Skip to main content

Antivenin (Latrodectus Mactans) Side Effects

Generic name: antivenin (black widow spider)

Medically reviewed by Last updated on Sep 26, 2023.

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

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

Serious side effects

Along with its needed effects, antivenin (black widow spider) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor or nurse immediately if any of the following side effects occur while taking antivenin (black widow spider):

Incidence not known

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))

Professional resources

Related treatment guides


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

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.