Céfazoline
antibiotic · cephalosporin
Third-party optionBy the Layer Nutrition editorial team · How the atlas classifies the 664 molecules
What this medicine is for
Pharmacologically, Cefazolin relates to the category “antibiotic (cephalosporin)”. Antibiotics treat infections caused by bacteria. They are taken as a course, over a set duration, until the end of the prescription.
Specifically, for Cefazolin: Treats a bacterial infection. Its use is generally limited in time, adjusted to the situation.
Under which brands it is found
In France, about 4 reimbursable presentations containing Cefazolin are recorded. It is found under several brand names and as generics.
- Cefazoline Basi
- Cefazoline Panpharma
- Cefazoline Qilu
- Cefazoline Viatris
Generics and the original brand are equivalent for the active substance; only the appearance, the name or the excipients may differ.
On the plate: vitamin K
Antibiotic treatment disrupts the gut flora that produces part of our vitamin K. Food remains the simplest way to maintain your intake of vitamin K.
Vitamin K is concentrated in leafy green vegetables: kale, spinach, chard and turnip greens are its richest sources. Broccoli, Brussels sprouts and cauliflower also provide generous amounts.
Other foods round out the intake, in smaller proportion: fish, meat, eggs and cereals. Regularly bringing these green vegetables back into your meals supports your intake, alongside your treatment.
How cefazolin works
Cefazolin belongs to the first-generation cephalosporins, a family within the beta-lactam antibiotics. At the heart of the molecule, the beta-lactam ring binds to bacterial enzymes called penicillin-binding proteins, or PBPs. By binding to these PBPs, cefazolin blocks the transpeptidation reaction, the step that links together the chains of peptidoglycan. Without this cross-linking, the bacterial wall can no longer be built or repaired.
Deprived of its wall, the bacterium can no longer withstand its own internal pressure and dies: the effect is bactericidal. This bactericidal action of the cephalosporins follows directly from the inhibition of cell wall synthesis. Cefazolin thus targets a structure specific to bacteria, absent from our own cells, which explains why it strikes them without affecting the host in the same way.
Why cefazolin is prescribed
Cefazolin acts on Gram-positive cocci, particularly methicillin-sensitive Staphylococcus aureus and streptococci, as well as on some Gram-negative bacteria such as Escherichia coli, Klebsiella and Haemophilus influenzae. Methicillin-resistant staphylococci and many Enterobacter strains, on the other hand, are resistant to it. This spectrum of activity directly guides its indications.
It is prescribed for respiratory, urinary, skin, biliary, bone and joint infections. It is also used as antibiotic prophylaxis before contaminated surgery, where it remains the cephalosporin of choice. The use of cefazolin depends on the suspected organism, the site of the infection and its presumed susceptibility.
How the treatment unfolds
Cefazolin is given by injection, intravenous or intramuscular, and never by mouth. The question of taking it with or between meals therefore does not arise, since it is the care team who performs the injections. The usual dosage ranges from 500 mg to 1 g every 6 to 8 hours for moderate to severe infections.
Its serum half-life is around 1.8 hours after intravenous injection, which justifies these repeated doses through the day to maintain an effective concentration. Keeping to the schedule and completing the full prescribed duration matters as much as the dose, even when symptoms improve before the end. Stopping treatment too soon risks a relapse and encourages the emergence of resistance.
The effects to know about
Digestive disturbances are among the most frequent effects: diarrhea, and more rarely a pseudomembranous colitis linked to the bacterium Clostridioides difficile, an effect known across all the cephalosporins. Allergic reactions can also occur, from simple hives to serious forms such as anaphylaxis or Stevens-Johnson syndrome. These hypersensitivity reactions remain uncommon, somewhat more reported with the first- and second-generation cephalosporins.
On the laboratory side, blood abnormalities may be seen, such as neutropenia or thrombocytopenia, along with a transient rise in urea, creatinine and transaminases. These variations generally return to normal after treatment is stopped. A skin rash, swelling or diarrhea that persists warrants telling the care team without delay.
Vitamin K, gut flora and coagulation
Part of our vitamin K is produced by the bacteria that populate the lower part of the intestine. Prolonged antibiotic treatment disrupts this flora and can, in some cases, reduce this supply and lead to a vitamin K deficiency. This vitamin is essential for blood coagulation.
In addition, the cephalosporins can be associated with a decrease in prothrombin activity, especially in people already at risk of vitamin K deficiency. This is why prothrombin time and INR are monitored when the situation requires it, with vitamin K supplied if needed. Food remains a simple support for vitamin K intake.
Interactions, sodium and monitoring
Cefazolin is eliminated mainly by the kidney: about 60 % of the drug passes into the urine within the first six hours, then 70 to 80 % within twenty-four hours. In case of kidney failure, the dosage is reduced to avoid accumulation. Each gram of cefazolin sodium also provides 48 mg of sodium, that is 2 mEq, a load to consider in people who must limit salt, in cases of heart failure, hypertension or kidney failure.
Monitoring covers allergic signs, such as hives, itching, swelling or anaphylaxis, and kidney function, all the more so since the kidney handles most of the elimination. Depending on the situation, prothrombin time and INR are also checked. Any unusual reaction should be reported to the care team.
Sources
Related molecules
To explore in the « Anti-infectives » family and its neighbours.
See the whole « Anti-infectives » family · Back to the atlas
Supplements to consider
Beyond the plate, a single isolated nutrient can be worth discussing, to confirm with your doctor or pharmacist. Here is which one and in which form.
Probiotics
Probiotics are live micro-organisms, mainly lactobacilli and bifidobacteria. The CFU count and the number of strains are among the selection criteria; gastro-resistant capsules protect the bacteria from stomach acidity.
Preferred form gastro-resistant capsules, several strains, CFU count stated
Frequently asked questions
What is cefazolin used for?
Cefazolin is an antibiotic in the first-generation cephalosporin family, given by injection, either intravenously or intramuscularly. It is used in particular as prophylaxis during surgery and to treat certain bacterial infections. It is administered by a healthcare professional, most often in a hospital setting. For your own situation, refer to the package leaflet and to your doctor or pharmacist.
What are the side effects of cefazolin?
The package leaflet notes in particular allergic reactions, digestive problems such as nausea or diarrhea, and reactions at the injection site. Not everyone experiences every effect, and how often they occur varies. Report any unusual effect to your doctor or pharmacist and refer to the product's package leaflet.
Can you receive cefazolin if you are allergic to penicillin?
Cross-allergy between penicillins and cephalosporins is possible, which makes this an important thing to disclose. Report any known allergy, especially to antibiotics, before it is administered. The decision rests with the doctor, who adapts it to your medical history. The package leaflet sets out these contraindications.
Cefazolin and pregnancy or breastfeeding: what precautions apply?
The package leaflet details the precautions to take during pregnancy or breastfeeding, with use assessed case by case by the doctor. Always report a pregnancy, plans to become pregnant, or breastfeeding before it is administered. Do not stop or change anything on your own; discuss it with your doctor or pharmacist.
What drug interactions does cefazolin have?
Certain combinations require monitoring, for example with aminoglycosides or anticoagulants. Give your doctor or pharmacist the full list of your treatments, including those taken without a prescription. Refer to the package leaflet, which lists the known interactions.
Should you consider probiotics for gut flora with an antibiotic like cefazolin?
Like other antibiotics, cefazolin affects the gut flora, which can be accompanied by digestive discomfort. Studies link taking probiotics with better digestive comfort during and after a course of antibiotics. The active to consider is a blend of ferments such as Lactobacillus strains or the yeast Saccharomyces boulardii, in a gastro-resistant capsule form that protects the ferments all the way to the intestine. Medical advice is still helpful for choosing when to take it.
Ces réponses portent sur le volet nutritionnel. Pour toute question sur votre médicament, la notice et votre médecin ou pharmacien font foi.