Cefaclor Alkaloid

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Medically reviewed

Marina Burgos

Last updated on 10/01/2026

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 Cefaclor Alkaloid

Property Description
Active Ingredient Cefaclor
Form Oral capsule, tablet, and suspension
Pharmacological Class Cephalosporin antibiotic (Second-generation)
General Purpose To eliminate bacterial infections
Origin Semi-synthetic compound

Cefaclor Alkaloid is a semi-synthetic medicinal compound and an effective antibacterial agent used to resolve systemic infections caused by susceptible organisms. Its core chemical identity is Cefaclor, the sole active ingredient in this product. The drug is classified within the cephalosporin antibiotic family, specifically recognized as a second-generation cephalosporin, and is chemically derived from 7-aminocephalosporanic acid. This classification is clinically recognized for its balanced spectrum against both Gram-positive and specific Gram-negative bacteria, making it suitable for common community-acquired bacterial illnesses.


What Type of Medicine is Cefaclor Alkaloid?

Cefaclor is an antibiotic belonging to the beta-lactam family. The medication's fundamental purpose is defined by its bactericidal action, meaning it actively kills infectious bacteria rather than merely pausing their growth. Cefaclor achieves this by interfering with the synthesis of the bacterial cell wall, a process essential for the bacteria’s survival and replication. This mode of action provides a highly specific method for clearing infections, and Cefaclor is frequently designated as a standard treatment for typical respiratory tract infections.


Which Pharmaceutical Forms of Cefaclor are Available?

Cefaclor is formulated exclusively for oral administration, ensuring accessibility and convenience for patients. It is available in several high-level dosage forms, including the traditional oral capsule, an oral suspension prepared from granules, and an oral tablet. A key feature of Cefaclor is the availability of both immediate-release and extended-release tablet variations, offering prescribers flexibility in maintaining therapeutic concentrations. This formulation variety, which includes brand names like Ceclor and Keflor, ensures broad suitability for patient groups.

Regulatory References

  1. NIH MedlinePlus Drug Information

What side effects are possible with Cefaclor Alkaloid?

Possible Side Effects and Safety Information

This information describes the documented safety profile and potential adverse reactions of Cefaclor Alkaloid, as detailed in official government regulatory documents.


Adverse Reactions by Frequency and System

Adverse reactions are classified based on the frequency observed in clinical data, involving several System-Organ Classes:

  • Common (1% to 10%): Includes gastrointestinal effects such as diarrhea and nausea, and rash or morbilliform eruptions (skin reaction).
  • Uncommon (0.1% to 1%): Effects on the blood and lymphatic system, such as eosinophilia and lymphocytosis, and potential effects on the reproductive system like vaginitis or vaginal candidiasis.
  • Rare (0.01% to 0.1%): Includes transient changes in liver function tests, reversible interstitial nephritis, cholestatic jaundice, and transient hepatitis.

Clinically Significant and Serious Reactions

The most serious safety concerns relate to Hypersensitivity Reactions and severe gastrointestinal issues:

  • Hypersensitivity: Severe, immediate reactions like anaphylaxis (including fatal cases) are possible. A unique reaction known as a serum-sickness-like reaction has also been documented, reported more frequently in children. Severe dermatologic reactions, including Stevens-Johnson Syndrome (SJS) and Toxic Epidermal Necrolysis (TEN), are rare but serious.
  • Gastrointestinal: The development of pseudomembranous colitis (often caused by Clostridium difficile) is a recognized, potentially life-threatening risk following antibiotic use.
  • Nervous System: Seizures have been reported, particularly in patients with impaired renal function.

Safety Considerations and Restrictions

Cefaclor is contraindicated in individuals with a known allergy to Cefaclor, other cephalosporin antibiotics, or a history of immediate-type anaphylactic reaction to penicillins. Caution is advised for patients with a history of other penicillin hypersensitivity reactions, gastrointestinal disease (especially colitis), or impaired renal function. The official safety profile notes the potential for interaction with oral anticoagulants (e.g., Warfarin), which may require monitoring, and the possibility of false-positive results in certain urine glucose tests.

Overdose and Emergency Response

Overdose and when to seek help

Documented Overdose Manifestations

Overdose of Cefaclor Alkaloid may present with primarily non-specific gastrointestinal symptoms, including nausea, vomiting, diarrhea, and epigastric distress. Regulatory information states that the severity of the gastrointestinal symptoms is officially dose-related. A potential severe neurological outcome is the risk of seizures, particularly noted in patients with renal impairment where the drug’s half-life may be slightly prolonged.


Emergency Actions and Management

Regulatory guidance specifies that individuals must seek medical attention immediately at the first sign of any adverse drug reaction. In the event of seizures associated with the drug, official documentation requires that the medicine be discontinued, and anticonvulsant therapy provided if clinically indicated.

Treatment for Cefaclor overdose is defined as mainly supportive, as no specific antidote is known. Gastric lavage is required only when the ingested dose is high, specifically more than 5 times the normal daily dose. Procedures such as forced diuresis, peritoneal dialysis, and charcoal hemoperfusion are officially stated as not established as beneficial for management.

Therapeutic Uses of Cefaclor Alkaloid

What Cefaclor Alkaloid Treats: Main Uses and Benefits

Cefaclor Alkaloid is generally applied in contexts where short-term symptomatic assistance is needed and may be part of symptomatic management across conditions involving inflammatory or irritative processes. It helps address symptom clusters that create noticeable interference with daily stability, offering support that helps ease the overall symptom burden of heightened physiological activity across several key therapeutic areas. The drug is commonly used across conditions presenting with acute episodes. Cefaclor is applicable within clinical settings that involve acute or disruptive symptom patterns.


The medication is relevant for easing symptoms across conditions presenting with acute episodes, including respiratory tract infections (like otitis media, pharyngitis, and bronchitis), uncomplicated skin and skin structure infections, and episodes in the urinary tract (such as cystitis). The therapeutic approach focuses on addressing pronounced local symptoms like ear pain, sore throat, swelling, fever, and painful urination.

“The use of this medication is relevant in clinical settings marked by acute presentations where supportive symptom management is appropriate.”

This application assists with maintaining functional stability and may contribute to improved day-to-day comfort during symptomatic periods.


Quick Fact: Context for Symptom Management Cefaclor is commonly used to help with symptom clusters that appear suddenly, such as localized pain, swelling, and fever, relevant in clinical settings that involve acute or unstable symptom patterns.

Eligibility and Restrictions for Use

Who Can and Cannot Use Cefaclor Alkaloid?

Eligibility for Cefaclor is strictly defined by regulatory documents, focusing on patient characteristics and pre-existing conditions.

Contraindications (Who Must Not Use)

Cefaclor is contraindicated in patients with a known hypersensitivity to the drug itself or to any other cephalosporin antibiotic. Patients with Porphyria are also excluded according to some international labeling.

Age and Life Stage Eligibility

Population Eligibility Status Restriction/Caution
Adults Approved Standard use
Pediatric (Under 1 Month) Use Not Established Safety and effectiveness are not established for infants under one month of age.
Pregnant Women Conditional Use Classified as Category B; use is restricted to cases where it is clearly needed.
Nursing Mothers Conditional Use Caution is required as trace amounts are detected in breast milk and the effect on infants is not known.

Condition-Based Restrictions

Use requires caution in patients with a history of Penicillin hypersensitivity due to the potential for cross-reactivity. Conditional use is also mandated for individuals with markedly impaired renal function and a history of gastrointestinal disease, particularly colitis.

What should I know about interactions with other medicines?

Interaction Map: Interactions with other medicines and products — official regulatory information for Cefaclor Alkaloid

Interaction scope

Medicinal product categories with documented interactions:

  • Anticoagulants (Oral)
  • Nephrotoxic medicinal products
  • Antacids (Aluminum or Magnesium-containing)
  • Uricosuric agents (Probenecid)
  • Oral Contraceptives
  • Live Bacterial Vaccines

Specific interacting medicines (if explicitly listed):

  • Probenecid, Warfarin, Aminoglycosides

Mechanistic basis of interactions (only if stated in label):

  • Inhibition of renal tubular secretion (by Probenecid, leading to reduced clearance).

Timing-based interaction rules (if applicable):

  • Aluminum- or Magnesium-containing Antacids must not be administered within 1 hour of Cefaclor due to absorption interference.

Population-specific interaction notes (if applicable):

  • Patients with reduced renal function: The serum half-life is slightly prolonged, but dosage adjustments are generally not required for moderate or severe impairment.

Interaction-related restrictions:

  • Formal monitoring of prothrombin time is required when co-administering with oral anticoagulants.

Interaction classifications (high-level)

Interaction severity classification (as defined in official documents):

  • Interactions are classified as clinically significant or major requiring monitoring or timing separation; no specific drug-drug combination is formally classified as contraindicated.

Regulatory basis (EMA / FDA / etc.):

  • All statements are based on official information from government regulatory documents.

Interaction-context constraints (as defined in official documents):

  • The interaction with food is documented as a constraint on the maximum concentration achieved (Cmax), resulting in a 50–75% reduction.

Resulting interaction structure

Official interaction statements:

  • Co-administration with Probenecid results in increased and prolonged Cefaclor serum concentrations.
  • The use of oral anticoagulants (such as Warfarin) may enhance the anticoagulant effect, increasing the risk of bleeding.
  • Aluminum- or Magnesium-containing Antacids diminish absorption and require a minimum 1-hour separation from administration.
  • Cefaclor may decrease the therapeutic efficacy of estrogen-containing oral contraceptives and live bacterial vaccines.
  • Simultaneous use with other nephrotoxic medicinal products may increase the risk or severity of nephrotoxicity.

Connection to the overall interaction profile (2–4 sentences):

This interaction profile is structured by documented patterns affecting the product's pharmacokinetics via reduced renal clearance and interference with gastrointestinal absorption. The profile also outlines several important pharmacodynamic interactions, focusing on the potential enhancement of anticoagulant effects and the reduction in efficacy of certain co-administered agents as officially described in government regulatory documents.

Mechanism of Action

Cefaclor is a second-generation cephalosporin, a beta-lactam antibiotic, designed to interfere with bacterial cell wall biosynthesis. The mechanism relies on targeting specific bacterial enzymes known as Penicillin-Binding Proteins (PBPs), which act as transpeptidases. Cefaclor achieves its effect by forming a stable, covalent bond with the active site of these PBPs. This binding event inhibits the transpeptidase activity required for the final stages of cell wall construction. Specifically, it prevents the cross-linking of linear peptidoglycan chains, which are essential for forming the strong, rigid structure necessary for bacterial survival. The resulting deficit in structural integrity renders the cell wall unstable. This mechanistic cascade leads directly to an osmotically-induced imbalance, culminating in the lysis of the bacterial cell. The activity of Cefaclor is entirely focused on disrupting this critical bacterial physiological process.

Dosage and Administration Information

Cefaclor Alkaloid is an antibiotic prescribed exclusively for oral administration, available in capsule, tablet, and suspension forms. The dosing schedule is defined by the specific formulation. Immediate-release (IR) forms, which include the capsule and suspension, are typically administered every 8 hours (three times daily), with a usual adult dose of 250 mg. The dosage may be increased for more severe situations, up to a maximum of 4 grams per day. Conversely, extended-release (ER) tablets follow a twice-daily (every 12 hours) regimen.


Administration Requirements

Proper administration involves specific rules regarding timing and preparation. IR forms and the reconstituted suspension can be taken with or without food. However, extended-release tablets must be taken with meals to ensure optimal use. ER tablets have procedural restrictions: they must be swallowed whole and cannot be cut, crushed, or chewed. The oral suspension must be reconstituted by adding the specified amount of water and shaken well before each dose.


Duration and Special Populations

Administration is time-bound, with the course duration dependent on the infection. For infections caused by beta-haemolytic streptococci, the medication must be maintained for a minimum of 10 days. The course is generally continued for at least 48 to 72 hours after a patient becomes asymptomatic. Dosing for pediatric patients (one month and older) is based on body weight, typically 20 to 40 mg/kg/day divided into smaller doses. Dosage adjustment for older adults or those with moderate renal impairment is not usually required when following standard label instructions.

Recent Clinical Evidence

Research evidence / Overview of Studies for Cefaclor Alkaloid

The research base for Cefaclor Alkaloid primarily focuses on short-term clinical trials that examined its activity against susceptible bacteria across its main therapeutic areas. The evidence base contributes to understanding the patterns of its activity observed in research settings, and study results reflect the specific conditions under which they were conducted. Findings describe group patterns, not personal outcomes.


Evidence for Use in Respiratory Tract Infections

The most substantial research has been conducted for conditions characterized by acute or disruptive episodes, such as otitis media (ear infection), pharyngitis, and pneumonia. Studies exploring short-term symptom changes often took the form of Randomized Controlled Trials (RCTs). Researchers monitored whether the identified bacterial pathogen was eradicated (bacteriological eradication) and examined outcomes related to functional imbalance and physical discomfort in both adults and children (pediatric patients).

Studies reported patterns observed in the treatment cohorts, including clinical response measurements and rates of pathogen eradication. However, substantial data establishing the medicine’s role in the subsequent prevention of rheumatic fever are not fully established. Additionally, the appropriateness of the indication for secondary bacterial infections of acute bronchitis was determined to be inappropriate by some regulatory bodies.


Evidence for Use in Skin and Urinary Tract Infections

Clinical trials were also conducted for uncomplicated skin and skin structure infections and urinary tract infections (UTIs). Research has explored the medicine's activity in comparative studies, measuring outcomes related to physical discomfort and linked to inflammatory states. Trials reported clinical response measurements observed during the defined study intervals, contributing to the understanding of bacteriological patterns in these body systems.

Clinical trials to confirm activity against all organisms that appear susceptible during laboratory testing (in vitro) have not been conducted in adequate and controlled clinical trials. Furthermore, data remain insufficient for patients with markedly impaired renal function, as clinical experience is limited in this subgroup.


What Remains Uncertain: Research Gaps and Limitations

Evidence is limited regarding long-term outcomes and the maintenance of observed patterns after the acute infection has resolved, as most trials monitored patients over defined short-term intervals. Efficacy has not been established for use in infants less than one month of age, as data for this specific population are insufficient.

Frequently Asked Questions (FAQ)

Common questions about Cefaclor Alkaloid (FAQ)


Q: Is Cefaclor Alkaloid used to treat common colds or the flu?

Cefaclor Alkaloid is an antibiotic prescribed exclusively to treat infections caused by susceptible bacteria. According to official product information, this medication is not effective against illnesses caused by viruses, such as the common cold or influenza (the flu).


Q: Does Cefaclor Alkaloid have a different purpose than other common antibiotics?

Official classifications state that Cefaclor Alkaloid belongs to the family of cephalosporin antibiotics, specifically recognized as a second-generation type. This classification defines its general purpose and the range of bacteria it is designed to target, which differs from antibiotic classes like penicillin.


Q: What is the difference between Cefaclor Alkaloid and the brand name Ceclor?

Cefaclor is the chemical name for the active ingredient in the medicine. Cefaclor Alkaloid refers to the drug product containing this ingredient. Ceclor is a registered trade name (brand name) under which the same active ingredient has been commercially available.


Q: Why can antibiotics like Cefaclor Alkaloid cause yeast infections?

Official reports list vaginal candidiasis, a type of yeast infection, as a potential side effect. This is because Cefaclor Alkaloid, like other antibiotics, is designed to eliminate bacteria. This action can sometimes disrupt the natural balance of microorganisms (flora) in the body, which can allow non-bacterial organisms, such as fungi, to overgrow.


Q: What are the signs of a severe allergic reaction to Cefaclor Alkaloid?

Official prescribing information states that severe, immediate hypersensitivity reactions like anaphylaxis are possible. Signs of this serious reaction can include sudden trouble breathing, swelling of the face, lips, tongue, or throat, or a severe, widespread skin rash with blisters or peeling. These serious reactions necessitate immediate medical attention.


Q: Is it safe to take Cefaclor Alkaloid with common pain relievers like Tylenol (acetaminophen) or ibuprofen?

The official interaction map for Cefaclor Alkaloid does not classify common pain relievers like acetaminophen or ibuprofen as major interacting medicines requiring strict avoidance or monitoring. However, official information suggests caution when combining Cefaclor with certain drug classes, such as NSAIDs (which includes ibuprofen), due to a potential impact on kidney function.


Q: Does Cefaclor Alkaloid interact with any vitamins or supplements?

Official documents emphasize the importance of communicating all prescription and non-prescription products to the prescribing healthcare provider. This includes reporting any vitamins, nutritional supplements, or herbal products being taken. Specific warnings for general vitamins are not commonly listed in the official interaction sections.


Q: What happens if I miss a scheduled time for Cefaclor Alkaloid?

Official product information contains a specific procedure to follow if a dose is missed, which varies based on the proximity to the next scheduled administration time. This guidance outlines the process for taking a missed dose or skipping it if it is too close to the next scheduled time. A core principle of the guidance is that doubling the dose is not recommended.


Q: Why is it important to finish the full course of Cefaclor Alkaloid even if I feel better?

Official patient guidelines describe the importance of maintaining the treatment duration, even when symptoms improve. This is crucial because stopping early may allow the infection to persist if all the bacteria have not been eliminated. Furthermore, improper use is noted as a factor that can contribute to the development of antibiotic-resistant bacteria.


Q: Can Cefaclor Alkaloid cause changes in mood or behavior?

Official reports indicate that effects on the central nervous system are rare. These effects have included reversible hyperactivity, agitation, nervousness, and in some cases, confusion or insomnia. These are not classified as common side effects.


Q: Is it normal to feel tired or dizzy while on Cefaclor Alkaloid?

According to reports on different formulations, effects like dizziness and somnolence (tiredness or sleepiness) have been documented. While reported, these are generally not classified among the most common adverse events experienced by patients.


Q: Can Cefaclor Alkaloid cause a headache?

Headache is a recognized side effect that has been documented with the use of this medicine. For certain formulations, such as the extended-release tablets, headache is listed in the official documents as a common adverse event, occurring in 1% to 10% of patients in clinical data.


Q: Does Cefaclor Alkaloid interact with alcohol?

While Cefaclor Alkaloid is not typically associated with the severe disulfiram-like reaction seen with some other antibiotics, some official warnings advise that the use of alcohol may need to be avoided or limited while taking this medication.


Q: Can I share my Cefaclor Alkaloid prescription with someone else with a similar infection?

Official patient information clearly states that this prescription medication is intended only for the individual patient for whom it was prescribed. Sharing the medication is not advised due to the risks of improper use and potential for harm.

How should Cefaclor Alkaloid be stored and disposed of?

How to Store and Dispose of Cefaclor Alkaloid?

The official storage requirements for Cefaclor depend on the pharmaceutical form.

  • Capsules and Tablets: Store at Controlled Room Temperature, typically 15 C to 30 C (59 F to 86 F). The solid forms must be kept in the original container, tightly closed, and protected from excess heat and moisture and dispensed in a light-resistant container.

  • Oral Suspension (Reconstituted Liquid): This form must be stored under refrigeration (2 C to 8 C or 36 F to 46 F) and must not be frozen. Any unused portion of the liquid suspension must be discarded after 14 days of reconstitution.

Disposal and Protection

The product must be stored out of the sight and reach of children. Regarding disposal, the official instructions prohibit flushing the medicine down the toilet or pouring it into a drain. Unused or expired medication should be discarded according to local regulatory requirements for pharmaceutical waste or returned to a designated collection point.

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

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