From:  Janus-faced role of anti-infective drugs: a revisit through the lens of vascular ageing

 Evidence-tier classification of anti-infective agents based on the strength, type, and translational relevance of available data across mechanistic, animal, and human studies.

TierEvidence typesExamples of drug classesStrengthsLimitations
Tier 1: In vitro mechanistic evidenceDirect effects of ROS, mitochondrial potential, senescence markers, SASPFluoroquinolones, aminoglycosides, macrolides, tetracyclinesHigh mechanistic specificityNon-physiologic doses; lacks systemic physiology
Tier 2: In vivo animal evidenceEffects on vascular inflammation, stiffness, mitochondrial injury, and ECM remodelingTetracyclines, macrolides, antiretroviralsEnables causal inferenceSpecies differences: acute or artificial disease models
Tier 3: Human observational evidenceEndothelial dysfunction, arterial stiffness, inflammatory/metabolic shiftsAntiretrovirals, broad-spectrum antibioticsClinically meaningfulConfounding, heterogeneous endpoints; insufficient vascular-aging biomarkers

ECM: extracellular matrix; ROS: reactive oxygen species; SASP: senescence-associated secretory phenotype.