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Related Experiment Video

Updated: Aug 15, 2025

Multi-scale Analysis of Bacterial Growth Under Stress Treatments

Multi-scale Analysis of Bacterial Growth Under Stress Treatments

Published on: November 28, 2019

High-dose cephalexin for cellulitis: a pilot randomized controlled trial.

Krishan Yadav^1,2,3,4, Debra Eagles^5,6,7, Jeffrey J Perry^5,6,7

¹Department of Emergency Medicine, University of Ottawa, Ottawa, ON, Canada. kyadav@toh.ca.

|January 2, 2023

Summary

This summary is machine-generated.

High-dose cephalexin showed fewer treatment failures for skin infections in a pilot study. This randomized trial suggests a larger study is feasible, with high-dose treatment potentially improving outcomes for cellulitis patients.

Keywords:

Cellulitis Cephalexin Oral antibiotics Treatment failure

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Last Updated: Aug 15, 2025

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Published on: December 10, 2016

Area of Science:

Infectious Diseases
Dermatology
Clinical Trials

Background:

Skin and soft tissue infections, including non-purulent cellulitis, account for up to 3% of Emergency Department (ED) visits.
Current treatment failure rates for cellulitis approach 20%, with limited evidence on optimal outpatient management.
Investigating alternative antibiotic dosing strategies is crucial for improving patient outcomes.

Purpose of the Study:

To assess the feasibility of a randomized controlled trial comparing high-dose (1000 mg) versus standard-dose (500 mg) cephalexin.
To evaluate the efficacy of different cephalexin dosages in treating Emergency Department patients diagnosed with cellulitis.
To determine participant recruitment rates and preliminary treatment failure data for future large-scale trials.

Main Methods:

A double-blind, randomized controlled pilot trial was conducted in two Canadian EDs.
Adult patients with non-purulent cellulitis eligible for outpatient oral antibiotic management were randomized.
Participants received either high-dose or standard-dose cephalexin four times daily for 7 days; primary feasibility outcome was recruitment rate (target ≥35%).

Main Results:

A recruitment rate of 51.5% was achieved, exceeding the target, indicating trial feasibility.
Treatment failure occurred in 12.9% of the standard-dose group versus 3.2% in the high-dose group.
The high-dose arm experienced more minor adverse events, but no unplanned hospitalizations occurred within 14 days.

Conclusions:

This pilot trial successfully demonstrated the feasibility of a larger randomized controlled trial comparing high-dose versus standard-dose cephalexin for cellulitis.
High-dose cephalexin showed a trend towards fewer treatment failures, though associated with more minor adverse effects.
Findings will inform the design of a definitive, large-scale trial to establish optimal cephalexin dosing for cellulitis.