USES
Healthcare providers give cefazolin as an intravenous or intramuscular injection. Some general guidelines for the administration of cefazolin follow:
Intravenous Administration: Cefazolin is usually diluted in an appropriate fluid and given over a period of 30 minutes or more. It may be infused with a drip or infusion pump.
Intramuscular (IM) injection: Cefazolin can be injected into large muscles, which are usually located in the thigh or buttocks. The injection should be done carefully to avoid tissue damage.
Patients on cefazolin must be treated until a full course is complete because they might feel well at the end of this but before finishing the medication. Cessation of the drugs at an inappropriate time is one of the major sources of incomplete eradication and, as a result, selection of resistant organisms.
WORKING
It inhibits the synthesis of the bacterial cell wall. Bacteria rely on their cell walls for structural integrity, and when the cell wall cannot be properly formed, the bacteria become weak and eventually rupture. Cefazolin binds to specific proteins known as penicillin-binding proteins in the bacterial cell wall, thereby inhibiting the functioning of PBPs and preventing the cell from constructing a strong wall.
This renders cefazolin effective against gram-positive organisms, including Staphylococcus aureus and Streptococcus pneumoniae, and certain gram-negative organisms, including Escherichia coli and Proteus mirabilis. However, it is not effective against all the types of bacteria, and overuse or misuse can develop resistance.
SIDE EFFECTS
General adverse effects of cefazolin are:
Hypersensitivities: They vary from a simple macular rash with pruritus to full anaphylaxis that comes as swelling of the face and difficulty breathing.
Hypersensitivity is not present alone; nausea, vomiting, and diarrhea occur more commonly.
Injection site reactions: Pain, swelling, and redness at the site of injection (whether intravenous or intramuscular) can occur.
Elevated liver enzymes: In rare cases, cefazolin may cause liver function abnormalities, which can be monitored through blood tests.
Nephrotoxicity: Though rare, cefazolin can cause kidney damage, especially when used in combination with other nephrotoxic drugs.
Serious adverse effects, including life-threatening allergic reactions (anaphylaxis), require immediate treatment, and medical professionals should be notified.
WARNINGS
Penicillin or cephalosporins allergy: You are likely to have reactions to cefazolin, if you are allergic to penicillins or other cephalosporin antibiotics. Tell your healthcare professional of such known allergies before initiating the administration of cefazolin.
Kidney disease: Because the renal excretion of cefazolin is so prominent, this agent must be used cautiously in patients with impaired renal function. Dose modifications are sometimes necessary for patients with reduced renal function.
Pregnancy and breastfeeding: Cefazolin is a pregnancy category B drug, which means it is considered safe for use during pregnancy but should only be used if absolutely necessary. It is also excreted in breast milk; thus, caution is taken when using the drug during breastfeeding.
Superinfection: Prolonged use of cefazolin leads to superinfections or growth of non-susceptible organisms. Additional treatment may be necessary.
INTERACTIONS
Cefazolin interacts with a variety of drugs. The most significant interactions involve the following drugs:
Probenecid: The drug, which is given for gout, reduces cefazolin elimination by the body and increases blood levels, possibly causing toxic levels.
Aminoglycosides, such as gentamicin: Administration of cefazolin in combination with aminoglycosides elevates the possibility of nephrotoxicity or damage to the kidneys.
Oral anticoagulants (such as warfarin): The administration of cefazolin enhances the anticoagulant effect of warfarin, which raises the potential for bleeding.
Diuretics (such as furosemide): Administration with cefazolin may augment the risk of renal complications
Notify your prescriber of any other prescription and nonprescription medications you are taking, including vitamins and dietary supplements, to reduce the possibility of drug interactions.
DOSAGE
The dosage of cefazolin is based on the infection being treated, the severity of the infection, and the patient’s renal function. Typical adult dosages include the following:
- For moderate to severe infections: 1–2 g every 8 hours, depending on the infection.
- For surgical prophylaxis: A single dose of 1–2 g 30 minutes to 1 hour before surgery.
- For urinary tract infections or skin infections: 500 mg to 1 g every 8 hours.
- For patients with renal failure: Dosage must be titrated.
Duration of treatment is usually given based on the type of infection and its severity, so it may last from just a few days to as long as weeks in severer cases.
PRESCRIPTION
Cefazolin is a prescription medicine that should be administered in a clinical or hospital setup. A healthcare provider needs to evaluate the patient’s past medical history, current state, and potential drug interaction before prescribing cefazolin. Cefazolin should only be used after confirmation or strong suspicion of a bacterial infection to avoid overuse and resistance.
FAQ's
1. What is Cefazolin injection?
Cefazolin is a first-generation cephalosporin antibiotic administered by injection.
2. What infections is Cefazolin injection used to treat?
It treats serious bacterial infections including skin, bone, respiratory, urinary tract, and bloodstream infections.
3. How does Cefazolin work?
It kills bacteria by disrupting their cell wall, causing bacterial death.
4. How is Cefazolin injection administered?
By intramuscular (IM) or intravenous (IV) injection.
5. What is the usual dosage of Cefazolin injection?
Dosage varies by infection type and severity; generally 1 to 2 grams every 8 hours.
6. Can Cefazolin injection be used for surgical prophylaxis?
Yes, it is commonly given before surgery to prevent infections.
7. Are there any common side effects of Cefazolin injection?
Pain or irritation at injection site, rash, nausea, and diarrhea.
8. Can Cefazolin cause allergic reactions?
Yes, especially in patients allergic to penicillins or other cephalosporins.
9. Is Cefazolin safe for pregnant women?
Generally considered safe, but only use if clearly needed and prescribed by a doctor.
10. How long does treatment with Cefazolin injection usually last?
Treatment duration depends on infection severity; typically 7-14 days or as directed.
11. Does Cefazolin injection require refrigeration?
Yes, reconstituted solutions may require refrigeration; store powder at room temperature before use.
12. Can Cefazolin injection be given to children?
Yes, with dosage adjustments based on weight and age.
13. What should be done if a dose is missed?
Inform your healthcare provider; do not double the next dose without advice.
14. Can Cefazolin injection affect kidney function?
It can affect kidneys; monitoring is needed in patients with kidney issues.
15. Are there any drug interactions with Cefazolin injection?
Yes, especially with nephrotoxic drugs and blood thinners; inform your doctor.
16. How quickly does Cefazolin injection work?
It starts working promptly after administration, typically within hours.
17. Can Cefazolin injection be used for MRSA infections?
No, Cefazolin is not effective against Methicillin-resistant Staphylococcus aureus (MRSA).
18. What precautions should be taken during Cefazolin therapy?
Monitor for allergic reactions and kidney function; report any unusual symptoms.
19. Can patients be allergic to Cefazolin if they are allergic to penicillin?
Yes, cross-reactivity can occur but the risk is low.
20. What storage conditions are needed for Cefazolin injection?
Store powder at room temperature; protect reconstituted solutions per instructions.