Medication use showed little overall link with flu vaccine antibody responses
An analysis in older adults found little overall association, with a narrower signal involving metformin and the higher-dose vaccine among participants with diabetes.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
Among older adults, medication use showed little overall relationship with antibody responses to influenza vaccination. Within participants with diabetes, metformin use was associated with a smaller response to the high-dose vaccine. That subgroup finding does not establish a drug effect, and antibody responses do not directly show how many infections were prevented.
Medication use was self-reported, and this abstract-based analysis cannot establish whether medication caused the subgroup difference. It reports antibody measurements rather than infection outcomes.
The overall pattern
The analysis considered medication count as well as statin and metformin use. The broad null pattern remained after accounting for frailty and chronic conditions, and when participants were grouped by sex or vaccine dose.
The diabetes subgroup
Vaccine dose was randomized, but the analysis compared reported medication use. Among participants with diabetes, the high-dose antibody response in metformin users was reduced relative to nonusers, while remaining slightly above responses to the standard dose.
The original publication
Medication count, including statin or metformin use, is not associated with influenza vaccine responses in older adults.
Li V, McClure H, Patel R et al.
Vaccine · 2025
- PubMed ID
- 41167013
- Record checked
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