Mexicef

# Mexicef ## Overview - **Classification**: Third-generation Cephalosporin Antibiotic - **Mechanism**: Inhibits bacterial cell wall synthesis by binding to penicillin-binding proteins (PBPs), leading to bacterial cell lysis and death. ## Primary Indications 1. **Severe Bacterial Infections**: Sepsis, hospital-acquired pneumonia, skin and soft tissue infections. 2. **Meningitis**: Bacterial meningitis caused by susceptible organisms. 3. **Complicated Urinary Tract Infections (UTIs)**: Including pyelonephritis. 4. **Gonorrhea**: Uncomplicated and disseminated gonococcal infections. ## Adult Dosing ### Standard Dosing **Most Infections (e.g., CAP, Complicated UTI, SSTI)** - **Dose**: **1-2 grams** - **Frequency**: Once daily (q24h) - **Route**: Intravenous (IV) or Intramuscular (IM) - **Duration**: Typically 7-14 days, depending on infection severity **Bacterial Meningitis / Severe Infections** - **Dose**: **2 grams** - **Frequency**: Every 12-24 hours (q12-24h) - **Route**: Intravenous (IV) - **Maximum**: **4 grams per day** **Uncomplicated Gonorrhea** - **Dose**: **500 mg** (single dose) - **Frequency**: Once - **Route**: Intramuscular (IM) ### Dose Adjustments - **Renal Impairment**: No routine dose adjustment generally needed for CrCl >10 mL/min. - CrCl ≤10 mL/min or ESRD: Consider max **2 grams daily**. Monitor for adverse effects. - **Hepatic Impairment**: No specific dose adjustment. Use with caution in severe hepatic dysfunction. - **Elderly Patients**: No specific dose adjustment. Monitor renal function and overall tolerability. ## Pediatric Dosing ### Neonates (0-28 days) - **Dose**: **50 mg/kg** - **Frequency**: Once daily (q24h) - **Maximum**: **50 mg/kg per dose** - **Special Notes**: **Contraindicated in hyperbilirubinemic neonates and with IV calcium.** Due to risk of ceftriaxone-calcium precipitation in lungs/kidneys. ### Infants (1-12 months) - **Dose**: **50-75 mg/kg** - **Frequency**: Once daily (q24h) - **Maximum**: **2 grams per day** ### Children (1-12 years) - **Dose**: **50-75 mg/kg** - **Frequency**: Once daily (q24h) - **Maximum**: **2 grams per day** (up to **4 grams** for meningitis) ### Adolescents (13-18 years) - **Dose**: Use adult dosing guidelines. - **Maximum**: **4 grams per day** ## Safety Information ### Contraindications - **Absolute**: Known severe hypersensitivity to Mexicef or other cephalosporins. - **Absolute**: Previous immediate and severe hypersensitivity reaction to penicillin (e.g., anaphylaxis). - **Absolute**: **Neonates (0-28 days) with hyperbilirubinemia, especially if premature.** - **Absolute**: Concomitant intravenous calcium-containing solutions in neonates (0-28 days). ### Common Adverse Effects - **Very Common (>10%)**: Injection site pain (IM). - **Common (1-10%)**: Diarrhea, rash, elevated liver enzymes, eosinophilia. - **Serious but Rare**: *Clostridioides difficile* infection (CDI), Stevens-Johnson syndrome (SJS), toxic epidermal necrolysis (TEN), hemolytic anemia, anaphylaxis, biliary pseudolithiasis (sludge/stones). ### Key Drug Interactions - **Calcium-containing Solutions**: **Do NOT administer concurrently with IV Mexicef, especially in neonates.** Fatal precipitation risk. Flush lines between doses if necessary for older patients. - **Oral Anticoagulants (e.g., Warfarin)**: May enhance anticoagulant effect. Monitor INR closely. - **Live Typhoid Vaccine**: May decrease vaccine effectiveness. Administer vaccine at least 24 hours after last Mexicef dose. - **Loop Diuretics (e.g., Furosemide)**: Increased risk of nephrotoxicity. Monitor renal function. ## Monitoring & Follow-up - **Before Treatment**: Obtain culture & sensitivity, renal function (BUN/Cr), liver function tests (LFTs) if baseline concerns. - **During Treatment**: Monitor for clinical improvement. - **Daily**: Assess for new rash, diarrhea, injection site reactions. - **Periodically**: Renal function (especially with prolonged therapy or comorbidities), LFTs. - **Clinical Signs**: Watch for signs of superinfection (e.g., oral/vaginal candidiasis, C. diff diarrhea), allergic reactions, or worsening infection. ## Clinical Pearls - 💡 **Once Daily Dosing**: Mexicef's long half-life allows for convenient once-daily dosing for most indications, improving adherence. - 💡 **IM Administration**: IM injection can be painful; dilute with lidocaine 1% for deep IM injection if appropriate. - 💡 **Calcium Precaution**: Always remember the critical interaction with calcium, especially in neonates. Flush lines thoroughly if sequential administration is unavoidable in older patients. - 💡 **Biliary Sludge**: Can occur, especially with high doses or prolonged use. Usually asymptomatic but can mimic gallstones. Resolves upon discontinuation. > **⚠️ Important**: This information is for educational purposes only. Always consult current prescribing information, local guidelines, and clinical judgment before prescribing.