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# Ceftriaxone
## Overview
Ceftriaxone is a third-generation cephalosporin antibiotic with broad-spectrum activity against many Gram-positive and Gram-negative bacteria. It achieves high concentrations in various body fluids, including cerebrospinal fluid.
## Primary Indications
* **Meningitis:** Bacterial meningitis (especially *Neisseria meningitidis*, *Haemophilus influenzae* type b, and *Streptococcus pneumoniae*).
* **Pneumonia:** Community-acquired pneumonia, hospital-acquired pneumonia.
* **Skin and Skin Structure Infections:** Uncomplicated and complicated.
* **Urinary Tract Infections:** Including pyelonephritis.
* **Intra-abdominal Infections:** Often in combination with other agents.
* **Sepsis:** Bacterial sepsis.
* **Gonococcal Infections:** Treatment of disseminated gonococcal infections and uncomplicated gonorrhea.
* **Disseminated Lyme Disease:** Particularly neurological or cardiac manifestations.
* **Surgical Prophylaxis:** Prevention of surgical site infections.
## Adult Dosing
* **General Infections:** 1-2 grams IV/IM every 24 hours.
* **Severe Infections:** Up to 4 grams IV/IM divided every 12 hours.
* **Meningitis:** 2 grams IV every 12 hours.
* **Uncomplicated Gonorrhea:** 500 mg IM as a single dose.
* **Disseminated Gonococcal Infection:** 1 gram IV/IM every 24 hours for 7 days.
* **Surgical Prophylaxis:** 1-2 grams IV/IM 30-60 minutes before incision.
Maximum dose: 4 grams per 24 hours.
## Pediatric Dosing
Dosing varies significantly by indication and patient age/weight. **Consult specific pediatric guidelines or institutional protocols.**
* **Meningitis:** 100 mg/kg IV every 24 hours, or 50 mg/kg IV every 12 hours. Maximum 4 grams per 24 hours.
* **Non-meningitis infections:** 50-100 mg/kg IV/IM every 24 hours. Maximum 2 grams per 24 hours.
* **Neonates (< 7 days or weighing < 2000 g):** 25 mg/kg IV every 24 hours.
* **Neonates (7-28 days or weighing > 2000 g):** 50 mg/kg IV every 24 hours.
* **Neonate with Bacterial Meningitis:** 100 mg/kg IV every 24 hours.
## Dose Adjustments
No dose adjustment is typically required for hepatic impairment.
For **renal impairment**, no dose adjustment is generally needed unless concurrent severe hepatic impairment is present.
## Contraindications
* Known hypersensitivity to ceftriaxone, other cephalosporins, or penicillins.
* Concurrent use with intravenous calcium-containing solutions in neonates (risk of fatal precipitate in lungs and kidneys). However, for older children and adults, concurrent administration via separate IV lines or flushing between infusions is generally considered acceptable.
## Adverse Effects
* **Common:** Diarrhea, rash, eosinophilia, thrombocytosis, phlebitis at the injection site.
* **Serious:** Hypersensitivity reactions (including anaphylaxis), *Clostridioides difficile*-associated diarrhea, biliary sludge/pseudolithiasis (especially in neonates and children), hemolytic anemia, interstitial nephritis, neurological effects (rare).
## Key Drug Interactions
* **Aminoglycosides:** Potential for synergistic nephrotoxicity and ototoxicity, though this is debated and may depend on specific cephalosporin and patient factors.
* **Warfarin:** May decrease the effectiveness of warfarin, requiring increased monitoring of INR.
* **Probenecid:** May increase ceftriaxone levels.
* **Calcium-containing solutions:** **Contraindicated in neonates.** Avoid concurrent administration in all patients if possible, or ensure adequate flushing between separate IV lines.
## Monitoring
* **Clinical signs and symptoms of infection.**
* **Renal and hepatic function** in patients with pre-existing impairment or receiving prolonged therapy.
* **Complete blood count** with differential and platelet count, especially with prolonged therapy.
* **INR** if patient is on warfarin.
* **Biliary ultrasound** if symptoms suggestive of biliary sludge or stones develop.
## Clinical Pearls
* Ceftriaxone has a long half-life, allowing for once-daily dosing, which can improve adherence and convenience.
* IV administration is preferred for severe infections and meningitis to ensure adequate CNS penetration. IM administration is acceptable for many indications.
* Reconstituted solutions should generally be used within 24 hours if refrigerated, or follow manufacturer-specific guidelines for room temperature stability.
* Pay close attention to the contraindication regarding calcium-containing solutions in neonates.
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*This information is intended for clinical professionals. Always refer to the most current prescribing information and institutional protocols for complete details before initiating therapy.*
