Component
Phenobarbital
Phenobarbital. Species, exposure and limitations are retained in each linked claim.
1 recorded relationships. Experimental role, claim status and evidence remain attached to each record.
How nutrients influence it
Every nutrient with a recorded effect on this component, credited to the nutrient that acted rather than the chapter that recorded it. Open a nutrient to see the findings and the conditions they were measured under.
Other things that act on it
Enzymes, hormones, genes, and other components with a recorded effect. These are not nutrients, so they do not count toward the arrows above. Each finding names the chapter that recorded it.
How nutrients reach it in more than one step
Chains of two or more recorded steps that end here, grouped by the nutrient they start from. Each step is a separate finding, so a chain is a route a mechanism could take, not proof that it does.
Tracing routes…
What it does
Every recorded relationship this component is part of, grouped by its role. Plain wording comes first; the technical statement follows.
Where it participates (unsigned role)
Urinary bisnorbiotin was higher in both carbamazepine/phenytoin-treated and phenobarbital-treated children than in controls.
Experimental context and source evidence
- availability_state
- biomarker_context Imported condition classification; unverified.
- evidence_span
- {"source_cache": "artifacts/biotin-research/9523856.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "a337d853fbf3d26e053dfd6d17b2e1729c993a0501563d0524ebbee7b44d5136", "start_char": 0, "end_char": 1876, "text_sha256": "a337d853fbf3d26e053dfd6d17b2e1729c993a0501563d0524ebbee7b44d5136"}
- experimental_model
- Observational urine comparison: 7 children receiving carbamazepine/phenytoin, 6 phenobarbital, 16 controls
- exposure
- Long-term anticonvulsant treatment
- limitations
- Untimed urine, small nonrandomized groups and discordant markers limit diagnosis; faster turnover is not a universal deficiency diagnosis.
- nutrient_topic
- Biotin research collection; topical membership is not evidence of a direct dietary effect. · Biotin
- organism
- Homo sapiens
- plain_language
- Some anticonvulsant-treated children excreted more of a biotin breakdown product.
- primary_references
- [b7-p9523856] Disturbances in biotin metabolism in children undergoing long-term anticonvulsant therapy. (1998). https://pubmed.ncbi.nlm.nih.gov/9523856/ DOI: 10.1097/00005176-199803000-00002
- tissue_or_cell_type
- Urine
- trigger_kind
- biomarker_context Imported condition classification; unverified.
Biotin: carboxylases, recycling, deficiency and nutrient interactions (2026-09-17) · lines 299–310
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Observational urine comparison: 7 children receiving carbamazepine/phenytoin, 6 phenobarbital, 16 controls · source_derived_draft · unverified_draft
### b7-drug-bisnorbiotin Urinary bisnorbiotin was higher in both carbamazepine/phenytoin-treated and phenobarbital-treated children than in controls. Condition category: biomarker_context nutrient_topic: Biotin research collection; topical membership is not evidence of a direct dietary effect. plain_language: Some anticonvulsant-treated children excreted more of a biotin breakdown product. organism: Homo sapiens tissue_or_cell_type: Urine experimental_model: Observational urine comparison: 7 children receiving carbamazepine/phenytoin, 6 phenobarbital, 16 controls limitations: Untimed urine, small nonrandomized groups and discordant markers limit diagnosis; faster turnover is not a universal deficiency diagnosis. exposure: Long-term anticonvulsant treatment evidence_span: {"source_cache": "artifacts/biotin-research/9523856.abstract.txt", "locator": "Exact primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "a337d853fbf3d26e053dfd6d17b2e1729c993a0501563d0524ebbee7b44d5136", "start_char": 0, "end_char": 1876, "text_sha256": "a337d853fbf3d26e053dfd6d17b2e1729c993a0501563d0524ebbee7b44d5136"} [b7-p9523856] Disturbances in biotin metabolism in children undergoing long-term anticonvulsant therapy. (1998). https://pubmed.ncbi.nlm.nih.gov/9523856/ DOI: 10.1097/00005176-199803000-00002
Complete structured claim and evidence
The events it takes part in
A mechanism often involves more than two components. These are the full events, with every participant and its role.
Situations it appears in
Low-supply and faulty-machinery situations recorded in the chapters where this component plays a part.
In the sources
Preserved passages that mention this component, quoted exactly. Open one to read it in context.
Open hypotheses
Proposed ideas that involve this component. They are labeled as hypotheses and do not change any recorded statement.
This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.