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Antizol Side Effects

Generic name: fomepizole

Medically reviewed by Last updated on Aug 23, 2021.

Note: This document contains side effect information about fomepizole. Some of the dosage forms listed on this page may not apply to the brand name Antizol.

In Summary

Common side effects of Antizol include: headache and nausea. Other side effects include: dizziness. See below for a comprehensive list of adverse effects.

For the Consumer

Applies to fomepizole: parenteral injection concentrate for iv infusion

Side effects include:

Headache, nausea, dizziness, increased drowsiness, bad/metallic taste.

For Healthcare Professionals

Applies to fomepizole: intravenous solution


The most common adverse events were headache, nausea, dizziness, increased drowsiness, and bad taste/metallic taste.[Ref]


Very common (10% or more): Nausea (11%)

Common (1% to 10%): Abdominal pain, vomiting, diarrhea, dyspepsia, heartburn[Ref]

Nervous system

Very common (10% or more): Headache (14%)

Common (1% to 10%): Dizziness, increased drowsiness, bad taste/metallic taste, lightheadedness, seizure, agitation, feeling drunk, vertigo, nystagmus, anxiety, "felt strange", decreased environmental awareness, abnormal smell, roar in ear[Ref]


Common (1% to 10%): Fever, multiorgan system failure, hangover, speech/visual disturbances[Ref]


Common (1% to 10%): Sinus bradycardia/bradycardia, phlebosclerosis, tachycardia, phlebitis, shock, hypotension[Ref]


Common (1% to 10%): Eosinophilia/hypereosinophilia, lymphangitis, disseminated intravascular coagulation, anemia[Ref]


Common (1% to 10%): Transient transaminitis[Ref]


Common (1% to 10%): Pain during injection, inflammation at injection site, application site reaction[Ref]


Common (1% to 10%): Anuria[Ref]


Common (1% to 10%): Hiccups, pharyngitis[Ref]


Common (1% to 10%): Transient blurred vision[Ref]


Common (1% to 10%): Facial flush, rash[Ref]


Common (1% to 10%): Lumbalgia/backache[Ref]


Common (1% to 10%): Decreased appetite


1. "Product Information. Antizol (fomepizole)." Jazz Pharmaceuticals, Palo Alto, CA.

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.