The short answer
A reduction in digoxin exposure from psyllium husk powder is not established. A small trial with a defined ispaghula product found no level change; review your product and schedule.
What this answer covers
Psyllium husk powder with oral digoxin; the original trial used a specific ispaghula formulation, not every husk preparation.
- Supplement or preparation
- Psyllium Husk Powder
- Medication ingredient
- digoxin
A clinical trial found no reduction
In30 geriatric inpatients, a four-week study compared wheat bran and an ispaghula product during digoxin treatment. Ispaghula did not change digoxin levels at either measured time. Wheat bran had a temporary effect, illustrating why different fiber products should not be treated as interchangeable.
The product limits the conclusion
The studied ispaghula formulation was Vi-Siblin S. The inspected abstract does not establish that every current husk powder, dose or timing schedule behaves the same way. A small negative trial provides useful counterevidence, but cannot guarantee safety for every patient.
Keep the pharmacist informed
The digoxin label notes reduced absorption with high-bran meals, which is a different exposure from psyllium. Ask the pharmacist to review your exact fiber product and any monitoring needed when it changes. Do not increase digoxin to compensate for an assumed fiber effect.
Know when to seek assessment
Contact your clinician about new nausea, loss of appetite, visual changes, marked weakness or an unusually slow or irregular pulse. These may have several causes, including digoxin toxicity. Blood results must be interpreted with symptoms, kidney function and electrolytes; do not adjust digoxin yourself.
Evidence and practical considerations
Absorption & effectiveness
A specific ispaghula preparation did not reduce digoxin concentrations in a small clinical trial; a class-wide psyllium absorption reduction remains unproven.
- Exact scope
- Psyllium husk powder with oral digoxin; the original trial used a specific ispaghula formulation, not every husk preparation. with Exact digoxin RxCUI3407 IN, confirmed by current RxNorm. Oral125/250microgram tablets; oral absorption evidence is not transferred to IV digoxin. Digoxin is distinct from digitoxin.
- Medication form and route
- Oral
What remains uncertain
- Specific small negative trial and different fiber warning; no universal dose, timing or food restriction.
Factors that may matter: Exact preparation and dose; Kidney function; Baseline electrolyte status; Other medicines.
Read the supporting source summaries
Source 1: Current prescribing information
dailymed.nlm.nih.gov · Source check Sep 10, 2026
Population: Patients prescribed oral digoxin tablets.
Antacids and St.John’s wort can lower concentrations. Hypokalemia, hypomagnesemia and hypercalcemia predispose to toxicity; assess electrolytes/renal function. Some substances interfere with assays without proving increased drug exposure.
How this applies: Exact medication label. Exact digoxin RxCUI3407 IN, confirmed by current RxNorm. Oral125/250microgram tablets; oral absorption evidence is not transferred to IV digoxin. Digoxin is distinct from digitoxin.
No universal nutrient spacing or vitaminD replacement need. Clinical state, assay method and formulation must be considered.
Source 2: Original clinical research
pubmed.ncbi.nlm.nih.gov · Source check Sep 10, 2026
Population: 30 geriatric inpatients randomized to wheat bran or ispaghula with ongoing digoxin.
Ispaghula did not influence digoxin levels at either time; wheat bran lowered levels at2weeks but not4weeks, remaining therapeutic.
How this applies: Applicability is limited to the stated exact medication, preparation and endpoint; other-drug evidence is indirect.
Abstract-only; specific ispaghula formulation, not every husk powder or dosing schedule. Label high-bran warning is not exact psyllium evidence.
Source 3: Medication terminology
rxnav.nlm.nih.gov · Source check Sep 10, 2026
Population: Terminology.
digoxin is IN.
How this applies: Exact ingredient.
Not clinical evidence.
Research assessment: · Open full citations ↗
Review and change history
- Publication status
- Published research summary
- Clinical review
- Not yet recorded
| Date | Update |
|---|---|
| Article prepared | |
| Sources checked and article drafted. | |
| Research summary published |
Article revision: c91a64c40e45e5bd
This guide brings together the evidence records used by our interaction checker. Each finding retains its own preparation limits, research date, and source summaries.
Full citations require verification. Reading this answer and the source summaries does not.
Taking other supplements or medications?
Use the checker to explore your other combinations. Ask a pharmacist to review the exact products, amounts and medical conditions in your complete list.
Open the interaction checkerInformation, not medical advice. Do not change prescribed treatment based on this guide.