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Interazioni tra farmaci

Cholestyramine + Levothyroxine

Gravità: Maggiore

Cholestyramine and Levothyroxine: major interaction.

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Sintesi

Cholestyramine markedly reduces levothyroxine absorption, which can cause hypothyroidism or loss of TSH suppression in treated patients.

Cosa significa questa interazione in parole semplici

Cholestyramine and Levothyroxine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.

Cholestyramine belongs to Cardiovascular; Levothyroxine belongs to Endocrine.

Livello di evidenza: High

Perché avviene

Resin binds levothyroxine in the gut and prevents its absorption.

Cosa fare

Separate levothyroxine from cholestyramine by at least 4 hours. Check TSH after starting or stopping the resin and adjust the dose.

Cosa chiedere al farmacista

  • Does the benefit of taking both outweigh the risk in my case?
  • Do I need any blood test, ECG or other check while on both?
  • What early warning signs should I watch for, and what should I do if they appear?

Bring a full list of your medicines, including over-the-counter products, supplements and herbal remedies, to every pharmacy visit.

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Domande frequenti

Can I take Cholestyramine with Levothyroxine?

MediHelp rates the interaction as major. Cholestyramine and Levothyroxine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Cholestyramine markedly reduces levothyroxine absorption, which can cause hypothyroidism or loss of TSH suppression in treated patients.

How serious is the interaction between Cholestyramine and Levothyroxine?

MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Separate levothyroxine from cholestyramine by at least 4 hours. Check TSH after starting or stopping the resin and adjust the dose.

What other medicines interact with Cholestyramine?

MediHelp also lists interactions of Cholestyramine with, for example, Cholic acid, Deferasirox, Leflunomide. The full list is on the Cholestyramine page.

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