About This Calculator
The Delafloxacin Dose Calculator is a clinical support tool designed to help healthcare professionals determine the appropriate dosage of delafloxacin (Baxdela®) for adult patients. It calculates the recommended dose based on the specific indication—Acute Bacterial Skin and Skin Structure Infections (ABSSSI) or Community-Acquired Bacterial Pneumonia (CABP)—and the patient's renal function, which can be estimated using the Cockcroft-Gault equation or entered directly.
Outputs Explained
After processing the inputs, the calculator provides a clear dosing recommendation that includes:
- Recommended Dose: The amount of delafloxacin in milligrams (mg) per administration.
- Route & Frequency: Whether the dose should be given Intravenously (IV) or Orally (PO), and the dosing schedule (typically every 12 hours).
- Calculated CrCl: If the Cockcroft-Gault method is used, the tool displays the calculated creatinine clearance in mL/min, which forms the basis for any renal dose adjustments.
- Clinical Rationale: A brief note explaining the reason for the recommended dose, such as standard dosing or adjustment for renal impairment.
How to Use the Calculator
To determine the correct delafloxacin dose, follow these steps:
- Select Indication: Choose either ABSSSI or CABP.
- Select Route: Specify Intravenous (IV) or Oral (PO) administration.
- Enter Renal Function:
- Choose "Calculate CrCl" and enter the patient's age, sex, weight (in kg or lbs), and serum creatinine (in mg/dL or μmol/L).
- Alternatively, choose "Enter CrCl Directly" and input the known value in mL/min.
- Indicate Hemodialysis Status: Check the box if the patient is on maintenance hemodialysis, as this affects dosing for severe renal impairment.
- Calculate: Click the "Calculate Dose" button to view the recommendation.
Dosing Overview
Delafloxacin dosage is adjusted based on creatinine clearance (CrCl). The recommendations are consistent for both ABSSSI and CABP indications.
| Renal Function (CrCl) | Intravenous (IV) Dose | Oral (PO) Dose |
|---|---|---|
| ≥ 30 mL/min | 300 mg every 12 hours | 450 mg every 12 hours |
| 15 to 29 mL/min | 200 mg every 12 hours | 300 mg every 12 hours |
| < 15 mL/min (on HD) | 200 mg every 12 hours | 300 mg every 12 hours |
| < 15 mL/min (not on HD) | Use is not recommended as dosing has not been established. | |
Switching Between IV and Oral Therapy
Patients who are clinically stable may be switched from intravenous to oral therapy. The recommended conversion is from a 300 mg IV dose to a 450 mg oral dose, administered every 12 hours. This switch should be guided by the healthcare provider's clinical judgment.
Missed Dose Information
If a dose of delafloxacin is missed, the patient should take it as soon as they remember. However, if it is almost time for the next scheduled dose, they should skip the missed dose and resume their regular dosing schedule. Patients should be advised not to take two doses at the same time to make up for a missed one.
Safety Alerts
For Educational Use Only: This calculator is intended for educational and informational purposes and should not replace professional medical advice, diagnosis, or treatment.
Consult Prescribing Information: Always refer to the most current official prescribing information for Baxdela® before making any clinical decisions. Dosing recommendations are for adults only; safety and efficacy have not been established in pediatric patients.
Frequently Asked Questions (FAQ)
What is the dose for a patient with a CrCl of 25 mL/min?
For a patient with a CrCl between 15 and 29 mL/min, the dose is adjusted to 200 mg IV or 300 mg PO every 12 hours.
Can I use this calculator for pediatric patients?
No. This tool is designed for adult dosing only. The safety and effectiveness of delafloxacin in patients under 18 years of age have not been established.
How does checking the "Hemodialysis (HD)" box affect the calculation?
For patients with a CrCl below 15 mL/min, checking the HD box provides a specific dose recommendation (200 mg IV or 300 mg PO). If the box is not checked, the tool indicates that a dose has not been established for this population.
Does the indication (ABSSSI vs. CABP) change the calculated dose?
No, the recommended delafloxacin dosage based on renal function is the same for both ABSSSI and CABP.
What is the oral equivalent of a 300 mg IV dose?
The equivalent oral dose for a patient who can be switched from IV therapy is 450 mg every 12 hours, assuming normal renal function.
Why is the standard oral dose (450 mg) higher than the IV dose (300 mg)?
The difference accounts for the drug's bioavailability, ensuring that a similar amount of active medication reaches the bloodstream when administered orally compared to intravenously.
What should I do if my patient's CrCl is 12 mL/min and they are not on dialysis?
The use of delafloxacin is not recommended in patients with a CrCl < 15 mL/min who are not on hemodialysis, as sufficient data to establish a dose are not available.
Does delafloxacin need to be timed with hemodialysis sessions?
No. According to the prescribing information, delafloxacin can be administered to patients on hemodialysis without regard to the timing of the HD session.
References
- BAXDELA® (delafloxacin) Prescribing Information. U.S. Food and Drug Administration. Revised: 10/2019.
- Baxdela (delafloxacin) for Healthcare Professionals. Melinta Therapeutics.
- Pullman J, Gardovskis J, Farley B, et al. Efficacy and safety of delafloxacin compared with vancomycin plus aztreonam for acute bacterial skin and skin structure infections: a Phase 3, multicenter, randomized, double-blind, non-inferiority study. J Antimicrob Chemother. 2017;72(11):3212-3220.
- Horcajada JP, et al. A Phase 3, randomized, double-blind, non-inferiority study of delafloxacin for the treatment of patients with community-acquired bacterial pneumonia (DEFINE-CABP). Chest. 2021;159(3):1078-1088.
I am a Registered Pharmacist under the Pharmacy Act, 1948, and the founder of PharmacyFreak.com. I hold a Bachelor of Pharmacy degree from Rungta College of Pharmaceutical Science and Research. With a strong academic foundation and practical knowledge, I am committed to providing accurate, easy-to-understand content to support pharmacy students and professionals. My aim is to make complex pharmaceutical concepts accessible and useful for real-world application.
Mail- Sachin@pharmacyfreak.com