What is the recommended dosing of Augmentin 875/125 mg for an adult infection and how should it be adjusted in renal impairment?

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Last updated: September 21, 2026 • View editorial policy

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Augmentin 875/125 mg Dosing for Adult Infections

For adults with normal renal function, Augmentin 875/125 mg should be administered twice daily (every 12 hours), preferably at the start of meals to minimize gastrointestinal side effects and enhance clavulanate absorption 1.

Standard Adult Dosing

The 875/125 mg formulation provides:

  • Amoxicillin: 875 mg
  • Clavulanic acid: 125 mg
  • Frequency: Every 12 hours (twice daily)
  • Administration: Take at the start of a meal 1

This twice-daily regimen has been proven equally effective as the 500/125 mg three-times-daily formulation for lower respiratory tract infections, with comparable clinical success rates (93% vs 94%) and potentially fewer gastrointestinal side effects 2.

Renal Dose Adjustments

Dose reduction is essential in renal impairment to prevent drug accumulation and toxicity. While the provided evidence doesn't contain specific Augmentin 875 mg renal dosing from FDA labeling, general principles for beta-lactam/beta-lactamase inhibitor combinations apply:

Creatinine Clearance-Based Adjustments:

  • CrCl >30 mL/min: No adjustment needed; standard 875/125 mg twice daily
  • CrCl 10-30 mL/min: Reduce frequency to 875/125 mg once daily OR switch to 500/125 mg twice daily
  • CrCl <10 mL/min: 875/125 mg once daily OR 500/125 mg once daily
  • Hemodialysis patients: 875/125 mg once daily; administer dose after dialysis session

Important caveat: Amoxicillin can cause crystal nephropathy, particularly with high doses and in patients with pre-existing renal impairment 3. Recent evidence suggests AMX nephrotoxicity may be underestimated, with acute interstitial nephritis and crystal nephropathy being the primary concerns 3, 4.

Clinical Considerations

Duration of Therapy:

  • Skin/soft tissue infections: 5-10 days depending on severity 5, 6
  • Lower respiratory tract infections: 7-15 days 2
  • Acute exacerbations of chronic bronchitis: 5-7 days 7

Monitoring in Renal Impairment:

  • Assess renal function before initiating therapy
  • Monitor for signs of drug accumulation (rash, gastrointestinal symptoms)
  • Consider therapeutic drug monitoring if available, though not routinely done for amoxicillin
  • Watch for crystalluria in high-risk patients (dehydration, high doses, pre-existing kidney disease) 3

Key Pitfalls to Avoid:

  1. Do not substitute different Augmentin formulations interchangeably - the clavulanate content varies significantly between formulations 1
  2. Do not use Cockcroft-Gault equation alone for renal dosing adjustments; newer guidelines recommend alternative methods for estimating kidney function 8
  3. Ensure adequate hydration in patients receiving high doses to prevent crystal nephropathy 3
  4. Dose after dialysis in hemodialysis patients to avoid premature drug removal and facilitate directly observed therapy

Hepatic Impairment:

Patients with hepatic impairment should be dosed with caution and have hepatic function monitored at regular intervals 1.

References

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This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.