Cefixime Trihidrate

# Cefixime trihidrate ## Overview - **Classification**: Third-generation cephalosporin antibiotic - **Mechanism**: Inhibits bacterial cell wall synthesis by binding to penicillin-binding proteins (PBPs), leading to cell lysis and death. ## Primary Indications 1. **Uncomplicated Urinary Tract Infections (UTIs)** - Caused by susceptible organisms. 2. **Otitis Media** - Acute bacterial otitis media. 3. **Pharyngitis/Tonsillitis** - Streptococcus pyogenes (Group A Strep). 4. **Acute Exacerbation of Chronic Bronchitis** - Due to susceptible organisms. 5. **Uncomplicated Gonorrhea** - Caused by Neisseria gonorrhoeae. ## Adult Dosing ### Standard Dosing **Uncomplicated UTIs, Otitis Media, Pharyngitis/Tonsillitis, Acute Bronchitis** - **Dose**: **400 mg** - **Frequency**: Once daily (QD) - **Route**: Oral - **Duration**: 5-10 days, depending on infection and local guidelines. **Uncomplicated Gonorrhea** - **Dose**: **400 mg** - **Frequency**: Single dose - **Route**: Oral ### Dose Adjustments - **Renal Impairment**: - CrCl 21-60 mL/min: **300 mg** QD. - CrCl ≤ 20 mL/min or on chronic ambulatory peritoneal dialysis (CAPD): **200 mg** QD. - Hemodialysis: **200 mg** QD (monitor carefully). - **Hepatic Impairment**: No specific dose adjustment generally needed. - **Elderly Patients**: Adjust dose based on renal function; no specific age-related adjustment needed if renal function is normal. ## Pediatric Dosing ### Neonates (0-28 days) - **Dose**: Not recommended. - **Special Notes**: Safety and efficacy not established. Risk of hyperbilirubinemia. Avoid use in this age group. ### Infants (1-12 months) - **Dose**: **8 mg/kg/day** - **Frequency**: Once daily (QD) or divided every 12 hours (BID). - **Maximum**: Do not exceed **400 mg/day**. - **Special Notes**: Oral suspension is typically used. ### Children (1-12 years) - **Dose**: **8 mg/kg/day** - **Frequency**: Once daily (QD) or divided every 12 hours (BID). - **Maximum**: Do not exceed **400 mg/day**. - **Special Notes**: Oral suspension or chewable tablets may be appropriate. ### Adolescents (13-18 years) - **Dose**: Typically follows adult dosing, **400 mg** QD. - **Maximum**: **400 mg/day**. ## Safety Information ### Contraindications - **Absolute**: Hypersensitivity to cefixime or any component of the formulation. - **Absolute**: Hypersensitivity to other cephalosporin antibiotics. - **Relative**: History of severe penicillin allergy (anaphylaxis) due to cross-reactivity risk. ### Common Adverse Effects - **Very Common (>10%)**: Diarrhea. - **Common (1-10%)**: Nausea, abdominal pain, dyspepsia, flatulence, headache, dizziness, rash. - **Serious but Rare**: Clostridioides difficile-associated diarrhea (CDAD), severe cutaneous adverse reactions (SCARs), hemolytic anemia, acute kidney injury, seizures. ### Key Drug Interactions - **Oral Anticoagulants (e.g., Warfarin)**: May increase INR and bleeding risk. **Monitor INR closely**, adjust anticoagulant dose as needed. - **Carbamazepine**: May increase carbamazepine levels. **Monitor carbamazepine levels**. - **Oral Contraceptives**: May decrease efficacy. Advise alternative contraception. - **Probenecid**: Increases cefixime concentrations. Use with caution. ## Monitoring & Follow-up - **Before Treatment**: Assess penicillin allergy history. - **During Treatment**: - **Clinical response**: Monitor for improvement in symptoms within 2-3 days. - **Adverse effects**: Watch for diarrhea (CDAD), rash, or signs of allergic reaction. - **Renal function**: Periodically in patients with pre-existing renal impairment or prolonged therapy. - **INR**: For patients on warfarin. - **Clinical Signs**: New onset or worsening diarrhea, severe abdominal pain, skin rash, difficulty breathing. ## Clinical Pearls - 💡 **Tip 1**: Cefixime is a third-gen cephalosporin, often chosen for outpatient treatment of UTIs, otitis media, and some respiratory infections. - 💡 **Tip 2**: Advise patients to complete the full course of antibiotics, even if symptoms improve, to prevent resistance and relapse. - 💡 **Tip 3**: Oral suspension should be shaken well before each use. It can be taken with or without food. - 💡 **Tip 4**: Not effective against Pseudomonas aeruginosa. > **⚠️ Important**: This information is for educational purposes only. Always consult current prescribing information, local guidelines, and clinical judgment before prescribing.