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# Genixim (Cefixime)
## Overview
Genixim is a third-generation cephalosporin antibiotic. It is acid-stable and exhibits bactericidal activity by inhibiting bacterial cell wall synthesis. It is highly active against many Gram-negative organisms, including *Neisseria gonorrhoeae*, *Haemophilus influenzae*, and *Moraxella catarrhalis*, but has limited activity against Gram-positive organisms (e.g., *Staphylococcus aureus*).
## Primary Indications
* Uncomplicated urinary tract infections (UTIs)
* Otitis media
* Pharyngitis and tonsillitis
* Acute bronchitis and acute exacerbations of chronic bronchitis
* Uncomplicated gonorrhea (cervical/urethral/rectal)
## Adult Dosing
* **Respiratory/UTI/General Infections:** 400 mg once daily or 200 mg every 12 hours.
* **Uncomplicated Gonorrhea:** 800 mg orally as a single dose.
* **Maximum Dose:** 400 mg per dose for general infections; 800 mg for gonorrhea.
## Pediatric Dosing
(Typically > 6 months of age)
* **Standard Infections:** 8 mg/kg/day orally, either as a single daily dose or divided into two doses (4 mg/kg every 12 hours).
* **Maximum Pediatric Dose:** 400 mg per day.
## Dose Adjustments
* **Renal Impairment:**
* CrCl 21–60 mL/min: Reduce dose by 25% (or 75% of standard dose).
* CrCl < 20 mL/min (or hemodialysis): Reduce dose by 50% (or 50% of standard dose).
* Cefixime is not significantly removed by hemodialysis.
* **Hepatic Impairment:** No specific dosage adjustments needed.
## Contraindications
* Known hypersensitivity to cefixime or other cephalosporins (e.g., cephalexin, ceftriaxone).
* History of severe allergic reactions (e.g., anaphylaxis, Stevens-Johnson syndrome) to penicillins or other beta-lactams.
## Adverse Effects
* **Common:** Diarrhea (frequently dose-related), 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
* **Warfarin:** May increase the anticoagulant effect (monitor INR).
* **Probenecid:** Increases serum concentrations of cefixime by reducing renal tubular secretion.
* **Carbamazepine:** Serum levels of carbamazepine may be elevated in rare instances.
## Monitoring
* Monitor for signs of hypersensitivity reactions.
* In prolonged therapy, assess renal, hepatic, and hematologic functions.
* Observe for persistent diarrhea; test for *C. difficile* if severe diarrhea occurs.
## Clinical Pearls
* **Bioavailability:** Suspension has higher bioavailability than tablets; if switching between formulations, monitor dose carefully.
* **Food:** Can be taken with or without food.
* **Cross-reactivity:** Cautious use is recommended in patients with a history of penicillin allergy; avoid if the previous reaction was IgE-mediated (e.g., anaphylaxis, angioedema).
* **Local Protocols:** Treatment of gonorrhea currently requires dual therapy (e.g., ceftriaxone plus azithromycin or doxycycline) per many local guidelines; verify specific local STI management protocols before using cefixime monotherapy.
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*Disclaimer: This information is for educational purposes only and does not constitute medical advice. Always refer to the latest institutional guidelines, the FDA-approved package insert, or professional pharmacological references for current dosing, contraindications, and drug interaction data before prescribing or administering medication.*
