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# Genixim (Cefixime)
## Overview
Genixim is the brand name for **cefixime**, a third-generation oral cephalosporin. It possesses broad-spectrum activity against many Gram-negative bacteria, including *Haemophilus influenzae*, *Moraxella catarrhalis*, and *Neisseria gonorrhoeae*, but has limited activity against Gram-positive organisms (e.g., *Staphylococcus aureus*).
## Primary Indications
* Uncomplicated gonorrhea (cervical, urethral, rectal).
* Otitis media (in patients where oral therapy is appropriate).
* Pharyngitis and tonsillitis.
* Acute bronchitis and acute exacerbations of chronic bronchitis.
* Uncomplicated urinary tract infections (UTIs).
## Adult Dosing
* **Gonorrhea:** 800 mg orally as a single dose.
* **General bacterial infections (e.g., pharyngitis, UTI, bronchitis):** 400 mg daily, administered either as a single dose or divided into 200 mg every 12 hours.
* **Maximum:** 400 mg per day.
## Pediatric Dosing
* **General infections (Children > 6 months / > 50 kg):** Administer adult dosing (400 mg daily).
* **General infections (< 50 kg):** 8 mg/kg/day orally, either as a single dose or divided into 4 mg/kg every 12 hours.
* **Maximum:** 400 mg per day.
## Dose Adjustments
* **Renal Impairment:** If creatinine clearance (CrCl) is 21–60 mL/min, reduce dose to 75% of the standard dose. If CrCl < 20 mL/min, reduce to 50% of the standard dose.
* *Note:* Cefixime is not significantly removed by hemodialysis or peritoneal dialysis.
## 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 (frequently dose-related), nausea, abdominal pain, and dyspepsia.
* **Serious:** *Clostridioides difficile*-associated diarrhea (CDAD), severe hypersensitivity reactions (Stevens-Johnson syndrome, angioedema), and transient increases in liver enzymes.
## Key Drug Interactions
* **Warfarin:** May increase the anticoagulant effect (monitor INR).
* **Probenecid:** Inhibits renal excretion of cefixime, significantly increasing serum concentrations and half-life.
* **Vaccines:** Avoid co-administration with live-attenuated typhoid vaccine (efficacy may be reduced).
## Monitoring
* Monitor for signs of hypersensitivity (rash, urticaria).
* Monitor for persistent diarrhea (rule out *C. difficile*).
* In prolonged therapy, perform periodic liver and renal function tests.
## Clinical Pearls
* **Absorption:** Bioavailability is not significantly affected by food intake.
* **Spectrum:** It is inferior to penicillins for *Streptococcus pneumoniae* and inferior to cephalexin for MSSA. It should not be used as monotherapy for pneumonia.
* **Adherence:** Suspension stability is typically 14 days at room temperature; advise patients to discard any unused portion after this period.
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**Educational Disclaimer:** This information is for educational purposes only. Clinical practice guidelines vary by region and institutional protocols. Always verify current prescribing information, dosage calculations, and patient-specific contraindications via official drug monographs (e.g., Lexicomp, Micromedex, or the BNF) before prescribing or administering medication.
