Skip to main content

Antivenin (black widow spider) Side Effects

Medically reviewed by Last updated on Feb 8, 2022.

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 (black widow spider)

Patient resources

Other brands

Antivenin (Latrodectus Mactans)

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.