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Antizol Side Effects

Generic Name: fomepizole

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

Not all side effects for Antizol 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 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.

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