Coffee can reduce the absorption of levothyroxine when taken at the same time. Drinking coffee immediately after taking levothyroxine can decrease the drug's absorption by up to 30 percent, potentially leading to inadequate thyroid hormone levels and the need for higher doses.
How This Interaction Works (Mechanism)
Coffee stimulates gastric motility and increases intestinal peristalsis, which reduces the transit time of levothyroxine through the absorptive regions of the small intestine. Coffee also increases gastric acid secretion, which may alter the dissolution of levothyroxine tablets. Some studies suggest that coffee's polyphenols may bind to levothyroxine, reducing its bioavailability. The effect is most pronounced with espresso and unfiltered coffee.
Source: Thyroid Journal, Endocrine Society, 2024
Wait at least 30 to 60 minutes after taking levothyroxine before drinking coffee. Take levothyroxine with a full glass of plain water on an empty stomach immediately upon waking. If you find it difficult to wait before your morning coffee, ask your doctor about taking levothyroxine at bedtime instead (at least 3 hours after your last meal). Liquid or gel cap formulations of levothyroxine may be less affected by coffee.
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Open Interaction CheckerFrequently Asked Questions
Levothyroxine and Coffee have a mild interaction. In most cases, they can be taken together with appropriate precautions, but you should discuss the combination with your doctor or pharmacist to ensure safety based on your individual health profile.
Coffee can reduce the absorption of levothyroxine when taken at the same time. Drinking coffee immediately after taking levothyroxine can decrease the drug's absorption by up to 30 percent, potentially leading to inadequate thyroid hormone levels and the need for higher doses.
Yes. Anytime you are taking multiple medications, supplements, or substances, you should inform your doctor and pharmacist. They can evaluate your specific risk factors (age, kidney function, other medications, medical conditions) and determine whether the Levothyroxine and Coffee combination is safe for you, or whether adjustments are needed.
Related Resources
- Supplement interactions with Levothyroxine on Health Britannica
- Supplement interactions with Coffee on Health Britannica
- Levothyroxine prices and pharmacy comparison on RxGrab
- Coffee prices and pharmacy comparison on RxGrab
- Full drug interaction checker tool
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