Skip to Content

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.

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.

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.

Disclaimer: Every effort has been made to ensure that the information provided is accurate, up-to-date and complete, but no guarantee is made to that effect. In addition, the drug information contained herein may be time sensitive and should not be utilized as a reference resource beyond the date hereof. This material does not endorse drugs, diagnose patients, or recommend therapy. This information is a reference resource designed as supplement to, and not a substitute for, the expertise, skill , knowledge, and judgement of healthcare practitioners in patient care. The absence of a warning for a given drug or combination thereof in no way should be construed to indicate safety, effectiveness, or appropriateness for any given patient. does not assume any responsibility for any aspect of healthcare administered with the aid of materials provided. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the substances you are taking, check with your doctor, nurse, or pharmacist.