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# Zegenixim (Cefixime)
## Overview
Zegenixim is a third-generation, oral cephalosporin antibiotic. It possesses broad-spectrum activity against Gram-negative bacteria (e.g., *Haemophilus influenzae*, *Moraxella catarrhalis*, *Neisseria gonorrhoeae*) and some Gram-positive activity, though it is generally less effective against *Staphylococcus aureus* than earlier-generation cephalosporins.
## 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
* **Uncomplicated Gonorrhea:** 800 mg orally as a single dose.
* **Respiratory/UTI Infections:** 400 mg daily, administered either as a single dose or in two divided doses (200 mg every 12 hours).
* **Maximum Dose:** 400 mg per 24 hours for non-gonococcal infections.
## Pediatric Dosing
* **Patients >6 months (weighing <50 kg):** 8 mg/kg/day orally, administered as a single dose or in two divided doses (4 mg/kg every 12 hours).
* **Patients >50 kg or >12 years:** Use adult dosing.
* **Note:** Dosing for specific infections may vary by local institutional protocol; always verify weight-based calculations.
## Dose Adjustments
* **Renal Impairment:**
* CrCl 21–60 mL/min: Administer 75% of the standard dose.
* CrCl <20 mL/min or hemodialysis: Administer 50% of the standard dose.
* **Hepatic Impairment:** No specific adjustment required.
## Contraindications
* Known hypersensitivity to cefixime or other cephalosporin antibiotics.
* History of severe allergic reactions (e.g., anaphylaxis) to penicillins or other beta-lactam antibiotics (due to potential cross-reactivity).
## Adverse Effects
* **Common:** Diarrhea (frequently dose-related), abdominal pain, nausea, dyspepsia.
* **Serious:** *Clostridioides difficile*-associated diarrhea (CDAD), hypersensitivity reactions (rash, pruritus, urticaria), seizures (rare, primarily in renally impaired patients receiving excessive doses).
## Key Drug Interactions
* **Anticoagulants:** May enhance the effects of warfarin (monitor INR).
* **Probenecid:** Increases serum concentrations of cefixime by inhibiting renal tubular secretion.
* **Contraceptives:** Theoretical reduction in efficacy of estrogen-containing oral contraceptives (counsel on backup barrier method).
## Monitoring
* **Renal Function:** Periodic monitoring of CrCl in patients with pre-existing impairment.
* **GI Symptoms:** Monitor for persistent diarrhea; test for *C. difficile* if severe or persistent.
* **Hypersensitivity:** Monitor for signs of skin rashes or anaphylaxis, especially during the initial doses.
## Clinical Pearls
* **Bioavailability:** Suspension has higher bioavailability than tablets; confirm the formulation before calculating doses.
* **Dosing Timing:** May be administered with or without food.
* **Spectrum Limitations:** Cefixime has poor activity against *Staphylococcus* species and *Enterococcus* species. It remains the preferred oral agent for uncomplicated gonorrhea per CDC guidelines when Ceftriaxone injection is not feasible.
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**Educational Disclaimer:** This information is for educational purposes only and does not constitute medical advice. Prescribing information, local susceptibility patterns, and clinical guidelines change frequently. Always verify the most current dosing, indications, and safety information via official package inserts, institutional formulary databases (e.g., Lexicomp, Micromedex), or current clinical guidelines before prescribing or administering medication.
