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# Genixim (Cefixime)
## Overview
Genixim is a third-generation cephalosporin antibiotic. It is administered orally and functions by inhibiting bacterial cell wall synthesis. It possesses broad-spectrum activity against many Gram-negative bacteria but has limited efficacy against Gram-positive organisms (e.g., *Staphylococcus aureus*).
## Primary Indications
* Uncomplicated urinary tract infections (UTIs)
* Otitis media
* Pharyngitis and tonsillitis
* Uncomplicated gonorrhea (cervical, urethral, rectal)
## Adult Dosing
* **General infections:** 400 mg once daily or 200 mg every 12 hours.
* **Uncomplicated Gonorrhea:** 800 mg (two 400 mg tablets) as a single oral dose.
## Pediatric Dosing
* **Recommended dose:** 8 mg/kg/day, administered once daily or in two divided doses (4 mg/kg every 12 hours).
* **Maximum:** 400 mg/day.
* **Otitis media:** May use 8 mg/kg once daily.
## Dose Adjustments
* **Renal Impairment (CrCl <60 mL/min):** Requires dose reduction.
* CrCl 21–60 mL/min: 75% of the standard dose.
* CrCl <20 mL/min: 50% of the standard dose.
* **Hepatic Impairment:** No specific adjustment guidelines exist; use with caution.
## Contraindications
* Known hypersensitivity (anaphylaxis) to cefixime or any cephalosporin antibiotics.
* History of severe allergic reactions (e.g., anaphylaxis, Stevens-Johnson syndrome) to penicillins.
## Adverse Effects
* **Common:** Diarrhea (frequently dose-dependent), nausea, abdominal pain, dyspepsia.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (rash, urticaria, serum sickness), and rare instances of hemolytic anemia or seizure (in patients with severe renal impairment).
## Key Drug Interactions
* **Anticoagulants:** May increase the anticoagulant effect of warfarin (monitor INR).
* **Probenecid:** Decreases renal excretion of cefixime, potentially increasing plasma levels and risk of toxicity.
* **Vaccines:** Avoid administration of live typhoid vaccine with antibiotics.
## Monitoring
* Monitor for signs of superinfection or diarrhea (specifically *C. difficile*).
* Assess renal function (serum creatinine/CrCl) if therapy is extended or in elderly populations.
* Monitor for signs of allergic reaction during the first dose.
## Clinical Pearls
* Cefixime is generally not recommended for the empiric treatment of *Staphylococcus* infections.
* The suspension form should be shaken well before use.
* Inform patients that diarrhea can be a common side effect, but persistent, watery, or bloody stools require immediate medical consultation.
* Treatment duration varies by indication (typically 5–14 days); follow local antibiogram data for susceptibility trends in your region regarding gonorrhea.
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**Educational Disclaimer:** This information is for educational purposes only. Prescribing information, local susceptibility patterns, and institutional guidelines must be verified with current clinical resources (e.g., FDA labels, UpToDate, or local infectious disease protocols) before administration.
