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# Genixim (Cefixime)
## Overview
Genixim is a third-generation oral cephalosporin antibiotic. It possesses broad-spectrum activity against Gram-negative bacteria (including *Haemophilus influenzae*, *Moraxella catarrhalis*, and *Neisseria gonorrhoeae*) and limited activity against Gram-positive organisms.
## 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/Pharyngitis:** 400 mg daily (as a single dose or 200 mg every 12 hours).
* **Uncomplicated Gonorrhea:** 800 mg as a single oral dose (Note: Adhere to local guidelines; dual therapy may be required).
## Pediatric Dosing
* **General Infections (children >6 months):** 8 mg/kg/day administered as a single daily dose or in two divided doses (4 mg/kg every 12 hours).
* **Max Pediatric Dose:** 400 mg/day.
## Dose Adjustments
* **Renal Impairment:** If CrCl <60 mL/min or patient on hemodialysis, dose reduction is required.
* CrCl 21–60 mL/min: Reduce dose by 25% (or 75% of standard dose).
* CrCl <20 mL/min: Reduce dose by 50% (or 50% of standard dose).
* **Hepatic Impairment:** No formal dosage adjustment established.
## Contraindications
* Known hypersensitivity to cefixime or other cephalosporin antibiotics.
* History of severe allergic reaction (e.g., anaphylaxis) to penicillins or other beta-lactams (due to potential cross-reactivity).
## Adverse Effects
* **Gastrointestinal:** Diarrhea (common), nausea, abdominal pain, dyspepsia.
* **Hepatic/Hematologic:** Transient elevation of liver enzymes (ALT/AST), eosinophilia, leukopenia.
* **Dermatologic:** Rash, pruritus.
* **Severe:** *Clostridioides difficile*-associated diarrhea (CDAD), hypersensitivity reactions.
## Key Drug Interactions
* **Warfarin:** May enhance the anticoagulant effect; monitor INR closely.
* **Probenecid:** Increases serum concentrations of cefixime by inhibiting renal excretion.
* **Carbamazepine:** May increase serum levels of carbamazepine.
## Monitoring
* Monitor for signs of hypersensitivity or anaphylaxis during the first dose.
* Assess renal function (CrCl) at baseline, especially in elderly or patients with pre-existing impairment.
* Monitor for persistent diarrhea; discontinue if CDAD is suspected.
## Clinical Pearls
* **Bioavailability:** Suspension has higher bioavailability than tablets; they are not strictly bioequivalent milligram-for-milligram in all clinical studies.
* **Administration:** Tablets or suspension can be taken with or without food.
* **Spectrum:** Does *not* provide adequate coverage for *Staphylococcus aureus* or *Pseudomonas aeruginosa*.
* **Compliance:** Once-daily dosing is often preferred to improve adherence, though GI side effects are sometimes better managed with split dosing.
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*Disclaimer: This information is for educational purposes only. Dosing, contraindications, and local susceptibility patterns vary by region. Always consult current clinical practice guidelines, local formulary, and the manufacturer’s package insert before prescribing or administering medication.*
