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Rattlesnake Antivenin

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Rattlesnake Antivenin

SIDE EFFECTS

Immediate systemic reactions (allergic reactions or anaphylaxis) can occur whenever a horse-serum-containing product is administered. An immediate reaction (e.g. shock, anaphylaxis) usually occurs within 30 minutes. Symptoms and signs may develop before the needle is withdrawn and may include apprehension, flushing, itching, urticaria; edema of the face, tongue, and throat; cough, dyspnea, cyanosis, vomiting, and collapse. There have been isolated reports of cardiac arrest and death associated with Antivenin (Crotalidae) Polyvalent (equine origin) use. However, serious immediate reactions to Antivenin are rare. In skin-test-negative patients, Antivenin caused a true immediate sensitivity reaction in less than 1 percent of patients.10

Serum sickness usually occurs 5 to 24 days after administration and its frequency may be related to the number of Antivenin vials administered.30 The incubation period may be less than 5 days, especially in those who have received horse-serum-containing preparations in the past. The usual symptoms and signs are malaise, fever, urticaria, lymphadenopathy, edema, arthralgia, nausea, and vomiting. Occasionally, neurological manifestations develop, such as meningismus or peripheral neuritis. Peripheral neuritis usually involves the shoulders and arms. Pain and muscle weakness are frequently present, and permanent atrophy may develop.

Read the Rattlesnake Antivenin (antivenin (crotalidae) polyvalent) Side Effects Center for a complete guide to possible side effects

DRUG INTERACTIONS

Therapy with beta-adrenergic blockers, including cardioselective agents, has been associated with an increased severity of acute anaphylaxis.

Anaphylaxis may be prolonged and resistant to conventional treatment in patients receiving beta-adrenergic blockers. The pharmacotherapeutic actions of epinephrine and other adrenergic agents may be altered, and larger than usual doses may be required.15

REFERENCES

10. RUSSEL, F.: Snake venom poisoning. Scholium International, Inc., New York, 1983.

15. TOOGOOD, J.: Beta-blocker therapy and the risk of anaphylaxis. Can. Med. Assoc. J. 136:929,1987.

30. LAWRENCE, W. et al: Pitviper bites: Rational management in which Copperheads and Cottonmouths predominate. Annals of Plastic Surg. 36(3): 276, 1996.

Last reviewed on RxList: 10/2/2008
This monograph has been modified to include the generic and brand name in many instances.

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