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Antibiotic Dosing in CKD Pregnancy: Use with caution — potential ototoxicity and nephrotoxicity to fetus; use only when clearly indicated with TDM

Vancomycin (Renal Dosing)

Brand names: Vancocin

Adult dose

Dose: Loading dose: 25-30 mg/kg IV (usual 1-2 g). Maintenance: dose and interval adjusted by AUC-guided TDM — target AUC/MIC 400-600 mg/h/L. Conventional trough-guided: target trough 10-20 mg/L (MRSA: 15-20 mg/L).
Route: Intravenous infusion over minimum 60 minutes (rate <10 mg/min to prevent Red Man Syndrome)
Frequency: Every 12-24-48-72 hours depending on eGFR
Max: Per TDM — dose-cap by toxicity, not fixed maximum
Glycopeptide antibiotic for MRSA and serious Gram-positive infections. Primarily renally cleared — profound dose accumulation in CKD. AUC/MIC-guided dosing (not trough alone) now preferred per 2020 ASHP/IDSA/SIDP guideline.

Paediatric dose

Dose: 15 mg/kg
Route: IV infusion
Frequency: Every 6 hours (normal renal function); adjust for renal impairment
Max: Per TDM
Neonates: 10-15 mg/kg every 6-24 hours depending on gestational age and postnatal age — TDM essential. BNFc for specific neonatal/paediatric dosing.

Dose adjustments

Renal

Dose and/or interval must be extended based on eGFR. eGFR 10-50: every 24-72 hours. eGFR <10 or haemodialysis: every 48-96 hours or dose after each session (vancomycin partially removed by haemodialysis — check local protocol). AUC/MIC TDM mandatory in CKD.

Hepatic

No hepatic dose adjustment required — not hepatically metabolised

Paediatric weight-based calculator

Neonates: 10-15 mg/kg every 6-24 hours depending on gestational age and postnatal age — TDM essential. BNFc for specific neonatal/paediatric dosing.

Clinical pearls

  • AUC/MIC-guided dosing (2020 ASHP/IDSA guideline): target AUC 400-600 mg/h/L. Two-point sampling (C1 at 1h post-infusion, C2 as trough) allows AUC calculation via Bayesian software. Superior to trough-only monitoring for efficacy and safety.
  • Red Man Syndrome: NOT an allergic reaction — histamine release from mast cells caused by rapid infusion. Management: slow infusion rate, pre-treat with chlorphenamine. Does NOT preclude future vancomycin use (unlike true allergy). Distinguish from true anaphylaxis.
  • Haemodialysis: standard haemodialysis removes ~50% of vancomycin per session with high-flux membranes. Post-dialysis supplemental dose typically required. Trough before next session guides redosing — aim trough >10 mg/L for most indications.
  • Ototoxicity risk: target troughs >20 mg/L or prolonged exposure increases ototoxicity. Baseline audiometry in patients expected on prolonged courses.
  • CVVH/CVVHDF: vancomycin is highly cleared by continuous renal replacement therapy — typically requires doses every 24-48 hours with TDM guidance. Consult pharmacy.

Contraindications

  • Hypersensitivity to vancomycin
  • Known rapid infusion reactions without pre-treatment

Side effects

  • Red Man Syndrome (histamine-mediated flushing, erythema, hypotension — infuse slowly; premedicate with antihistamine for high-risk patients)
  • Nephrotoxicity (especially combined with aminoglycosides or NSAIDs)
  • Ototoxicity (tinnitus, hearing loss — especially high trough levels or prolonged treatment)
  • Thrombophlebitis (peripheral IV site)
  • Neutropenia (prolonged courses)

Interactions

  • Aminoglycosides (gentamicin, tobramycin) — additive nephrotoxicity and ototoxicity; avoid combination unless essential; TDM mandatory for both
  • Loop diuretics (furosemide) — additive ototoxicity
  • NSAIDs — additive nephrotoxicity
  • Neuromuscular blocking agents — enhanced blockade

Monitoring

  • AUC/MIC or trough levels (first trough before 4th dose with standard dosing)
  • Serum creatinine/eGFR every 48-72 hours
  • Full blood count (neutropenia risk on prolonged courses)
  • Audiology (prolonged therapy)
  • Signs of Red Man Syndrome during infusion

Reference: BNFc; BNF 90; BNFc; 2020 ASHP/IDSA/SIDP Vancomycin Consensus Guidelines; NICE NG15 (Antimicrobial Stewardship); SPC Vancocin. Verify against your local formulary and the latest BNF before prescribing.

Related

Curated clinical cross-links plus same-class fallbacks.

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