Categorize renal function from creatinine clearance (CrCl) and provide FDA/KDIGO-aligned dosing guidance: Normal (CrCl ≥60) → standard dosing; Mild (30–59) → consider dose reduction or interval extension; Moderate (15–29) → reduction and/or extension typically required; Severe (<15) → significant reduction, many drugs contraindicated or post-dialysis only. Outlines two adjustment strategies: (A) interval extension for concentration-dependent drugs (aminoglycosides, vancomycin), (B) dose reduction for time-dependent drugs (β-lactams). Dialysis toggle flags the need for post-dialysis supplementation per the specific drug label. Derived from FDA Pharmacokinetics Guidance, the KDIGO Drug Dosing Consensus, and NIDDK guidance. This tool does NOT replace the FDA-approved package insert for any specific drug. Not medical advice.
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Tool usage guide
Learn when to use this tool, what it supports, and how real users apply it.
Key facts
Category
Health
Input types
number, checkbox
Output type
json
Sample coverage
4
API ready
Yes
Overview
The Renal Drug Dose Adjustment Helper categorizes renal function from creatinine clearance (CrCl) and provides general FDA/KDIGO-aligned guidance on standard dosing, dose reduction, interval extension, and dialysis-related supplementation. It is a reference aid, not a substitute for the FDA-approved package insert or medical advice.
When to use
Classify renal function using a known creatinine clearance value in mL/min.
Review whether dose reduction or interval extension may be relevant for a renally cleared medicine.
Flag dialysis cases that may require post-dialysis supplementation according to the specific drug label.
How it works
1Enter the estimated creatinine clearance (CrCl) in mL/min; the value must be at least 0.
2The tool assigns a renal function category: normal, mild, moderate, or severe impairment.
3It returns general guidance based on the category, including standard dosing, dose reduction, or interval extension considerations.
4Optionally select dialysis status and choose the number of decimal places for the JSON output.
Use cases
Quickly classify renal impairment when reviewing medication dosing information.
Use CrCl categories to identify when dose reduction or longer dosing intervals may need review.
Support medication safety checks for patients receiving dialysis, alongside the relevant drug labeling.
Examples
1. CrCl 45 mL/min: mild renal impairment
Clinical pharmacist
Background
A pharmacist is reviewing renal dosing considerations for a renally cleared medicine with a narrow therapeutic index.
Problem
The pharmacist needs a concise renal function category and general adjustment guidance before checking the drug-specific label.
How to use
Enter 45 as the CrCl, leave dialysis unchecked, and run the tool.
{"crcl":45,"onDialysis":false,"decimalPlaces":4}
Outcome
The result identifies mild renal impairment, defined as CrCl 30–59 mL/min, and advises considering dose reduction or interval extension.
2. CrCl 12 mL/min with dialysis: severe impairment
Hospital medication reviewer
Background
A medication review involves a patient with CrCl of 12 mL/min who is receiving dialysis.
Problem
The reviewer needs to flag severe renal impairment and remember to verify any post-dialysis supplementation requirement.
How to use
Enter 12 as the CrCl, enable the dialysis option, and check the returned guidance against the specific drug label.
FAQ
What input does the tool require?
Enter an estimated creatinine clearance (CrCl) in mL/min.
How are CrCl values categorized?
Normal is at least 60, mild is 30–59, moderate is 15–29, and severe is below 15 mL/min.
Does the tool calculate a drug-specific dose?
No. It provides general adjustment guidance and does not replace the labeling for a specific drug.
What does the dialysis option do?
It flags that renally cleared drugs may require post-dialysis supplementation according to the specific drug label.
What adjustment strategies are described?
The tool describes interval extension for concentration-dependent drugs and dose reduction for time-dependent drugs.
The result identifies severe renal impairment, notes that significant reduction may be required, and flags post-dialysis supplementation for renally cleared drugs according to the label.