CroFab Side Effects
Generic Name: antivenin (crotalidae) polyvalent
Note: This page contains information about the side effects of antivenin (crotalidae) polyvalent. Some of the dosage forms included on this document may not apply to the brand name CroFab.
Not all side effects for CroFab may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.
For the Consumer
Applies to antivenin (crotalidae) polyvalent: intravenous powder for solution
In addition to its needed effects, some unwanted effects may be caused by antivenin (crotalidae) polyvalent (the active ingredient contained in CroFab). In the event that any of these side effects do occur, they may require medical attention.
You should check with your doctor immediately if any of these side effects occur when taking antivenin (crotalidae) polyvalent:More common
- Unexplained bleeding or bruising
- difficulty in breathing
- difficulty in swallowing
- dizziness or lightheadedness
- fast heartbeat
- hives or welts
- itching of skin
- joint pain
- large, hive-like swellings on the eyelids, face, lips, mouth, and/or tongue
- muscle pain
- noisy breathing
- redness of skin
- shortness of breath
- skin rash
If any of the following side effects occur while taking antivenin (crotalidae) polyvalent, check with your doctor or nurse as soon as possible:Less common
- Areas of pain, redness, and swelling
- chest pain
- discharge from wound
- pain, tenderness, and warmth at wound site
- unusual tiredness or weakness
Some of the side effects that can occur with antivenin (crotalidae) polyvalent may not need medical attention. As your body adjusts to the medicine during treatment these side effects may go away. Your health care professional may also be able to tell you about ways to reduce or prevent some of these side effects. If any of the following side effects continue, are bothersome or if you have any questions about them, check with your health care professional:More common
For Healthcare Professionals
Applies to antivenin (crotalidae) polyvalent: injectable solution
Hypersensitivity reactions have included immediate systemic reactions such as anaphylaxis and shock, characterized by apprehension, flushing, itching, urticaria, edema of the face, tongue, and throat, cough, dyspnea, cyanosis, vomiting, and collapse. Cardiac arrest and death have been reported rarely. Immediate-hypersensitivity reactions occurred in less than 1% of patients with negative skin tests.
Serum sickness may occur 5 to 24 days after administration of antivenin. Symptoms may include fever, malaise, urticaria, lymphadenopathy, edema, arthralgia, nausea, vomiting, meningismus, peripheral neuritis, pain, muscle weakness, and permanent atrophy. Serum sickness may occur within less than 5 days, especially in patients who have previously received horse serum. Its frequency may be related to the number of vials the patient has received.[Ref]
Nervous system side effects have included meningismus, peripheral neuritis, pain, circumoral paresthesia, general paresthesia, nervousness, and permanent atrophy.[Ref]
Hematologic side effects have included coagulation disorder and ecchymosis.
Cardiovascular side effects have included hypotension.[Ref]
Dermatologic side effects have included rash and subcutaneous nodule.[Ref]
Respiratory side effects have included asthma, cough, and increased sputum.
Musculoskeletal side effects have included myalgia and muscle weakness.
Gastrointestinal side effects have included nausea and anorexia.
Other side effects have included back pain, chest pain, cellulitis, wound infection, and chills.
1. Cannon R, Ruha AM, Kashani J "Acute Hypersensitivity Reactions Associated With Administration of Crotalidae Polyvalent Immune Fab Antivenom." Ann Emerg Med (2008):
2. "Product Information. Crofab (antivenin (crotalidae) polyvalent)" Savage Laboratories, Melville, NY.
More about CroFab (antivenin (crotalidae) polyvalent)
Related treatment guides
Disclaimer: Every effort has been made to ensure that the information provided is accurate, up-to-date and complete, but no guarantee is made to that effect. In addition, the drug information contained herein may be time sensitive and should not be utilized as a reference resource beyond the date hereof. This material does not endorse drugs, diagnose patients, or recommend therapy. This information is a reference resource designed as supplement to, and not a substitute for, the expertise, skill , knowledge, and judgement of healthcare practitioners in patient care. The absence of a warning for a given drug or combination thereof in no way should be construed to indicate safety, effectiveness, or appropriateness for any given patient. Drugs.com does not assume any responsibility for any aspect of healthcare administered with the aid of materials provided. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the substances you are taking, check with your doctor, nurse, or pharmacist.