Coffee and Thyroid Medication: How Long After Levothyroxine Can I Drink Coffee?
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If you take levothyroxine for an underactive thyroid, your first coffee of the day probably sits right next to your pill. That timing matters. So, how long after levothyroxine can I drink coffee? The NHS advises taking levothyroxine on an empty stomach, with water, 30 to 60 minutes before your first meal and before any caffeinated drink such as tea or coffee. Your doctor or pharmacist may give you a specific window, and their advice comes first.
The reason is not caffeine itself but absorption: in a small Italian study, espresso taken together with levothyroxine tablets reduced the amount absorbed by roughly a quarter to a third. Here is what the research shows, and a routine that makes waiting easy.
Key takeaways
- Take levothyroxine with water on an empty stomach, 30 to 60 minutes before breakfast and before coffee or tea, unless your doctor says otherwise.
- In a 2008 study, coffee taken with levothyroxine lowered absorption by about 27 to 36 percent compared with water.
- Waiting an hour removed the effect in that study’s patients.
- A small 2013 study suggested soft gel capsules were less affected by coffee, but changing formulation is a decision for your doctor.
- Consistency matters: take your dose the same way every day so your blood tests reflect your real routine.
In this article
How long after levothyroxine can I drink coffee?
The standard guidance is straightforward:
| Step | What to do | Source of the advice |
|---|---|---|
| Take the tablet | On an empty stomach, swallowed whole with a glass of water, same time each day | NHS |
| Wait | 30 to 60 minutes before your first meal, caffeinated drinks or other medicines | NHS |
| Then | Have your coffee and breakfast | NHS |
| Calcium, iron, antacids | These can also interfere; ask your pharmacist how far apart to take them | NHS |
Some doctors suggest taking levothyroxine at bedtime instead, well after their last meal. That is a valid option for some patients, but it changes your routine, so discuss it with your doctor rather than switching on your own.
What the research found
The 2008 espresso study
Researchers at the University of Messina, led by Salvatore Benvenga, noticed that eight women had unexpectedly high thyroid-stimulating hormone (TSH) levels despite taking their levothyroxine. All of them took it with coffee or espresso. In tests with patients and healthy volunteers, the team compared the medicine taken with water, with coffee, and with water followed by coffee an hour later. Their results were published in Thyroid in 2008.
| Measure (coffee vs water) | Patients | Volunteers |
|---|---|---|
| Average rise in blood T4 | 36% lower | 29% lower |
| Peak rise in blood T4 | 30% lower | 19% lower |
| Total absorption (area under the curve) | 36% lower | 27% lower |
| Time to peak | About 38 minutes later | About 43 minutes later |
According to the American Thyroid Association’s summary of the study, the effect varied from person to person and appeared only when espresso was taken at the same time as the tablet, not 60 minutes later. The effect was real but smaller than that of known culprits such as some antacids or bran.
The 2013 soft gel study
The same group later tested a soft gel capsule form of levothyroxine. In a very small study published in Endocrine, patients who took capsules with coffee had thyroid results similar to taking them an hour before coffee, unlike with tablets. The authors suggested capsules could suit people who cannot change their habit, but the study was tiny and preliminary.
What these studies do not tell us
- They are small: single digits of patients in each group.
- They tested regular coffee and espresso. There is no good evidence that decaf is safe to take together with the tablet, so apply the same wait.
- They do not mean coffee is harmful for people with thyroid conditions; the issue is timing.
Why coffee interferes
The Messina researchers also ran laboratory tests comparing coffee with substances known to bind levothyroxine, such as some antacids and fibers. They reported that coffee did not change stomach acidity, gastric emptying or intestinal transit in volunteers. That points to coffee interfering with absorption of the medicine in the gut itself, which is why separating them in time helps. It is a similar principle to the one in our article on coffee and iron absorption.
A simple morning routine
- Keep the tablets by the bed with a glass of water. Take your dose as soon as you wake up.
- Start the clock. Shower, dress, walk the dog. Thirty to sixty minutes goes quickly.
- Prepare coffee in advance. Set a programmable drip machine, or keep cold brew in the fridge so it is ready when your window ends.
- Then breakfast and coffee together.
- Be consistent. Your dose is adjusted to your usual routine. If you change your habit, for example starting to wait when you did not before, tell your doctor, since your TSH may shift and need rechecking.
If waiting is not possible on some days, do not double up or skip doses on your own; ask your pharmacist what to do.
Mind your total caffeine
For most healthy adults, the FDA and EFSA consider up to 400 mg of caffeine a day acceptable, with single doses of up to about 200 mg; EFSA advises up to 200 mg a day in pregnancy. Our guide to how much caffeine is too much has the details.
Have your coffee ready when the wait is over
A coffee that is ready the moment your window ends makes the routine easier to stick to. Our Cold Brew Coffee is coarse ground for steeping overnight, so a smooth glass waits in the fridge. If you prefer hot coffee from a timer-set drip machine, Breakfast Blend is a smooth, nutty medium roast. Browse more in our best sellers.
Coffee and levothyroxine FAQ
Can I drink coffee 30 minutes after levothyroxine?
The NHS window is 30 to 60 minutes. Many people use 30 minutes; your doctor may recommend longer, especially if your TSH is hard to control.
Does decaf affect levothyroxine?
It has not been well studied. Since the problem appears to be absorption rather than caffeine, treat decaf like regular coffee and wait.
What about tea?
The NHS lists tea alongside coffee as a caffeinated drink to have after your dose.
Can I take levothyroxine with coffee if I switch to capsules or liquid?
A small study found soft gel capsules less affected by coffee, but any change of formulation should be agreed with your doctor.
Should I stop drinking coffee if I have hypothyroidism?
Nothing in these studies suggests that. The key is separating coffee from your dose.
Sources
- Levothyroxine: a medicine for an underactive thyroid, NHS.
- Benvenga S. et al. Altered intestinal absorption of L-thyroxine caused by coffee. Thyroid, 2008.
- Coffee can decrease the absorption of thyroid hormone, Clinical Thyroidology for Patients, American Thyroid Association.
- Vita R. et al. A novel formulation of L-thyroxine reduces the problem of L-T4 malabsorption by coffee. Endocrine, 2013.
Facts checked in October 2026.
This article is for general information only and is not medical advice. If you have a health condition, are pregnant or take medication, ask your doctor before changing your caffeine intake.
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