What is fomepizole injection used for?
Fomepizole injection is used to treat poisoning from alcohols and glycols that are metabolized into toxic compounds. It works by inhibiting the enzymes that convert these substances into their toxic metabolites, giving the body time to clear the poison and reducing risk of severe metabolic complications.
How does fomepizole work?
Fomepizole blocks alcohol dehydrogenase (the key enzyme involved in forming toxic metabolites from certain alcohols/glycols). By slowing formation of toxic breakdown products, it helps prevent or limit metabolic acidosis and other organ damage associated with these poisonings.
Which poisonings is it typically for?
Clinically, fomepizole is commonly associated with treatment of poisonings such as:
- Ethylene glycol
- Methanol
- Sometimes other related toxic alcohols/glycols depending on local protocols and availability of confirmatory testing
How is fomepizole given and what dosing schedule is used?
Fomepizole injection is administered intravenously. The exact dosing regimen can depend on the suspected substance, patient factors, and measured lab findings (for example, whether toxic metabolites are being generated rapidly). Clinicians generally follow established dosing protocols for the suspected ingestion.
How fast does it start working, and what happens after treatment begins?
After administration, clinicians typically monitor:
- Metabolic status (especially acid-base and anion gap trends)
- Toxic metabolite levels when available
- Kidney function and other organ effects
Supportive care (like IV fluids, management of complications, and seizure control if needed) may accompany fomepizole. Some patients may also require extracorporeal removal (dialysis) based on severity and lab results.
When is dialysis used instead of or in addition to fomepizole?
Dialysis may be used when poisoning is severe or when there is concern about ongoing production of toxic metabolites or impaired clearance. In many treatment pathways, fomepizole and dialysis are used together or sequentially depending on clinical severity, lab values, and local guidelines.
What side effects do patients ask about?
Side effects vary by patient and dose, but common concerns with IV fomepizole can include:
- Nausea, headache, dizziness
- Injection-site reactions
Serious reactions are less common but may occur; clinicians monitor for intolerance and for changes in lab values during treatment.
Is fomepizole injection the same as Antizol?
Fomepizole is the generic drug name; “Antizol” is a brand name used for fomepizole in some markets. The active ingredient is the same.
Where can I find the exact prescribing information (dose, warnings, and contraindications)?
The most reliable source for exact dosing, administration details, and warnings is the full FDA-approved or local prescribing information for the specific product (brand/generic) available where you live. If you share your country (or the exact product label name), I can help you locate the correct prescribing details.