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Кефзол

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Кефзол

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Medically reviewed

Marina Burgos

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

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Overview of Кефзол

Property Description
Active Ingredient Cefazolin sodium (Cephazolin sodium)
Form Sterile powder for solution for injection
Pharmacological Class First-Generation Cephalosporin Antibiotic
Common Use Treating and preventing bacterial infections
Origin Semi-synthetic

Кефзол is the trade name for the medication containing the active ingredient Cefazolin sodium, which is precisely classified as a first-generation cephalosporin antibiotic. This substance belongs to the broader category of beta-lactam agents, a family of semi-synthetic drugs used specifically to combat susceptible bacterial infections.

Cefazolin: A First-Generation beta-Lactam Agent

Cefazolin sodium is categorized under the Anatomical Therapeutic Chemical (ATC) code J01DB04. This international classification identifies its role in antimicrobial therapy and its differentiation within the cephalosporin group. The specific molecular structure of this compound is characterized by its efficacy against Gram-positive organisms, a primary feature that distinguishes first-generation cephalosporins from later, broader-spectrum derivatives.

As a semi-synthetic compound, Cefazolin is chemically designed to improve its therapeutic stability against certain bacterial defense mechanisms. This drug profile means it is particularly effective against many common Gram-positive bacteria.

Form and General Purpose

The medication is supplied as a sterile powder for solution for injection, which is reconstituted and administered via the parenteral route. The primary purpose of Cefazolin is to act as a bactericidal agent—an agent that actively kills bacteria—to eliminate susceptible pathogens.

The requirement for parenteral delivery ensures the active compound achieves high concentrations within the body. Cefazolin is utilized for the prevention of infections in surgical settings. Functioning as a cell wall disruptor, Cefazolin causes the structural failure and elimination of the microbe, halting the progression of bacterial disease.

Regulatory References

  1. DailyMed
  2. Cefazolin Sodium Drug Label
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What side effects are possible with Кефзол?

Cefazolin (Кефзол) is associated with a range of possible side effects that affect various body systems. Understanding the safety profile is based on officially documented adverse reaction categories and specific risk factors.

Contraindications and Serious Adverse Reactions

Cefazolin is contraindicated in patients with a history of immediate hypersensitivity reactions, such as anaphylaxis or severe skin reactions, to cefazolin, other cephalosporins, penicillins, or any other beta-lactam antibacterial drugs. A serious and potentially fatal reaction, anaphylaxis, is a recognized risk.

Other serious adverse reactions include seizures, particularly in patients with pre-existing renal impairment where drug accumulation can lead to central nervous system (CNS) toxicity. Clostridioides difficile-associated diarrhea (CDAD), which can range in severity from mild diarrhea to fatal colitis, is a warning associated with nearly all antibacterial agents, including cefazolin.

Common Side Effects

The most commonly reported adverse reactions are generally gastrointestinal and allergic in nature:

  • Gastrointestinal: Nausea, vomiting, and diarrhea.
  • Hypersensitivity/Skin: Rash, urticaria (hives).
  • Local Reactions: Pain, inflammation (phlebitis), or swelling at the injection site.

Population and Safety Considerations

Category Safety Note
Renal Impairment Dose adjustment is required to prevent high drug levels and mitigate the risk of CNS toxicity, including seizures.
Hematologic May cause transient changes in blood cell counts (e.g., leukopenia, neutropenia) or alterations in prothrombin activity, which may require monitoring.
Infection Risk Prolonged use may result in the overgrowth of non-susceptible organisms, leading to super-infections.

All patients with diarrhea following administration must be evaluated for CDAD. Therapy may be associated with elevated liver enzymes.

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Overdose and Emergency Response

Overdose and when to seek help

Overdose with Cefazolin (Кефзол) is formally documented in regulatory sources with specific clinical manifestations and mandated emergency actions.

Documented Manifestations and Severe Outcomes

Inappropriate large doses of parenteral cephalosporins may lead to toxic signs. Documented clinical effects include Central Nervous System (CNS) effects such as dizziness, paresthesias, and headaches. Localized reactions at the injection site, including pain, inflammation, and phlebitis, are also reported. The most severe documented outcome is the potential for seizures and CNS toxicity.

Population Risk and Laboratory Findings

Seizures are particularly likely to occur in patients with renal impairment, as drug accumulation is probable in this population. Laboratory abnormalities that may accompany overdosage include elevations in creatinine, BUN, liver enzymes, and bilirubin, as well as blood cell count changes and a positive Coombs' test.

When to Seek Immediate Medical Help

Urgent medical attention is required immediately upon the presentation of severe manifestations, particularly seizures. Regulatory instructions mandate that if seizures occur, the drug must be discontinued promptly, and supportive treatment must be provided. Anticonvulsant therapy may be administered if clinically indicated. In severe cases involving renal failure, combined hemodialysis and hemoperfusion may be considered as a procedural measure, although supporting data are noted to be unavailable.

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Therapeutic Uses of Кефзол

What Kefzol Treats: Main Uses and Benefits

Kefzol (cefazolin for injection) is a cephalosporin antibiotic applied in addressing a range of bacterial infections. It is relevant for easing discomfort from various symptomatic conditions where supportive symptom management is appropriate. The medicine is commonly used to help manage systemic or localized discomfort caused by susceptible organisms affecting areas like the respiratory tract, urinary tract, skin and skin structure, bones and joints, and is commonly used across conditions presenting with acute episodes like septicemia and endocarditis.

Cefazolin is considered relevant in contexts involving heightened systemic burden, such as its application in surgical prophylaxis. This supportive relief is important when symptoms become temporarily overwhelming.

Cefazolin may assist with maintaining functional stability during recovery and contribute to easing the overall symptom burden. Cefazolin supports the patient during difficult episodes by easing distress.


Quick Fact: Relief for Symptoms related to physical discomfort

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Eligibility and Restrictions for Use

Official Population Eligibility for Cefazolin

Eligibility for Cefazolin (Кефзол) is determined by regulatory agencies based on established safety and risk profiles. The medication is contraindicated for patients with a known severe allergy to Cefazolin itself or to any other antibiotic in the cephalosporin class.


Contraindications and Restrictions

Use is also restricted for patients with a documented history of severe, immediate hypersensitivity reactions to penicillins due to the potential for cross-allergy. In these cases, the use of Cefazolin requires extreme caution.

Population Category Eligibility Status (Regulatory Basis)
Cephalosporin Allergy Contraindicated (Must not use)
Pediatric Patients Approved for those aged 1 month and older
Neonates (< 1 month) Not recommended (Safety not established)
Renal Impairment Conditional use (Dosage adjustment required)
Pregnancy Restricted (Use only if clearly needed)

The FDA and other regulatory authorities advise that Cefazolin use in neonates (infants under one month of age) is not recommended, as safety and effectiveness have not been formally established for this age group. Patients with impaired renal function can use the medicine, but only under conditional use requiring a specific adjustment to the prescribed dose to prevent accumulation and potential toxicity. Use during pregnancy is permitted only if clearly needed.

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What should I know about interactions with other medicines?

Interactions with other medicines and products

The interaction profile for Cefazolin sodium (Кефзол) is documented in regulatory sources based primarily on its elimination pathway, pharmacodynamic risks, and interference with laboratory tests.

Documented Pharmacokinetic and Pharmacodynamic Interactions

Interacting Substance Official Interaction Pattern Official Restriction/Caution
Probenecid Inhibits the renal excretion of Cefazolin, resulting in increased and prolonged plasma concentrations. Co-administration is not recommended.
Anticoagulants Associated with a fall in prothrombin activity (a clotting factor). Monitoring of prothrombin time is required for patients at risk.
Nephrotoxic Agents Concurrent use may increase the risk of renal toxicity. Use with caution; risk is heightened with agents like aminoglycosides.

Interactions Affecting Laboratory Tests

Cefazolin is formally documented to interfere with specific laboratory tests. It may produce a positive direct Coombs test, which can potentially affect blood cross-matching procedures. It can also cause a false-positive reaction for glucose in the urine when non-enzyme-based methods (e.g., Benedict’s solution) are used.

Population-Specific Interaction Notes

For patients with renal impairment, the reduced clearance of Cefazolin can lead to high plasma concentrations that are associated with the risk of seizures and CNS toxicity. Additionally, the substantial sodium content of Cefazolin sodium for injection requires consideration for patients with conditions requiring sodium restriction.

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Mechanism of Action

Cefazolin, the active ingredient, operates via a focused mechanism that results in the destruction of the bacterial cell structure.

Irreversible Targeting of Bacterial Cell Wall Construction

The core mechanism involves the covalent and irreversible inhibition of specific bacterial enzymes known as Penicillin-Binding Proteins (PBPs), which are critical for building the bacterial cell wall. By chemically disabling these enzymes, Cefazolin immediately prevents the final step of peptidoglycan cross-linking, leading to a structural defect in the bacterial cell wall.

Mechanistic Cascade to Bactericidal Clearance

This molecular inhibition initiates a self-destructive mechanistic cascade. The structural failure destabilizes the cell wall, initiating the uncontrolled action of the bacterium’s own autolysin enzymes which accelerate degradation. This combined failure ultimately leads to the bacterial cell being unable to withstand its own internal osmotic pressure, resulting in a definitive rupture and cell death. This outcome is referred to as bactericidal action.

Defining Limitations of the Mechanism

The effectiveness of this bactericidal mechanism is inherently constrained by the presence of bacterial defense mechanisms, primarily beta-lactamase enzymes that chemically deactivate Cefazolin before it can bind to the PBP target. Furthermore, Cefazolin's limited ability to cross the Blood-Brain Barrier results in lower drug concentrations at targets within the central nervous system.

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Dosage and Administration Information

Кефзол (Cefazolin sodium) is administered solely through the parenteral route, typically via intravenous (IV) injection, IV infusion, or intramuscular (IM) injection. It is supplied as a sterile powder that must be reconstituted and diluted with a compatible solution before use. IV infusions are generally administered over a period of approximately 30 minutes.

Dosing and Scheduling

Dosing is determined by the severity of the condition and patient population. Adult doses for moderate-to-severe infections range from 500 mg to 1 gram, administered every 6 to 8 hours. For severe, life-threatening scenarios, doses can range from 1 gram to 1.5 grams every 6 hours.

Perioperative Prophylaxis The standard initial dose for surgical prophylaxis is 1 gram to 2 grams for most adults, administered 1/2 hour to 1 hour prior to the start of surgery. Patients weighing 120 kg may receive an initial dose of 3 grams. Postoperatively, administration is typically discontinued within a 24-hour period after the procedure, though it may be extended to 3 to 5 days for procedures where infection risk is high, such as prosthetic arthroplasty.

Population-Specific Adjustments

Mandatory dosage adjustment is required for patients with reduced renal function (creatinine clearance < 55 mL/min) to prevent excessive drug accumulation. The specific reduction in dose or extension of the dosing interval is based on the degree of renal impairment. Pediatric patients are dosed based on body weight (mg/kg/day) and also require adjustment if their renal function is compromised.

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Recent Clinical Evidence

Research Evidence / Overview of Studies for Cefazolin (Kefzol)


Evidence for Use in Treating Established Infections

Cefazolin was studied for use in adults and children with various confirmed bacterial infections, including those affecting the skin, soft tissues, respiratory system, urinary tract, bones, joints, and the bloodstream. The research design for these indications often included controlled trials and observational cohorts, where researchers monitored outcomes related to the resolution of the infection and the overall clinical status of the patient. Studies report how symptoms evolved in the observed populations. Findings describe patterns observed in these studies related to changes measured during the short-term study period. However, evidence is limited regarding the long-term changes and outcomes following administration for these acute infections, and follow-up durations were limited.


Evidence for Use in Surgical Infection Administration (Perioperative Prophylaxis)

Cefazolin was evaluated in numerous clinical trials exploring its administration around the time of surgery. These studies included patients undergoing various procedures, such as cardiac, orthopedic, and gynecologic surgeries. The main focus of this research was to monitor outcomes related to the incidence of surgical site infections (SSIs) post-procedure. Research describes the incidence of surgical site infections in patients who received Cefazolin. Data show patterns related to measured rates of post-operative infectious complications in many common surgical scenarios. Data for certain groups remain insufficient, and comparative evidence is lacking for certain patient subgroups.


What is Still Uncertain About Cefazolin (Kefzol)

Research exploring the effects of Cefazolin is predominantly focused on the acute study of infections or the short-term administration around the time of surgery. Consequently, long-term effects are not fully established, and there is limited information for long-term outcomes beyond the immediate follow-up period. Furthermore, evidence quality varies across studies, and research in patients with multiple comorbid conditions is still emerging. Finally, research is ongoing to fully understand how administration patterns affect bacterial susceptibility patterns.

Key Studies & References

  1. NICE Guideline NG19: Surgical Site Infections: Prevention and Treatment
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Frequently Asked Questions (FAQ)

Common questions about Кефзол (FAQ)

Q: What specific types of bacteria is Кефзол typically effective against?

According to official product information, Cefazolin is described as effective against certain susceptible bacteria. These typically include Gram-positive organisms, such as various strains of Staphylococcus aureus and Streptococcus pneumoniae.


Q: What should be monitored if a person has kidney problems and is taking Кефзол?

For individuals with reduced kidney function, official prescribing information states that the dosage is required to be adjusted. This adjustment is guided by monitoring kidney function parameters, such as creatinine clearance, and is intended to manage the risk of drug accumulation.


Q: Does Кефзол interact with blood-thinning medications like Warfarin?

Official documents indicate that Cefazolin has been associated with a fall in prothrombin activity, a factor involved in blood clotting. For this reason, official prescribing information advises that patients receiving concurrent anticoagulant therapy, such as Warfarin, require monitoring of their prothrombin time.


Q: Is there a risk of interaction between Кефзол and diuretics (water pills) like Furosemide?

The official prescribing information advises caution when Cefazolin is used alongside certain nephrotoxic agents. Concurrent use is associated with a potentially increased risk of renal toxicity, according to official caution when used with potent diuretics like Furosemide.


Q: Can pregnant women safely receive Кефзол?

Regulatory documents state that Cefazolin is reserved for use during pregnancy only when it is clearly needed. Use is permitted only when the potential benefits are judged to outweigh the potential risks to the fetus.


Q: What is the risk of harm to the infant when using Кефзол during breastfeeding?

Studies and official information indicate that Cefazolin is excreted into human milk in low concentrations. Official prescribing information advises caution when Cefazolin is administered, as its use requires a medical evaluation of potential risks versus benefits to the infant.


Q: Can Кефзол cause issues with blood clotting or increase the risk of bleeding?

Cefazolin use may be associated with temporary changes in blood parameters, including alterations in prothrombin activity, which is an element of the blood clotting process. This change necessitates monitoring for patients who are considered to be at high risk.


Q: How does the excretion of Кефзол primarily happen in the body?

The official pharmacokinetic profile indicates that the majority of Cefazolin is excreted from the body, largely unchanged, through the kidneys. This high degree of renal clearance is consistent with the requirement for dosage adjustments in patients who have reduced kidney function.


Q: What is the main difference between Кефзол and penicillin?

Both Cefazolin (a cephalosporin) and penicillin are part of the beta-lactam class of antibiotics. Cefazolin has a distinct molecular structure and activity profile that sets it apart from penicillin, particularly concerning its stability against certain bacterial defense mechanisms.


Q: Is Кефзол used to treat a viral infection, like a cold or the flu?

Cefazolin is a bactericidal agent, meaning it is designed to kill bacteria. It is indicated specifically for the treatment of infections caused by susceptible bacteria and is not indicated for the treatment of viral infections, such as the common cold or influenza.


Q: Is Кефзол considered a broad-spectrum antibiotic?

Cefazolin is officially classified as a first-generation cephalosporin. These are primarily known for their effectiveness against many Gram-positive organisms, making their scope more defined compared to later generations of cephalosporins, which often possess a broader range of activity.


Q: Can Кефзол cause severe diarrhea, even after treatment is finished?

Severe diarrhea caused by C. difficile (CDAD) is a documented risk associated with nearly all antibacterial agents, including Cefazolin. Official warnings indicate this condition has been reported to occur more than two months after the cessation of antibacterial therapy.


Q: How long does Кефзол stay in your system after the last injection?

Regulatory documents state the drug's half-life, which is the time it takes for the concentration of the medicine in the body to be reduced by half. For Cefazolin in patients with normal kidney function, the half-life is approximately 1.8 hours.


Q: Are there any specific safety concerns for older (geriatric) patients using Кефзол?

Because patients aged 65 and over are more likely to have some decreased renal (kidney) function, official caution applies to dose selection. This monitoring helps prevent excessive drug accumulation in the body, which could lead to adverse effects.


Q: What research evidence supports the use of Кефзол for skin infections?

Clinical evidence for Cefazolin includes controlled studies in patients with various infections, including skin and soft tissue infections. Research describes the outcomes observed in patient populations treated with Cefazolin for these indications.


Q: Does Кефзол cross the blood-brain barrier?

Studies indicate that the penetration of Cefazolin into the cerebrospinal fluid is relatively low in patients who do not have inflamed meninges. This results in lower drug concentrations in the central nervous system.


Q: Is Кефзол a type of sulfa drug?

No. Cefazolin is officially classified as a cephalosporin antibiotic. It belongs to the beta-lactam class of antibiotics and is not a sulfonamide, which is the chemical class known as 'sulfa drugs.'


Q: Why do doctors prescribe Кефзол for some types of strep infections?

Cefazolin is indicated for treating infections caused by susceptible organisms, which regulatory documents identify as including Streptococcus pyogenes and Streptococcus pneumoniae. Its use is based on documented effectiveness against these specific pathogens.


Q: Can someone who has taken Кефзол before still get an allergic reaction later on?

Hypersensitivity reactions, including severe and potentially fatal anaphylaxis, are possible with Cefazolin. A severe reaction may occur even in patients with no known history of allergy to the drug.


Q: What is the general difference in the type of bacteria treated by first-generation cephalosporins versus later generations?

Cefazolin (a first-generation cephalosporin) is highly active against many Gram-positive bacteria. Later-generation cephalosporins are noted in pharmacology to have a generally broader spectrum of activity, often with increased effect against Gram-negative organisms.


Q: What are the potential signs of a superinfection (like oral thrush) while on Кефзол?

Official warnings state that prolonged use of Cefazolin may result in the overgrowth of non-susceptible organisms. This is referred to as a superinfection, and one presentation of this is mucocutaneous candidiasis (fungal overgrowth), commonly known as oral thrush.


Q: Why is Кефзол generally administered in a hospital or clinic setting?

Cefazolin is supplied as a sterile powder for solution for injection, which is administered via the intravenous (IV) or intramuscular (IM) route. These routes require the professional setup, preparation, and supervision found in a clinical setting.


Q: Is it normal to feel a bit nauseous or have a mild headache during treatment with Кефзол?

Regulatory documents list nausea as a commonly reported adverse reaction. While headache is not typically listed among the most common adverse reactions, it is a non-specific event that has been reported.


Q: Can Кефзол be used to treat infections caused by protozoa?

Cefazolin is classified as an antibacterial agent. Its mechanism is focused on disrupting the bacterial cell wall and is indicated only for infections caused by susceptible bacteria, not for infections caused by non-bacterial pathogens like protozoa.


Q: Can the administration of Кефзол be combined with other IV fluids?

The Cefazolin solution must be diluted with a compatible IV fluid (such as 0.9% Sodium Chloride or 5% Dextrose Injection) before it is infused. Compatibility with other medicines or solutions is confirmed prior to mixing.

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How should Кефзол be stored and disposed of?

Official Storage and Handling Requirements

The storage requirements for Cefazolin sodium are determined by its formulation. The dry powder for injection must be stored at Controlled Room Temperature (20 C to 25 C) and must be protected from light.

Formulation State Required Storage Temperature Stability Time Limit
Reconstituted Solution Room Temperature (up to 25 C) 4 hours
Reconstituted Solution Refrigerated (2 C to 8 C) 3 days
Thawed Premixed Solution Refrigerated (5 C) 30 days

Prohibited Handling: The thawed solution must not be refrozen, and thawing must not occur using water baths or microwave irradiation. Solutions that show any discoloration, cloudiness, or precipitate must be discarded.

Disposal: Unused portions of the reconstituted solution must be discarded. The medication must be kept out of the reach of children and pets and must not be flushed down the toilet.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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