From:  Bacteriophage therapy in the antibiotic resistance era: mechanistic promise, clinical evidence, and system-level barriers

 Comparative mechanistic and clinical properties of antibiotics vs. bacteriophages.

DimensionAntibioticsBacteriophage therapyClinical implication
Nature of agentSmall-molecule chemicalReplicating biological entityDifferent regulatory and PK frameworks required
Target flexibilityFixed molecular targetsAdaptable receptor targetingResistance dynamics fundamentally differ
Activity requirementActive bacterial metabolismCan act on dormant/biofilm cellsAdvantage in chronic infections
Dose-response predictabilityHighVariable, context-dependentLimits standardization
In vivo amplificationNoneYes (host-dependent)Complicates PK/PD modeling
Resistance trajectoryAccumulativeOscillatory (coevolution)Resistance may carry fitness costs
Empiric usabilityHighLowLimits acute-care use
Clinical scalabilityMatureExperimentalAdoption depends on infrastructure

PK: pharmacokinetic; PD: pharmacodynamic.