What does this research mean for the field?

Declared inactive ingredients are highly prevalent and variable across US oral drug listings, with avoidance-relevant excipients like lactose and gelatin present in every listing for nearly half of affected prescription generic-name groups. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To assess the prevalence, structured labeling coverage, and within-generic variation of declared inactive ingredients across oral drug listings in the United States.

August 24, 2026CureusOpen Access

Declared Inactive Ingredients in US Oral Drug Listings: A Reproducible Census of Prevalence, Labeling Coverage, and Within-Name Variation

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Authors

BSBrian StaigerUniversity at Buffalo, State University of New York

Discussion

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Implication

Cross-sectional study reveals high prevalence and variation of inactive ingredients in US oral drug listings, indicating substantial avoidance challenges for patients with excipient sensitivities.

Key Points

To assess the prevalence, structured labeling coverage, and within-generic variation of declared inactive ingredients across oral drug listings in the United States.
Analyzed a cross-sectional census of 50,005 distinct oral Product NDC listings matched to DailyMed Structured Product Labeling (SPL) with structured inactive ingredient declarations from openFDA data.
Quantified listing-level excipient burden, qualitative profiles, dosage forms, pharmacologic classes, and a predefined panel of avoidance-relevant excipients.
Oral drug listings declared a median of 9 excipients (interquartile range, 6–12; maximum, 41), with magnesium stearate (68.07%), titanium dioxide (53.27%), and microcrystalline cellulose (52.88%) being the most prevalent.
Avoidance-relevant excipients were common: lactose was declared in 39.34% of listings, synthetic color additives in 39.96%, and gelatin in 18.50%.
Among affected prescription generic-name groups, every observed listing declared the target excipient in 46.58% (306/657) of lactose-containing groups and 46.58% (150/322) of gelatin-containing groups.

Cite This Study

Brian Staiger (2026) studied this question.

synapsesocial.com/papers/6a8c0010bca056c88e6defd6 https://doi.org/10.7759/cureus.114947

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Implication

Cross-sectional study reveals high prevalence and variation of inactive ingredients in US oral drug listings, indicating substantial avoidance challenges for patients with excipient sensitivities.

Declared Inactive Ingredients in US Oral Drug Listings: A Reproducible Census of Prevalence, Labeling Coverage, and Within-Name Variation

Discussion

Member takes

Implication

Key Points

Cite This Study

Declared Inactive Ingredients in US Oral Drug Listings: A Reproducible Census of Prevalence, Labeling Coverage, and Within-Name Variation

Discussion

Member takes

Implication

Key Points

Cite This Study

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