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# Tafenix/Genixim (Cefixime)
## Overview
Cefixime is a third-generation cephalosporin antibiotic that inhibits bacterial cell wall synthesis by binding to penicillin-binding proteins (PBPs). It demonstrates broad-spectrum activity against many Gram-negative bacteria (including *Neisseria gonorrhoeae*, *Haemophilus influenzae*, and *Moraxella catarrhalis*) but has limited activity against Gram-positive organisms (e.g., *Staphylococcus aureus*).
## Primary Indications
* Uncomplicated gonorrhea (cervical, urethral, rectal).
* Otitis media.
* Pharyngitis and tonsillitis.
* Acute bronchitis and acute exacerbations of chronic bronchitis.
* Uncomplicated urinary tract infections.
## Adult Dosing
* **Gonorrhea:** 800 mg orally as a single dose.
* **Respiratory/UTI/Other:** 400 mg daily, administered as a single dose or divided into 200 mg every 12 hours.
## Pediatric Dosing
* **General infections (Children >6 months):** 8 mg/kg/day orally as a single dose or divided into 4 mg/kg every 12 hours.
* **Maximum:** Do not exceed 400 mg/day in pediatric patients.
## Dose Adjustments
* **Renal Impairment (CrCl 21–60 mL/min):** Reduce dose to 75% of the standard dose.
* **Renal Impairment (CrCl <20 mL/min or hemodialysis):** Reduce dose to 50% of the standard dose. No supplemental dose is necessary after hemodialysis.
## Contraindications
* Known hypersensitivity to cefixime or other cephalosporins.
* History of severe allergic reaction (e.g., anaphylaxis) to penicillins or other beta-lactams.
## Adverse Effects
* **Common:** Diarrhea (very frequent), nausea, abdominal pain, dyspepsia.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (rash, anaphylaxis), seizures (rare, mostly in renal failure), and elevation of liver enzymes.
## Key Drug Interactions
* **Anticoagulants:** May enhance the effects of warfarin (monitor INR).
* **Probenecid:** Increases serum concentrations of cefixime by inhibiting renal tubular secretion.
* **Carbamazepine:** Cefixime may rarely alter serum levels; monitor if toxicity is suspected.
## Monitoring
* Monitor for signs of superinfection (e.g., persistent diarrhea, oral candidiasis).
* Monitor renal function in patients on long-term therapy or with pre-existing renal impairment.
* Evaluate for hypersensitivity symptoms during the first dose.
## Clinical Pearls
* Cefixime is generally not effective against *Staphylococcus* species; do not use for skin/soft tissue infections caused by these organisms.
* Diarrhea is a dose-dependent side effect; advising patients to take the medication with food may mitigate minor GI distress, though food does not significantly alter overall absorption.
* The suspension form must be refrigerated and discarded after 14 days.
* Always confirm local antimicrobial stewardship guidelines, as resistance patterns for *N. gonorrhoeae* can vary regionally.
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**Disclaimer: This information is for educational purposes only. Always verify current prescribing information, institutional guidelines, and drug compatibility via a reliable clinical database (e.g., Lexicomp, UpToDate) before prescribing or administering medication.**
