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# Ingenixim (Cefixime)
## Overview
Ingenixim is the brand name for **Cefixime**, a third-generation oral cephalosporin antibiotic. It exhibits bactericidal activity by inhibiting bacterial cell wall synthesis via binding to penicillin-binding proteins (PBPs). It has significant activity against Gram-negative organisms (*Haemophilus influenzae*, *Moraxella catarrhalis*, *Neisseria gonorrhoeae*) but limited activity against *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
* **General Infections:** 400 mg orally once daily or 200 mg every 12 hours.
* **Uncomplicated Gonorrhea:** 800 mg orally as a single dose (often combined with other agents per CDC guidelines for empiric coverage).
## Pediatric Dosing
* **General Infections (> 6 months):** 8 mg/kg/day orally as a single dose or in two divided doses (4 mg/kg every 12 hours).
* **Maximum Dose:** 400 mg/day.
## Dose Adjustments
* **Renal Impairment:**
* CrCl 21–60 mL/min: Reduce dose to 75% of the standard dose.
* CrCl < 20 mL/min: Reduce dose to 50% of the standard dose.
* **Hepatic Impairment:** No specific guidance available; use caution.
## Contraindications
* Known hypersensitivity to cefixime or other cephalosporins.
* History of severe allergic reactions (anaphylaxis/urticaria) to penicillins (due to the potential for cross-reactivity).
## Adverse Effects
* **Common:** Diarrhea (often dose-related), abdominal pain, nausea, dyspepsia.
* **Serious:** *Clostridioides difficile*-associated diarrhea, hypersensitivity reactions (anaphylaxis, Stevens-Johnson syndrome), seizures (rare, mostly in patients with renal impairment).
## Key Drug Interactions
* **Warfarin:** May enhance the anticoagulant effect by altering the gut flora (vitamin K synthesis). Monitor INR.
* **Probenecid:** May increase serum concentrations of cefixime by decreasing renal tubular secretion.
## Monitoring
* Monitor for signs of hypersensitivity reactions during initial doses.
* Assess resolution of infection symptoms.
* In prolonged therapy (> 2 weeks), monitor renal and hepatic function.
## Clinical Pearls
* **Administration:** May be taken with or without food. Bioavailability of the suspension is higher than the tablet; they are not strictly bioequivalent on a mg-per-mg basis in all formulations.
* **Formulation Warning:** Oral suspension should not be used as a substitute for tablets in adults due to potential bioavailability differences.
* **Spectrum:** Note that Cefixime has poor activity against *Enterococcus* species and methicillin-resistant *S. aureus* (MRSA).
* **Local Protocols:** Gonorrhea treatment regimens change frequently based on local resistance patterns; always cross-reference the most recent CDC or local public health STI treatment guidelines.
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*Educational Disclaimer: This information is for educational purposes only and does not constitute medical advice. Verify all dosages, contraindications, and drug interactions against current institutional protocols, manufacturer prescribing information, and approved drug databases before prescribing or administering medication.*
