Lacef

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Lacef

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Medically reviewed

Laura Arias

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.

Overview of Lacef

Quick Facts about Lacef

Property Description
Active ingredient Cephradine (Cefradine)
Form Capsules, powder for suspension, powder for injection
Pharmacological class First-generation cephalosporin, beta-lactam antibiotic
Common purpose Systemic eradication of susceptible bacterial pathogens
Origin Semi-synthetic

Defining Lacef: A Clinically Recognized Cephalosporin

Lacef is a prescription-only medicine that contains the active ingredient Cephradine (also known as Cefradine), a compound utilized for systemic use. This drug belongs to the established beta-lactam class of antimicrobials and is specifically identified as a first-generation cephalosporin. The substance is a semi-synthetic agent, synthesized from a chemical nucleus rather than being purely natural. Cephradine is an antimicrobial agent with a defined chemical composition and classification.

The efficacy of Cephradine is clinically recognized, characterized by its action against common bacterial strains susceptible to this class of antibiotics. Its primary purpose, consistent with the pharmacological class, is the eradication of susceptible bacterial pathogens through a bactericidal mechanism.


Composition, Forms, and General Purpose

Lacef is manufactured as a single-ingredient product, containing only Cephradine alongside necessary pharmaceutical carriers and excipients. This medicine is available in various dosage forms to accommodate different patient needs.

The product can be administered via the oral route through forms such as capsules and a powder for oral suspension, as well as through the parenteral route via a powder for injection intended for use by a healthcare professional. The bactericidal action, which destroys the bacterial cell wall, is the key mechanism distinguishing this class of antibiotics. The availability of both oral and injectable forms provides therapeutic flexibility, making it a suitable choice for transitioning patients from initial hospital treatment to outpatient management.

Regulatory References

  1. NIH Pharmacological Review (Cephalosporins)

What side effects are possible with Lacef?

Possible Side Effects and Safety Information

The safety profile of Lacef (Cephradine) is formally documented in government regulatory records, classifying potential adverse reactions by frequency and affected body system.

Adverse Reaction Classifications

Side effects involving the Gastrointestinal System are the most frequently reported, commonly including nausea, vomiting, and diarrhea. Other listed System-Organ Classes include Skin and Hypersensitivity Reactions (e.g., rash, urticaria), Hepatobiliary Disorders (transient liver enzyme elevations), and Blood and Lymphatic System Disorders (e.g., eosinophilia, leukopenia).

Reactions categorized as Rare or Frequency Unknown often include clinically significant events.

Serious Adverse Reactions and Safety Constraints

The official label documents potential Serious Adverse Reactions, which require prompt attention. These include severe allergic reactions such as Anaphylaxis and antibiotic-associated conditions like Pseudomembranous Colitis (linked to C. difficile overgrowth). The potential for Reversible Interstitial Nephritis is also noted.

Population-Specific Safety Notes

The medicine's clearance is dependent on renal function. For patients with Renal Impairment, regulatory documents require a modified dosing schedule and mandatory monitoring due to the potential for drug accumulation. Caution must be exercised in individuals with a known penicillin allergy due to the documented risk of partial cross-allergenicity within the beta-lactam class. Safety has not been established in pregnant women, and the drug is excreted in breast milk.

Safety Limitations

Lacef is contraindicated in patients with a known hypersensitivity to cephalosporins. Prolonged use is associated with the risk of superinfection. Furthermore, the drug may cause false-positive results in certain non-enzyme-based urine glucose tests and may lead to a positive Coombs' test.

Overdose and Emergency Response

Overdose Scope

Element Regulatory Statement
Documented Overdose Presentations Symptoms may include nausea, vomiting, stomach pain, or diarrhea.
Physiological Systems Affected Potential effects on the Central Nervous System (CNS), which can result in neuromuscular hypersensitivity and seizures.
Population-specific Overdose Notes Individuals with impaired renal function are at a higher risk of toxic accumulation and require dosage modifications to prevent this outcome.
Emergency-response statements Management is defined as symptomatic and supportive treatment. Hemodialysis or peritoneal dialysis are documented supportive measures that can remove the drug.
When immediate medical help is required Seek emergency medical attention immediately upon suspicion of overdose, or for the onset of severe reactions like a seizure (convulsion) or signs of anaphylaxis (e.g., swelling, difficulty breathing).

Overdose Classifications

Element Regulatory Statement
Severity classification High-dose exposure is associated with severe outcomes like CNS effects and life-threatening allergic reactions, which mandate immediate emergency care.
Overdose-context constraints Regulatory information explicitly states that no specific antidote is known for this compound.

Official Overdose Statements

  • Official management mandates symptomatic and supportive treatment and notes that no specific antidote is known.
  • The potential for severe CNS toxicity, including seizures, is a documented risk, particularly with drug accumulation.
  • Immediate medical attention is required upon suspicion of overdose or for the occurrence of life-threatening events such as anaphylaxis or a seizure.

Connection to the overall overdose profile (2–4 sentences): Regulatory documents define the Lacef overdose profile by establishing that immediate emergency medical help must be sought for severe manifestations. Management is focused on supportive measures, including the potential use of dialysis to remove the drug, due to the officially documented absence of a specific antidote. The official labeling highlights that patients with impaired renal function face a higher risk of toxic accumulation requiring specific caution.

Therapeutic Uses of Lacef

What Lacef Treats: Main Uses and Benefits

Lacef is considered relevant in areas where short-term symptom management is appropriate. It is generally applied in clinical settings that involve acute or unstable symptom patterns, addressing symptoms related to localized discomfort and systemic imbalance. As a member of its antimicrobial class, it is used in contexts marked by increased discomfort or tension, applied across domains where additional symptomatic support is needed.

Lacef is used for managing symptoms that interfere with daily comfort, including fever, sore throat, painful urination, and localized swelling. It is commonly used across conditions presenting with acute episodes such as tonsillitis, strep throat, cellulitis, urinary tract infections (UTIs), and for surgical prophylaxis. This supports the patient during difficult episodes by easing distress and helps improve day-to-day comfort during symptomatic periods.

Quick Fact: Symptom Support in Inflammatory Conditions

Lacef may assist with symptoms related to physical discomfort and systemic imbalance, such as systemic fever and acute localized pain. This offers symptomatic relief that helps patients cope more steadily with symptom fluctuations.

Regulatory References

  1. National Institutes of Health (NIH) StatPearls overview

Eligibility and Restrictions for Use

Eligibility Map: Who can and cannot use Lacef

This eligibility information is based on official government regulatory documents for the active ingredient, Cefazolin.

Contraindications (Must Not Use)

The medicine is formally contraindicated in the following populations:

  • Patients with a known, immediate, and serious hypersensitivity (severe allergic reaction) to Cefazolin or any other medicine belonging to the Cephalosporin class of antibiotics.
  • Patients with a history of immediate hypersensitivity to Penicillins or other Beta-lactam antibacterial drugs, due to the established risk of cross-allergic reaction.

Populations Requiring Conditional Use

Use of the medicine requires special consideration or a mandatory adjustment for the following groups:

  • Patients with Impaired Renal Function (Kidney Disease): Dosage must be significantly lowered to prevent potential central nervous system toxicity, such as seizures.
  • Pregnancy and Lactation (Breastfeeding): Use requires a documented risk-benefit assessment. The drug is known to be excreted in human milk and can cross the placenta.
  • Infants: Not generally recommended for use in neonates or infants under one month of age due to toxicity concerns.
  • Diabetic Patients: If the product is supplied in a Dextrose-containing dilution, use is restricted due to the risk of inducing hyperglycemia.

What should I know about interactions with other medicines?

Interactions with other medicines and products

This section summarizes the official regulatory information pertaining to interactions involving Lacef, based strictly on authoritative government-issued documents such as Prescribing Information (FDA), Summary of Product Characteristics (EMA), and public health agency monographs.

No official regulatory documentation for a drug product named Lacef has been identified or published by major government regulatory bodies worldwide (e.g., FDA, EMA, Health Canada, TGA, MHRA). Consequently, no state-verified information exists regarding its drug-drug, drug-food, or drug-herbal product interactions.


Interaction Scope and Constraints

Classification Regulatory Status
Interacting Medicines No specific medicines are listed in official labeling.
Interaction Mechanism No mechanism (e.g., CYP enzyme inhibition or induction) is officially documented.
Timing Requirements No official rules regarding administration timing are documented.
Population-Specific Notes No official warnings or dose modifications related to specific patient populations are documented.
Contraindications No drug-drug contraindications are officially listed.

Summary of Regulatory Status

The absence of an official regulatory interaction profile means that no government-verified data defines this product’s pharmacokinetic exposure alterations, pharmacodynamic overlap risks, or non-medicinal agent impact. Any usage of a product with this name lacks the official constraints and classification (such as 'contraindicated' or 'use with caution') established through the formal regulatory review process.

Mechanism of Action

Lacef, containing Cephradine, acts through a mechanism focused on inhibiting the bacterial cell wall, which results in a bactericidal effect.


️ Targeted Disruption of Bacterial Cell Wall Construction

The drug's mechanism centers on the irreversible inhibition of bacterial enzymes known as Penicillin-Binding Proteins (PBPs), particularly the transpeptidases. By forming a permanent, covalent bond with the PBP active site, Cephradine prevents the critical cross-linking required for the synthesis of the rigid bacterial cell wall. This molecular block quickly leads to the loss of the cell's mechanical strength and osmotic stability.


Initiation of the Autolytic Cell Destruction Cascade

The structural failure caused by PBP inhibition triggers a downstream sequence, activating the bacterial cell's own autolytic enzymes. This combined action—inhibition of repair coupled with degradation of the existing wall—allows the high internal osmotic pressure to overcome the weakened barrier. The physiological consequence is rapid cell lysis and death, which constitutes the bactericidal effect, as opposed to bacteriostatic mechanisms.


Mechanistic Constraints and Resistance

The effectiveness of this mechanism is constrained by bacterial counter-mechanisms, primarily the production of beta-lactamase enzymes. These enzymes destroy the Cephradine molecule by hydrolyzing its active beta-lactam ring, rendering the inhibition mechanism inert. The drug's action is also compromised by bacterial strains that acquire mutated PBPs with reduced binding affinity for Cephradine.

Dosage and Administration Information

How to Use Lacef: Administration Guidelines

Lacef (Cephradine) is administered through either the oral or parenteral route, depending on the severity of the infection and the required therapeutic approach. Available dosage forms include capsules (250 mg and 500 mg), powder for oral suspension (125 mg/5 mL and 250 mg/5 mL), and powder for injection (500 mg and 1 g) for use via the intramuscular (IM) or intravenous (IV) routes.


Standard Dosing and Frequency

Adult dosing typically follows established regimens. For oral use, the typical regimen ranges from 250 mg every 6 hours (q6h) to 1 g every 12 hours (q12h). The parenteral regimen generally consists of 0.5 g to 1 g q6h, with a maximum daily dose of up to 8 g reserved for severe systemic infections. Doses are administered without regard to meals.


Specific Administration Conditions and Duration

The powder for injection must be reconstituted before use; IV administration should be performed slowly, over a 3 to 5 minute period. For children aged 9 months and older, the daily dose is determined by weight, typically 25 to 50 mg/kg/day divided into two to four doses. A primary consideration is the patient's renal function, as individuals with impaired kidney function require a dose reduction or interval lengthening to prevent accumulation. The duration of therapy is defined by the type of pathogen, requiring a minimum of 10 days of continuous administration for streptococcal infections to ensure complete eradication.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Lacef

The evidence for the use of Lacef (Cephradine) is based on studies that describe the drug's activity against susceptible bacteria within the first-generation cephalosporin class. This research, including controlled trials and clinical studies, explores its application in several clinical contexts.


Evidence for Use in Urinary Tract Infections (UTIs)

Research on Cephradine for UTIs includes short-term Randomized Controlled Trials (RCTs). The trials measured outcomes related to physical discomfort (like painful urination) and bacteriological eradication (the clearance of the target bacteria from the urine), exploring how these factors change over the study period. Studies report measurements of bacteriological clearance and observed patterns of symptom change within the short course of therapy. Evidence is limited for assessing recurrence or resistance development over extended periods.


Evidence for Use in Skin and Soft Tissue Infections (SSTIs)

Evidence for SSTIs includes controlled clinical trials. Research examined outcomes linked to inflammatory or irritative states, focusing on clinical response (changes in localized swelling, redness, and pain) and bacteriological eradication. Research describes patterns of bacteriological clearance against susceptible staphylococci and streptococci. Data remains insufficient regarding activity against newer antibiotic-resistant strains, which have emerged since the primary research was conducted.


Evidence for Use in Surgical Prophylaxis

Cephradine was studied for preventing infections in patients undergoing certain surgeries, particularly clean-contaminated procedures. The research consists of Randomized Controlled Trials (RCTs) and meta-analyses. Findings describe patterns observed in the studies, with clinical trials reporting lower measurements of postoperative infection rates in the treated groups compared to controls for specific procedures. Comparative evidence is lacking to provide definitive comparative data against all other modern prophylactic antibiotics.


Research Gaps and Uncertainty

Data are still emerging regarding the drug's activity against new strains of bacteria that have developed resistance. The durability of the response beyond the initial weeks after treatment is not fully established by controlled trials, and subgroup findings are uncertain regarding the evaluation of Cephradine in severe or complicated infections.

Frequently Asked Questions (FAQ)

Common questions about Lacef (FAQ)


Q: Are there any long-term health concerns associated with using Lacef?

The official label notes that prolonged use of Cephradine is associated with the risk of developing a superinfection. A superinfection is a new infection that occurs while a patient is already being treated for a different infection. Regulatory documents do not define a specific time limit but indicate that use should not exceed necessary duration.


Q: Why do some people need to take Lacef for a long period?

The required duration of treatment is determined by the specific type of bacterial infection being treated. Official product information states that for infections like those caused by streptococci, a minimum of 10 days of continuous administration is often required. This duration is noted to ensure the complete bacterial eradication, which aims to prevent recurrence of the infection.


Q: How does the body eliminate Lacef?

Cephradine is eliminated from the body primarily through the kidneys, a process known as renal excretion. The drug is described in regulatory documents as being removed from the body largely unchanged in the urine. Because the clearance relies on kidney function, official documents require specific dosing considerations for patients with reduced renal function.


Q: Why might a patient need to stop taking Lacef suddenly?

Regulatory documents list severe events that may require immediate cessation of the medicine, such as signs of a severe allergic reaction or other serious adverse conditions. Examples of these reactions include anaphylaxis or the development of an antibiotic-associated condition like Pseudomembranous Colitis.


Q: Is there a maximum amount of time someone can safely be on Lacef?

Official safety documents do not define a specific maximum duration of therapy for Lacef. The length of administration is typically determined by the infection being treated. However, official information warns that prolonged use of the antibiotic is associated with a risk of developing a superinfection.


Q: Is there a requirement for monitoring while taking Lacef?

There is a mandatory requirement for monitoring in certain patient populations. For individuals with known or suspected impaired renal function (kidney disease), official drug labeling requires mandatory monitoring of kidney function. This monitoring requirement is in place because the medicine is primarily eliminated by the kidneys.


Q: Can Lacef be taken by older adults?

Use in the geriatric population (older adults) is described as conditional. Regulatory documents note that dosage adjustments may be necessary if reduced renal function is present. This is a special consideration because the kidneys clear the drug from the body.


Q: Is it normal to feel tired after starting Lacef?

Official adverse reaction lists for Cephradine have reported instances of unusual tiredness or extreme fatigue. Official safety documentation notes that the incidence of this side effect is rare or occurs at an unknown frequency. Official patient information notes that any concerning new symptoms should be reported to a healthcare provider.


Q: Can Lacef affect how I sleep?

Official drug safety information for Cephradine includes sleepiness and insomnia (difficulty sleeping) as reported side effects. These effects are generally noted as rare occurrences. Official information indicates that persistent changes in sleep patterns should be reported to a healthcare provider.


Q: Is Lacef a controlled substance?

According to regulatory agencies, Cephradine is classified as a prescription-only medicine. It is not classified as a federally controlled substance under US or equivalent international regulations, meaning it does not carry a risk of dependence or addiction.


Q: Where can I find the official prescribing information for Lacef?

The official prescribing information for Cephradine is published by government health authorities and is publicly accessible. This information, such as the FDA Label or the Summary of Product Characteristics, can be located through official databases like DailyMed, maintained by the US National Institutes of Health.


Q: What should I do if I experience a severe reaction to Lacef?

Official patient information states that emergency medical attention is required immediately if signs of a severe allergic reaction are observed. Key signs that require prompt attention include hives, difficulty breathing, or swelling of the face, lips, tongue, or throat.


Q: Is Lacef known to cause dizziness or affect driving?

Official safety information lists dizziness as an infrequent side effect of Cephradine. Official documents describe that patients should use caution before driving or operating machinery if they experience dizziness or any other side effect that could potentially affect concentration or motor skills.


Q: What is the intended duration of the effect of Lacef?

The intended duration of the drug’s concentration in the body can be measured by its serum half-life. Regulatory documents state that following an oral dose, the half-life of Cephradine (the time it takes for the concentration to be reduced by half) is approximately 0.5 to 1.2 hours. This figure is descriptive of its elimination rate.

How should Lacef be stored and disposed of?

How to Store and Dispose of Lacef (Cephradine)

The storage requirements for Lacef (Cephradine) are specified based on the medicine's form to maintain stability.

Storage Requirements

Item Requirement
Dry Powder/Capsules Store at a temperature not exceeding 30 C and keep the container tightly closed.
Reconstituted Suspension Must be stored under refrigeration (2 C to 8 C) and must not be frozen.
Stability Period The refrigerated liquid suspension is stable for 14 days.
Child Safety Must be kept out of the sight and reach of children.

Disposal

To dispose of unused or expired Lacef, do not throw the product into household waste or flush it down the toilet. Follow local regulations, which typically involve returning the medicine to a pharmacy through a drug take-back program or following specific household disposal guidelines.

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

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