Is Iron Safe with NP Thyroid?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Administer NP Thyroid on an empty stomach and separate iron supplements by at least 4 hours. Recheck TSH levels 6-8 weeks after starting or stopping iron supplementation.
Why this interaction occurs
Iron supplements bind to both T3 and T4 components present in NP Thyroid (desiccated thyroid), significantly impairing gastrointestinal absorption. This can lead to under-replacement and worsening hypothyroid symptoms if not properly timed.
Evidence
Evidence level: strong.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 159,569 reports mentioning NP Thyroid. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the NP Thyroid + 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 Iron interactions → · All NP Thyroid interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.