calcium carbonate + magnesium carbonate, heavy · Medicine question

How can Rennie Peppermint affect the absorption of levothyroxine?

Name: How can Rennie Peppermint affect the absorption of levothyroxine?
Published: 2026-11-08T01:39:10.899Z

iatroX medicinesPublished 8 November 2026

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Rennie Peppermint’s calcium or magnesium may form complexes with levothyroxine, decreasing its absorption, so a 1–2 hour interval between the medicines is preferable.

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Rennie PeppermintBayer plc · emc · SmPC §4.5 Interaction with other medicinal products · Version 2Document updated 6 April 2023

Sources checked 8 November 2026

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