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Cefixime

Cefixime: Generic Medication Overview

Cefixime is a broad-spectrum oral antibiotic belonging to the third-generation cephalosporin class. It is supplied as a pill in strengths of 100 mg and 200 mg. In the United Kingdom, cefixime is a prescription-only medicine (POM) regulated by the Medicines and Healthcare products Regulatory Agency (MHRA). It is prescribed for a range of bacterial infections where the causative organisms are known or strongly suspected to be sensitive to this drug.

How Cefixime Works in the Body

Cefixime exerts its antibacterial effect by binding to penicillin-binding proteins (PBPs) located on the bacterial cell wall. This inhibits the final stages of peptidoglycan synthesis, weakening the wall and leading to cell lysis and death. Because cefixime is a β-lactam antibiotic, it is most active against Gram-negative organisms such as Escherichia coli, Klebsiella pneumoniae, and Neisseria gonorrhoeae, while retaining activity against several Gram-positive species. The drug is absorbed well after oral ingestion, reaching peak plasma concentrations within 2-3 hours. It is primarily eliminated unchanged by the kidneys, so renal function influences its clearance.

Conditions Treated by Cefixime

Cefixime is approved by the MHRA for the following adult indications:

• Uncomplicated urinary tract infections (UTIs) caused by susceptible E. coli and other Enterobacteriaceae.
• Gonorrhoea (especially uncomplicated urogenital infection) when the organism is susceptible.
• Community-acquired pneumonia where Streptococcus pneumoniae and certain atypical pathogens are likely.
• Acute otitis media and sinusitis caused by susceptible bacteria.
• Pharyngeal and tonsillar infections, including streptococcal pharyngitis, when penicillin allergy precludes first-line therapy.

These indications are based on the drug’s spectrum of activity, pharmacokinetic profile, and clinical trial data reviewed by the MHRA.

Off-Label and Investigational Applications

Evidence from peer-reviewed studies suggests that cefixime has been explored for:

• Prophylaxis of postoperative infections in certain urological procedures.
• Treatment of multidrug-resistant Neisseria gonorrhoeae when standard regimens fail, although resistance patterns vary regionally.

These uses are not approved by the MHRA and should only be considered under specialist supervision with careful risk-benefit assessment.

Evaluating Cefixime for Your Health Profile

Who is most likely to benefit

• Adults with confirmed or strongly suspected infections caused by cefixime-susceptible bacteria.
• Patients with a documented penicillin allergy who require a β-lactam alternative with similar coverage.

Absolute contraindications

• Known hypersensitivity to cefixime, any cephalosporin, or β-lactam antibiotics.
• Severe renal impairment (eGFR < 30 mL/min/1.73 m²) when dosing cannot be appropriately adjusted.

Relative contraindications and cautions

• Moderate renal impairment (eGFR 30-50 mL/min/1.73 m²) - dose reduction may be needed.
• History of colitis, especially Clostridioides difficile infection.
• Pregnancy (category B in the UK) - generally considered safe, but use only when clearly needed.
• Breastfeeding - small amounts are excreted in milk; continue if benefits outweigh risks.

Special populations

• Elderly patients may have reduced renal function; monitoring is advised.
• Pediatric use is not covered in this adult-focused article; separate pediatric dosing guidelines exist.

If any of these conditions apply, a healthcare professional should evaluate the suitability of cefixime.

Safety Profile and Interactions

Common Side Effects

• Gastro-intestinal upset (nausea, diarrhoea, abdominal pain) - usually mild and transient.
• Rash or mild skin irritation - often resolves without intervention.
• Headache - reported in a minority of patients.

Serious Adverse Events

• Severe allergic reactions (anaphylaxis, Stevens-Johnson syndrome) - require immediate medical attention.
• Clostridioides difficile-associated diarrhoea - can be life-threatening; discontinue the antibiotic if suspected.
• Hepatic dysfunction (elevated transaminases) - monitor liver enzymes if prolonged therapy is needed.

Drug Interactions

• Probenecid - decreases renal excretion of cefixime, increasing plasma concentrations; dose adjustment may be required.
• Warfarin - occasional reports of increased INR; monitor coagulation status when initiating or stopping cefixime.
• Oral contraceptives - cefixime may reduce efficacy; consider additional contraceptive measures.

Food and Lifestyle Interactions

• Cefixime can be taken with or without food; a high-fat meal may delay absorption slightly but does not affect overall exposure.
• Alcohol does not have a known direct interaction, but excessive intake may exacerbate gastrointestinal side effects.
• No specific restrictions on operating machinery; however, severe dizziness or visual disturbances warrant caution.

Patients should disclose all current medications, supplements, and herbal products to their prescriber before starting cefixime.

How to Take Cefixime

• Standard adult dosing: 200 mg taken once daily for uncomplicated infections, typically for 5-7 days.
• Alternative regimens: For certain infections, a single 400 mg dose (two 200 mg pills) may be prescribed; this exceeds the listed dosage range and should only be used when specifically instructed by a prescriber.

Administration tips

• Swallow tablets whole with a full glass of water.
• If the 100 mg tablet is prescribed, it may be taken twice daily to achieve the same total daily dose, but only if directed by a clinician.
• Missed dose: take it as soon as remembered unless the next scheduled dose is near; do not double the dose.

Renal adjustment

• For patients with eGFR 30-50 mL/min/1.73 m², the daily dose may be reduced to 200 mg once daily or 100 mg twice daily, based on clinical judgement.

Overdose

• Symptoms may include nausea, vomiting, diarrhoea, and abdominal cramps. Severe cases can lead to seizures or renal dysfunction. Seek emergency medical care; supportive measures are the mainstay of treatment.

Discontinuation

• No tapering is required for cefixime. Therapy can be stopped after the prescribed course, even if symptoms improve, to prevent resistance.

Monitoring While on Cefixime

• Clinical response: reassess signs and symptoms after 48-72 hours; lack of improvement may indicate resistant infection or need for alternative therapy.
• Renal function: baseline serum creatinine; repeat if renal impairment is known or suspected.
• Liver enzymes: consider monitoring in patients on prolonged courses (>10 days) or with pre-existing hepatic disease.

If any adverse reaction arises, contact a healthcare professional promptly.

Storage and Handling

• Store tablets at room temperature (15-25 °C) away from moisture and direct sunlight.
• Keep the container tightly closed and out of reach of children.
• Do not use tablets that have changed colour, appearance, or have passed the expiry date indicated on the packaging.
• Dispose of unused medication via a pharmacy take-back scheme or according to local waste-disposal regulations.

Medication-Specific Glossary

Cephalosporin

A class of β-lactam antibiotics structurally related to penicillins, divided into generations based on antimicrobial spectrum.

Penicillin-Binding Protein (PBP)

Enzymes involved in bacterial cell-wall synthesis; binding of β-lactam antibiotics inhibits their activity, leading to bacterial death.

β-lactamase

An enzyme produced by some bacteria that hydrolyses the β-lactam ring, rendering antibiotics like cefixime ineffective.

Pharmacokinetics

The study of how a drug is absorbed, distributed, metabolised, and excreted by the body.

eGFR (estimated Glomerular Filtration Rate)

A calculation used to assess kidney function; important for dosing renally excreted drugs such as cefixime.

Clostridioides difficile

A bacterium that can cause severe colitis after disruption of normal gut flora by antibiotics.

Medical Disclaimer

This article provides educational information about cefixime and is not a substitute for professional medical advice. Treatment decisions, including use for unapproved indications, must be made under the guidance of a qualified healthcare provider. The content is intended for informational purposes and does not constitute medical recommendations. Always consult a physician before starting, stopping, or changing any medication regimen.