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Antivenin (Latrodectus Mactans) Side Effects

Generic name: antivenin (black widow spider)

Medically reviewed by Last updated on Feb 8, 2022.

Note: This document contains side effect information about antivenin (black widow spider). Some of the dosage forms listed on this page may not apply to the brand name Antivenin (Latrodectus Mactans).

For the Consumer

Applies to antivenin (black widow spider): parenteral powder for injection

Side effects include:

Sensitivity reactions, muscle cramps.

For Healthcare Professionals

Applies to antivenin (black widow spider): injectable powder for injection


Frequency not reported: Hypersensitivity reactions including anaphylaxis and serum sickness[Ref]


Frequency not reported: Muscle cramps

More about Antivenin (Latrodectus Mactans) (antivenin (black widow spider))

Patient resources

Professional resources

Related treatment guides


1. "Product Information. Antivenin (Latrodectus mactans) (antivenin (black widow spider))." Merck & Company Inc (2022):

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.