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# Tabgenixim (Cefixime)
## Overview
Tabgenixim is a brand name for **Cefixime**, a third-generation oral cephalosporin. It functions by inhibiting bacterial cell wall synthesis through binding to penicillin-binding proteins (PBPs), leading to cell lysis. It exhibits broad-spectrum activity against many Gram-negative organisms but limited activity against Gram-positive cocci (e.g., *Staphylococcus aureus*).
## Primary Indications
* Uncomplicated urinary tract infections (UTIs) caused by susceptible *E. coli, P. mirabilis*.
* Otitis media.
* Pharyngitis and tonsillitis (*S. pyogenes*).
* Uncomplicated gonorrhea (cervical, urethral, and rectal).
* Acute bronchitis or acute exacerbations of chronic bronchitis.
## Adult Dosing
* **General infections:** 400 mg daily, administered either as a single dose or in two divided doses of 200 mg every 12 hours.
* **Uncomplicated Gonorrhea:** 400 mg as a single oral dose.
* *Note:* Maximum daily dose is 400 mg.
## Pediatric Dosing
* **Children ≥ 6 months:** 8 mg/kg/day orally, administered as a single daily dose or in two divided doses of 4 mg/kg every 12 hours.
* **Children > 50 kg or > 12 years:** Use adult dosing (400 mg/day).
## Dose Adjustments
* **Renal Impairment:** If CrCl is 21–60 mL/min, reduce dose to 75% of the standard dose. If CrCl < 20 mL/min, reduce dose to 50% of the standard dose.
* **Hepatic Impairment:** No specific data available; generally considered safe, but monitor for severity.
## Contraindications
* Known hypersensitivity to cefixime or other cephalosporin antibiotics.
* History of severe allergic reactions (e.g., anaphylaxis) to penicillins or other beta-lactams (due to potential cross-reactivity).
## Adverse Effects
* **Common:** Diarrhea (often dose-related), abdominal pain, nausea, dyspepsia.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (rash, urticaria), seizures (rare, high-dose), and blood dyscrasias (agranulocytosis, neutropenia).
## Key Drug Interactions
* **Warfarin:** May enhance the anticoagulant effect of vitamin K antagonists; monitor INR.
* **Probenecid:** May increase serum levels of cefixime by inhibiting renal excretion.
* **Contraceptives:** May theoretically decrease the efficacy of oral contraceptives by altering gut flora, though evidence is inconsistent; suggest backup barrier methods during therapy.
## Monitoring
* Monitor for signs of hypersensitivity or anaphylaxis during first dose.
* Assess for persistent diarrhea (potential *C. difficile* infection).
* Periodic renal function assessment in patients on long-term therapy or with baseline impairment.
## Clinical Pearls
* **Food effect:** Can be taken with or without food. Oral suspension is generally formulated to be more bioavailable than tablets; bioequivalence should not be assumed between different proprietary formulations.
* **Antibiotic Stewardship:** Avoid use in viral pharyngitis.
* **Gonorrhea:** Due to emerging resistance, local susceptibility patterns should be consulted; often used in conjunction with other agents (e.g., azithromycin) depending on local guidelines.
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**Educational Disclaimer:** This information is for educational purposes only and does not constitute medical advice. Dosing, contraindications, and drug interactions change frequently. Always consult the most current prescribing information (package insert) or institutional protocols before prescribing or administering any medication.
