Is Psyllium Husk Safe with Tetracycline?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Avoid taking psyllium husk within 4 hours of tetracycline. Take tetracycline with a full glass of water on an empty stomach, separated from all fiber supplements.
Why this interaction occurs
Psyllium husk can adsorb tetracycline in the GI tract and significantly reduce its oral bioavailability. Tetracycline is already prone to absorption interactions; the addition of soluble fiber creates a physical barrier and adsorption effect that can lower plasma concentrations below therapeutic thresholds.
Evidence
Evidence level: moderate.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 5,541 reports mentioning Tetracycline. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Tetracycline + supplement combination on this page.
FAERS reports are voluntary and cannot prove that a drug caused an event. Do not use report counts to assess the safety of this specific drug-supplement pair.
Frequently asked questions
Related interactions
All Psyllium Husk interactions → · All Tetracycline interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.