Ceftriaxone

3rd Gen Cephalosporin·Infectious Diseases - Cephalosporins

Meningitis, severe pneumonia, pyelonephritis, gonorrhoea, empiric undifferentiated sepsis

CEPHALOSPORINRocephinAmpoules (1 g, 2 g) for IV o…S4TGA

Max Dose

4 g/day

Half-life

8 h

Biliary Sludge

RISK

Calcium IV

FATAL

Rapid Summary

Overview

Third-generation cephalosporin. Outstanding gram-negative and pneumococcal coverage, incredible CNS penetration, and a long half-life allowing convenient once-daily dosing.

Maximum Dose

Max 4 g/day (strictly for meningitis).

Clinical Focus

NEVER mix Ceftriaxone with IV Calcium (e.g., Hartmann's, TPN) as it forms fatal intravascular crystalline precipitates.

Bottom Line

Ceftriaxone is a powerful third-generation cephalosporin for meningitis, sepsis, and gonorrhoea, but must never be co-administered with calcium-containing IV solutions and can cause biliary sludging.

Formulation & Access

Brand Names

Rocephin

Parenteral

Ampoules (1 g, 2 g) for IV or IM use.

Prescribing & PBS

Hospital supply. Restricted.

Indications & Use

Primary

TGA

Meningitis, severe pneumonia, pyelonephritis, gonorrhoea, empiric undifferentiated sepsis.

Clinical Place

The backbone of ED empiric sepsis pathways. Lacks Pseudomonas and Enterococcus coverage.

Quick reference

Class & Role

3rd Gen Cephalosporin — Third-generation cephalosporin.

Route / Formulation

Ampoules (1 g, 2 g) for IV or IM use. (Rocephin)

Usual Dose & Max

IV 1-2 g OD. Max 4 g/day (strictly for meningitis).

Key Indication Doses

Severe CAP / Pyelonephritis: IV 1-2 g OD. Bacterial Meningitis: IV 2 g BD (Requires massive doses to breach BBB). Gonorrhoea: IM 500 mg STAT (mixed with 1% lidocaine to prevent severe pain). Renal Impairment: Safe to use without dose adjustment in standard CKD (due to dual biliary/renal clearance).

Best Uses

Ceftriaxone is a powerful third-generation cephalosporin for meningitis, sepsis, and gonorrhoea, but must never be co-administered with calcium-containing IV solutions and can cause biliary sludging.

Avoid / Cautions

Neonates ≤ 28 days (Displaces bilirubin from albumin, causing fatal kernicterus, and risks fatal calcium precipitation). Pregnancy Category B1.

Key Risks

Hepatic / Biliary: Biliary sludging and 'pseudolithiasis' (reversible gallstones causing RUQ pain). Gastrointestinal: C. difficile infection (3rd gen cephalosporins are notorious for wiping out gut flora). Immunological: Hypersensitivity. Cross-reacts with severe penicillin allergies (~1-3%).

Key Interactions

IV Calcium solutions (Hartmann's, Plasmalyte). Wait 48 hours or use distinct, deeply flushed lines.

Monitoring

Monitor LFTs for biliary stasis. Monitor FBC (rare hemolytic anemia). Assess for Right Upper Quadrant pain (biliary sludge).

Clinical Pearl

Because Ceftriaxone has dual hepatic and renal clearance, it is one of the very few IV antibiotics that does not require dose reduction in renal failure. Highly useful in acute AKI sepsis.

Access

Rocephin

Brand: Rocephin

Ceftriaxone

3rd Gen Cephalosporin·Infectious Diseases - Cephalosporins

Meningitis, severe pneumonia, pyelonephritis, gonorrhoea, empiric undifferentiated sepsis

CEPHALOSPORINRocephinAmpoules (1 g, 2 g) for IV o…S4TGA

Max Dose

4 g/day

Half-life

8 h

Biliary Sludge

RISK

Calcium IV

FATAL

Rapid Summary

Overview

Third-generation cephalosporin. Outstanding gram-negative and pneumococcal coverage, incredible CNS penetration, and a long half-life allowing convenient once-daily dosing.

Maximum Dose

Max 4 g/day (strictly for meningitis).

Clinical Focus

NEVER mix Ceftriaxone with IV Calcium (e.g., Hartmann's, TPN) as it forms fatal intravascular crystalline precipitates.

Bottom Line

Ceftriaxone is a powerful third-generation cephalosporin for meningitis, sepsis, and gonorrhoea, but must never be co-administered with calcium-containing IV solutions and can cause biliary sludging.

Formulation & Access

Brand Names

Rocephin

Parenteral

Ampoules (1 g, 2 g) for IV or IM use.

Prescribing & PBS

Hospital supply. Restricted.

Indications & Use

Primary

TGA

Meningitis, severe pneumonia, pyelonephritis, gonorrhoea, empiric undifferentiated sepsis.

Clinical Place

The backbone of ED empiric sepsis pathways. Lacks Pseudomonas and Enterococcus coverage.

Quick reference

Class & Role

3rd Gen Cephalosporin — Third-generation cephalosporin.

Route / Formulation

Ampoules (1 g, 2 g) for IV or IM use. (Rocephin)

Usual Dose & Max

IV 1-2 g OD. Max 4 g/day (strictly for meningitis).

Key Indication Doses

Best Uses

Ceftriaxone is a powerful third-generation cephalosporin for meningitis, sepsis, and gonorrhoea, but must never be co-administered with calcium-containing IV solutions and can cause biliary sludging.

Avoid / Cautions

Neonates ≤ 28 days (Displaces bilirubin from albumin, causing fatal kernicterus, and risks fatal calcium precipitation). Pregnancy Category B1.

Key Risks

Key Interactions

IV Calcium solutions (Hartmann's, Plasmalyte). Wait 48 hours or use distinct, deeply flushed lines.

Monitoring

Monitor LFTs for biliary stasis. Monitor FBC (rare hemolytic anemia). Assess for Right Upper Quadrant pain (biliary sludge).

Clinical Pearl

Because Ceftriaxone has dual hepatic and renal clearance, it is one of the very few IV antibiotics that does not require dose reduction in renal failure. Highly useful in acute AKI sepsis.

Access

Rocephin

Brand: Rocephin