A hospital antibiotic drip for resistant Gram-negative infections
Cefiderocol
A specialist hospital antibiotic given by drip into a vein for serious infections caused by resistant Gram-negative bacteria.
What is Cefiderocol?
Cefiderocol is a specialist antibiotic from the cephalosporin family, used in hospital for serious infections caused by Gram-negative bacteria that are resistant to many other antibiotics. It is given by drip into a vein. It is clever in the way it gets into bacteria: it hitches a ride on the iron the bacteria need, which is why it is sometimes called a siderophore antibiotic. Because it is a cephalosporin, people with a serious allergy to penicillins or cephalosporins need to be assessed carefully. It is reserved for difficult infections and used under specialist guidance to help keep it working.
Education and reference only. This is a plain-language guide to Cefiderocol — it deliberately contains no doses. Doses depend on the person, the brand and the reason for treatment, and belong with your prescriber. Always check the BNF, the product labelling (SmPC) and follow medical advice.
What it is
Cefiderocol is a specialist antibiotic belonging to the cephalosporin family. It is used in hospital to treat serious infections caused by Gram-negative bacteria, a group of bacteria that can be especially hard to treat when they have become resistant to many usual antibiotics. It is given as a drip into a vein. It is reserved for difficult or resistant infections, often where other options have failed or are unsuitable, and is prescribed under specialist and microbiology guidance to make sure it is used appropriately and stays effective.
How it works
Like other cephalosporins, cefiderocol kills bacteria by stopping them building their protective cell wall, which the bacteria need to survive. What makes it special is how it gets inside resistant Gram-negative bacteria: it binds to iron and is then carried in through the doorways the bacteria normally use to take up iron, a trick that lets it bypass some of the defences other antibiotics get blocked by. Reaching the inside of the bacterium in this way is why it can work against bugs that resist many other treatments. It is given as a drip so it reaches the infection reliably.
Company & origin
Originated / developed by: Specialist manufacturer.
A specialist hospital antibiotic used in the UK, given by drip into a vein, for serious infections caused by resistant Gram-negative bacteria.
Practical use
How to take Cefiderocol
General, dose-free guidance — always follow your prescriber's and the leaflet's specific instructions.
- Have it given as a drip into a vein by the hospital team, over the time they specify.
- Tell the team about any allergy to penicillins or cephalosporins before it is started.
- Complete the full course your team prescribes, even if you start to feel better.
- Report any rash, swelling, breathing difficulty or new severe diarrhoea promptly.
- Let the team manage timing and dosing, as it is a reserve antibiotic used under specialist guidance.
Weighing it up
Advantages & disadvantages of Cefiderocol
Advantages
- Works against serious Gram-negative infections that resist many other antibiotics.
- Uses a clever iron-transport route to get inside otherwise hard-to-treat bacteria.
- Provides a treatment option when other antibiotics have failed or cannot be used.
Disadvantages
- Given only in hospital as a drip into a vein.
- Needs careful allergy assessment because of cross-reactivity with penicillins and cephalosporins.
- Reserved for resistant infections, and must be used carefully to avoid encouraging further resistance.
Practical use
Good to know
The key thing to understand is that cefiderocol is a reserve antibiotic for serious, resistant Gram-negative infections, used in hospital and given by drip into a vein. Because it is a cephalosporin, allergy matters: people who have had a serious allergic reaction to cephalosporins, or a severe reaction to penicillins, need careful assessment before it is used, as there can be cross-reactivity between these antibiotic families. As with all antibiotics, it should be used only when truly needed and for the right length of time, because overusing reserve antibiotics encourages resistance, which is why it is guided by microbiology specialists. It is generally well tolerated, with effects similar to other cephalosporins, and the hospital team monitors the response and watches for any reactions.
Who should not take it / use with caution
- People who have had a serious allergic reaction to cefiderocol or other cephalosporins should not have it.
- It is used with great caution, after careful assessment, in people with a severe penicillin allergy because of possible cross-reactivity.
- It is used under specialist and microbiology guidance, reserved for resistant infections.
Monitoring
- Watching how the infection responds to treatment.
- Checking for allergic-type reactions and any reaction at the drip site.
- Watching for severe or persistent diarrhoea, which can signal a gut infection.
Side effects
- Diarrhoea, nausea or vomiting.
- A rash or reaction where the drip is given.
- Less commonly, allergic-type reactions or, rarely, severe diarrhoea linked to a gut infection (Clostridioides difficile), which needs urgent attention.
Key interactions
- Tell the team about all your medicines, although it has relatively few direct interactions.
- Allergy to other penicillins or cephalosporins is the most important thing to check before use.
- As with other antibiotics, it can affect the balance of gut bacteria, which sometimes leads to diarrhoea.
Available as: A powder made up into a solution given as a drip into a vein.
Answers
Cefiderocol: frequently asked questions
What is cefiderocol used for?
It is a specialist hospital antibiotic used for serious infections caused by Gram-negative bacteria that are resistant to many other antibiotics, given as a drip into a vein.
How does it get into resistant bacteria?
It binds to iron and is carried into the bacterium through the doorways the bacteria use to take up iron, which lets it bypass some defences other antibiotics are blocked by.
I am allergic to penicillin — can I have it?
Because cefiderocol is a cephalosporin, a serious penicillin allergy needs careful assessment first, as there can be cross-reactivity between these antibiotic families.
Why is it only used in hospital?
It is a reserve antibiotic for serious, resistant infections and is given as a drip into a vein, so it is used in hospital under specialist guidance.
Why does it need to be used carefully?
Overusing reserve antibiotics encourages resistance, so cefiderocol is guided by microbiology specialists and used only when truly needed and for the right length of time.
The wider class
About Cephalosporin antibiotic (siderophore)
Cefiderocol belongs to the cephalosporin antibiotic (siderophore) class. For how the class as a whole works, its shared safety principles and monitoring, see the full guide.
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Authoritative sources
- BNF
- NICE CKS
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