. Harvesting blood serum or plasma through bleeding[3] 4. Concentrating and purifying the serum into pharmaceutical-grade antivenom[3][5] ## Medical Uses Antivenom serum is indicated for: - Treatment of venomous snake bites[1][4][6] - Spider bites[1] - Scorpion stings[1] - Fish stings[1] It is recommended only when there is significant toxicity or a high risk of toxicity[1]. For optimal results, antivenom should be administered as soon as possible after envenomation, typically within the first 4 hours, though it may remain effective for up to 2 weeks after the bite[4][10]. ## Types and Administration Different antivenoms are available for specific venomous species. The medication is administered by injection, with dosing based on the severity of envenomation and patient response[1][6]. Severity categories include: - Dry bites (no venom injected) - do not require antivenom - Mild envenomation - slight bleeding, pain, and swelling at the bite site - Moderate envenomation - severe pain, swelling of the whole limb, and general illness - Severe envenomation - severe pain and swelling, breathing difficulties, moderate to severe bleeding, and shock[4][10] ## Side Effects and Complications Potential side effects of antivenom serum include: - Serum sickness (delayed reaction occurring days or weeks after treatment) - Shortness of breath - Allergic reactions including anaphylaxis - Rash, itching, wheezing - Rapid heart rate, fever, and body aches[1][4][10] ## Production Advancements Due to the high cost and short shelf life of traditional antibody-based antivenoms, alternative production methods are being explored: - Bacterial production systems - Development of targeted synthetic drugs - Purification techniques using caprylic acid instead of ammonium sulfate precipitation, which can improve purity and reduce adverse reactions[1][5] Antivenom remains the only effective treatment option for many dangerous animal envenomations, making it an essential medication on the World Health Organization's List of Essential Medicines[1].

Brand names

ANAVIPCroFab

Other names

antiveninvenom antiserumantivenom immunoglobulin