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Warning of drinking coffee with medicines and vitamins

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  • Popular Post

This might already be known to many, but I came across it recently. I've never had a doctor tell me to avoid coffee before taking medications or vitamins. Indeed on the prescription label it usually just says 'take one tablet after breakfast (or a meal)"

Here is a summary from AI on why you need to wait an hour after coffee before taking certain meds and vitamins - or better still to wait an hour after breakfast and meds before drinking coffee (a big ask for many coffee drinkers)

AI Summary

Coffee contains caffeine, tannins, and acids that can bind to nutrients, flush out water-soluble vitamins, or alter how your body absorbs prescription drugs, making them less effective or causing unwanted side effects.

How Coffee Affects Vitamins and Supplements

  • Iron: Coffee’s polyphenols and tannins bind to iron and can block up to 90% of its absorption. [1, 2]

  • Calcium and Vitamin D: Caffeine decreases calcium absorption in the gut, increases calcium loss in urine, and can interfere with vitamin D receptors. [1, 2, 3]

  • B and C Vitamins: Coffee acts as a mild diuretic, which can flush water-soluble vitamins out of your system before your body absorbs them. [1, 2]

How Coffee Affects Medications

  • Thyroid Drugs: Coffee can cut the absorption of medications like levothyroxine by more than half. [1]

  • Osteoporosis Pills: Taking bone-density drugs with anything other than plain water drastically reduces their uptake. [1]

  • Antidepressants & Antipsychotics: Caffeine can change how your liver breaks these down, leading to lower effectiveness or increased jitters and heart palpitations. [1, 2]

  • Asthma inhalers or pills: Caffeine adds to nervous jitters and fast heartbeats.

  • Stimulant Medicines: Combining coffee with cold or allergy meds containing decongestants can cause a fast heart rate or high blood pressure. [1, 2]

Safe Timing

  • Wait 1 to 2 hours: Separate your coffee break from the time you take your vitamins or medicines by at least one to two hours to ensure your body absorbs them properly.

  • Use water: Always swallow pills and supplements with a full glass of plain water instead of coffee, tea, or juice.

Edited by ronnie50

  • Replies 32
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  • wavodavo
    wavodavo

    Who in their right mind would follow the medical advice of AI ? The information that you get out of it is only as good as what is put in it so how can you trust it for something like medical recommend

  • scubascuba3
    scubascuba3

    The other issue underestimated is medication that can damage the stomach etc so need to have with food or maybe even omeprazole

  • ronnie50
    ronnie50

    Yes. And you need to take that an hour before the other med. Omeprazole and Esomeprazole (like Nexium) are meant to be short term medications, but many end up taking them for many years - even decades

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  • Popular Post

The other issue underestimated is medication that can damage the stomach etc so need to have with food or maybe even omeprazole

  • Author
  • Popular Post
1 hour ago, scubascuba3 said:

The other issue underestimated is medication that can damage the stomach etc so need to have with food or maybe even omeprazole

Yes. And you need to take that an hour before the other med. Omeprazole and Esomeprazole (like Nexium) are meant to be short term medications, but many end up taking them for many years - even decades - and eventually that can lower your stomach's ability to absorb vitamins and nutrients from food or other meds.

  • Author

I also found this. If you take heart medications, wait 1-2 hours after drinking coffee before taking the meds. Kind of weird why no doctor or pharmasist would tell you this, isn't it? How would you know?

How Coffee Interacts with Cardiac Drugs

  • Blood pressure medications: Caffeine can temporarily spike blood pressure and interfere with absorption, making drugs like beta-blockers or calcium channel blockers less effective. [1, 2, 3]

  • Heart rhythm drugs: Caffeine can block the action of specific arrhythmia treatments like adenosine or interfere with cardiac stress test medications. [1]

  • Stimulant overlap: Combining coffee with certain respiratory or cold medications that raise heart rate can cause severe jitters and palpitations. [1, 2]

Safe Habits

  • Space it out: Wait at least one to two hours between taking your heart pills and drinking coffee.

  • Use water: Always swallow your prescription pills with plain water instead of coffee.

  • Ask your doctor: Check with a pharmacist or cardiologist about your exact prescription limits.

  • Popular Post

FYI, coffee is a MILD diuretic; it would take several cups to "Flush" your system. A cup of coffee in the morning is not going to flush your vitamins.

  • Popular Post

On 8/17/2026 at 11:22 AM, ronnie50 said:

This might already be known to many, but I came across it recently. I've never had a doctor tell me to avoid coffee before taking medications or vitamins. Indeed on the prescription label it usually just says 'take one tablet after breakfast (or a meal)"

Here is a summary from AI on why you need to wait an hour after coffee before taking certain meds and vitamins - or better still to wait an hour after breakfast and meds before drinking coffee (a big ask for many coffee drinkers)

AI Summary

Coffee contains caffeine, tannins, and acids that can bind to nutrients, flush out water-soluble vitamins, or alter how your body absorbs prescription drugs, making them less effective or causing unwanted side effects.

How Coffee Affects Vitamins and Supplements

  • Iron: Coffee’s polyphenols and tannins bind to iron and can block up to 90% of its absorption. [1, 2]

  • Calcium and Vitamin D: Caffeine decreases calcium absorption in the gut, increases calcium loss in urine, and can interfere with vitamin D receptors. [1, 2, 3]

  • B and C Vitamins: Coffee acts as a mild diuretic, which can flush water-soluble vitamins out of your system before your body absorbs them. [1, 2]

How Coffee Affects Medications

  • Thyroid Drugs: Coffee can cut the absorption of medications like levothyroxine by more than half. [1]

  • Osteoporosis Pills: Taking bone-density drugs with anything other than plain water drastically reduces their uptake. [1]

  • Antidepressants & Antipsychotics: Caffeine can change how your liver breaks these down, leading to lower effectiveness or increased jitters and heart palpitations. [1, 2]

  • Asthma inhalers or pills: Caffeine adds to nervous jitters and fast heartbeats.

  • Stimulant Medicines: Combining coffee with cold or allergy meds containing decongestants can cause a fast heart rate or high blood pressure. [1, 2]

Safe Timing

  • Wait 1 to 2 hours: Separate your coffee break from the time you take your vitamins or medicines by at least one to two hours to ensure your body absorbs them properly.

  • Use water: Always swallow pills and supplements with a full glass of plain water instead of coffee, tea, or juice.

Who in their right mind would follow the medical advice of AI ? The information that you get out of it is only as good as what is put in it so how can you trust it for something like medical recommendations ? What if a genius like RFK was working in the data centre and was enlighting AI about medical topics from his vast knowledge in that field. Would you make crucial health decisions based on AI ?..I wouldn't. All you gotta do is follow the instructions on the Dr's prescription.

I shall add this information to the list of reasons why I do my level best to avoid doctors, medications and supplements.

Now go back and ask a prompt about decaff and medicines.

Or half caff half decaff (The Hollywood-Mid Wilshire).

Asthma inhalers or pills: Caffeine adds to nervous jitters and fast heartbeats.

The LLM is leaving out excessive caffeine increases your heart rate and can make you feel jittery, regardless of your medication.

Yeah, that means you drank too much coffee. Duh.

AFAIK, no asthma medicine amps you up.

That's an absurd response to put under this category, but the LLM had to throw something in there, however lame.

LLMs sometimes act like mentally handicapped 11 year olds.

Optimizing timing of caffeine consumption << lifespan optimization

You need to address the root causes of improper diet & exercise underlying the diseases you're taking medication for rather than worrying about the timing of the #1 antioxidant consumed by Americans.

An Americano is just an watered down espresso. 😃

giphy (18).gif

  • Popular Post
33 minutes ago, Moonlover said:

I shall add this information to the list of reasons why I do my level best to avoid doctors, medications and supplements.

I shall add this information to the list of reasons not to always trust AI. I saw so many videos of one guy testing Chat GPT with different challenges. AI fails sometimes completely and mixes wrong infos. You cannot just believe everything AI tells you. Of course it has its good sides but be careful.

29 minutes ago, msbkk said:

I shall add this information to the list of reasons not to always trust AI. I saw so many videos of one guy testing Chat GPT with different challenges. AI fails sometimes completely and mixes wrong infos. You cannot just believe everything AI tells you. Of course it has its good sides but be careful.

Yes, that's a very good point. But I have to add that I've been avoiding doctors, medications and supplements for a lot longer than AIs been around.

  • Author
1 hour ago, wavodavo said:

Who in their right mind would follow the medical advice of AI ? The information that you get out of it is only as good as what is put in it so how can you trust it for something like medical recommendations ? What if a genius like RFK was working in the data centre and was enlighting AI about medical topics from his vast knowledge in that field. Would you make crucial health decisions based on AI ?..I wouldn't. All you gotta do is follow the instructions on the Dr's prescription.

Doctors don't tell you about interactions in Thailand, very few even ask what other meds you're on. Do a bit of reseearch next time instead of personal insults. I'm not saying don't drink coffee, neither are the researchers. They are saying don't take them at the same time as certain meds and vitamins. Make your own enquiry with the Dr,

Sources:

https://www.uhhospitals.org/blog/articles/2025/06/10-medications-that-dont-mix-well-with-coffee

https://www.health.com/medications-to-not-mix-with-coffee-7561446

https://www.victorchang.edu.au/blog/coffee-caffeine-and-heart-disease

https://www.health.harvard.edu/healthy-aging-and-longevity/rethinking-your-morning-coffee

https://pubmed.ncbi.nlm.nih.gov/18094346/

https://www.facebook.com/OSUWexnerMedicalCenter/posts/taking-your-vitamins-with-your-morning-coffee-you-might-be-washing-away-their-be/1443304797824826/

6 minutes ago, ronnie50 said:

Doctors don't tell you about interactions in Thailand, very few even ask what other meds you're on. Do a bit of reseearch next time instead of personal insults. I'm not saying don't drink coffee, neither are the researchers. They are saying don't take them at the same time as certain meds and vitamins. Make your own enquiry with the Dr,

Sources:

https://www.uhhospitals.org/blog/articles/2025/06/10-medications-that-dont-mix-well-with-coffee

https://www.health.com/medications-to-not-mix-with-coffee-7561446

https://www.victorchang.edu.au/blog/coffee-caffeine-and-heart-disease

https://www.health.harvard.edu/healthy-aging-and-longevity/rethinking-your-morning-coffee

https://pubmed.ncbi.nlm.nih.gov/18094346/

quote : "Doctors don't tell you about interactions in Thailand, very few even ask what other meds you're on"

I do have other experiences in Bangkok and private hospitals. Depending on the prescribed medications doctors always have asked me.

Edited by msbkk

You'd think that uncommon, common sense would kick in, when taking any meds, and one would Google food interactions with said meds.

Amazing that people wouldn't verify such info themselves.

The internet isn't only good for complaining about everything on AN. There is life out there, and not always to be spent on the bar stool.

Edited by KhunLA

13 minutes ago, msbkk said:

quote : "Doctors don't tell you about interactions in Thailand, very few even ask what other meds you're on"

I do have other experiences in Bangkok and private hospitals. Depending on the prescribed medications doctors always have asked me.

Whenever I go to a new Doctor I bring a list of my medications and the same applies when being admitted to hospital. Everyone should do that.

1 hour ago, wavodavo said:

Whenever I go to a new Doctor I bring a list of my medications and the same applies when being admitted to hospital. Everyone should do that.

Agree - my meds along with emergency information are in a PDF - I carry a printout in my wallet and a copy on my phone.

To return to the thread subject, I've told my doctor about my coffee drinking habits, and no doctor, GP or heart specialist has ever told me to time my coffee and meds in any way. I therefore cast doubt on this whole thread.

indeed to quote the OP "I've never had a doctor tell me to avoid coffee before or after taking medications....."

Edited by VBF

6 minutes ago, VBF said:

Agree - my meds along with emergency information are in a Word doc - I carry a printout in my wallet and a copy of the doc on my phone as a PDF.

Unfortuneatey I am not so tech savvy as you so I stick to the old pen and paper method. That still works o.k.

1 minute ago, wavodavo said:

Unfortuneatey I am not so tech savvy as you so I stick to the old pen and paper method. That still works o.k.

@wavodavo I was editing and we crossed over - but yes indeed your method is perfectly fine. 👍

  • Author

I also bring a list with me everywhere in Thailand. Because I know most won't ask about other meds or warn of contraindications between meds.

I guess one issue is that Thailand does not have a system of family doctors like in many of our countries who would have a full record, particularly in countries with universal health care as everything about you is recorded in one place.

Having said that, even in a Thai hospital that you try to make your main care facility - they still don't read anything in your file. The doctor's look at their speciality area but nothing else, and the pharmasist always asks you "are you allergic to any medications"? "Yes, IT SAYS SO ON THE SCREEN IN FRONT OF YOU."

...Caffeine Is Often Added To Medications As A Catalyst Though, Isn't It... (?)

...From My Much Brighter Associate...

Caffeine is added to medications as an adjuvant (a booster) to enhance the pain-relieving power of common analgesics like paracetamol, aspirin, and ibuprofen, particularly for headaches and migraines. It helps the body absorb the active drug faster and provides an extra boost against pain.

Why Caffeine is Added

  • Boosts Pain Relief: It makes basic painkillers work better for more people.

  • Speeds Absorption: It helps the main medicine get into your system faster.

  • Constricts Blood Vessels: In migraine and headache formulas, it helps narrow swollen blood vessels in the brain.

Common Uses

  • Over-the-counter migraine and tension headache pills

  • Some combination cold and flu formulas

***

Statines, fi are used worldwide, big industrie.

It helps one way, but destroys your body other way. breaking down Q10 enzym and your muscle.

It can have some more negative side effects, depends on your body acceptence.

Doctors dont tell you anything, you have to find out.

I got headache after a year "medicines" , doc said , it is migraine. However found out it is due to statines.

At first didnt think about the "medicines", until I did.

So I had to tell doc ! Doc changed statines, as there are several, but still statines. It only got worse.

At one point had such severe headache, I wanted to die ! I told the doc to shove the statines in a dark place.

Now I have a "medicine", it can cause gangreen and i could have B12 vitamine dissuffciency !

Doctors DONT tell, you must read yourself, study and keep your body on watch.

And that is with everything you consume.

Thailand uses aggriculture stuf for nice vegetables, however in western world those substances are FORBIDDEN long time. You are worrying about the coffee?

  • Author
4 hours ago, SOTIRIOS said:

..Caffeine Is Often Added To Medications As A Catalyst Though, Isn't It... (?)

...From My Much Brighter Associate...

Caffeine is added to medications as an adjuvant (a booster) to enhance the pain-relieving power of common analgesics like paracetamol, aspirin, and ibuprofen, particularly for headaches and migraines.

No argument. Like I said it counteracts with some meds indicated in the lists above - not all. It depends. That doesn't mean coffee is bad. I drink coffee everyday.

On 8/17/2026 at 6:38 AM, ronnie50 said:

I also found this. If you take heart medications, wait 1-2 hours after drinking coffee before taking the meds. Kind of weird why no doctor or pharmasist would tell you this, isn't it? How would you know?

How Coffee Interacts with Cardiac Drugs

  • Blood pressure medications: Caffeine can temporarily spike blood pressure and interfere with absorption, making drugs like beta-blockers or calcium channel blockers less effective. [1, 2, 3]

  • Heart rhythm drugs: Caffeine can block the action of specific arrhythmia treatments like adenosine or interfere with cardiac stress test medications. [1]

  • Stimulant overlap: Combining coffee with certain respiratory or cold medications that raise heart rate can cause severe jitters and palpitations. [1, 2]

Safe Habits

  • Space it out: Wait at least one to two hours between taking your heart pills and drinking coffee.

  • Use water: Always swallow your prescription pills with plain water instead of coffee.

  • Ask your doctor: Check with a pharmacist or cardiologist about your exact prescription limits.

Also, be very careful when taking heart meds that have diuretics. My Cardiologue didn’t tell me, one day fainted in the street, shakes, really bad. Ambulance to hospital. They did a blood test , results, I dint have a micro gram of Potassium left in my body and was put on a potassium drip for over 12 hours, and wow, the pain is bad, particular to Potassium. I should have been told this, wasn’t, and should have had a regular blood test !!! Needless to say, new cardiologue and a meds that didn’t act as diuretic. ( it was Hydacand by the way)

On 8/16/2026 at 11:02 PM, ronnie50 said:

Yes. And you need to take that an hour before the other med. Omeprazole and Esomeprazole (like Nexium) are meant to be short term medications, but many end up taking them for many years - even decades - and eventually that can lower your stomach's ability to absorb vitamins and nutrients from food or other meds.

FYI Most Vitamins are absorbed in the intestines not stomach. (according to facts based on research, not facebook 😁)

On 8/17/2026 at 11:38 AM, ronnie50 said:

I also found this. If you take heart medications, wait 1-2 hours after drinking coffee before taking the meds. Kind of weird why no doctor or pharmasist would tell you this, isn't it? How would you know?

How Coffee Interacts with Cardiac Drugs

  • Blood pressure medications: Caffeine can temporarily spike blood pressure and interfere with absorption, making drugs like beta-blockers or calcium channel blockers less effective. [1, 2, 3]

  • Heart rhythm drugs: Caffeine can block the action of specific arrhythmia treatments like adenosine or interfere with cardiac stress test medications. [1]

  • Stimulant overlap: Combining coffee with certain respiratory or cold medications that raise heart rate can cause severe jitters and palpitations. [1, 2]

Safe Habits

  • Space it out: Wait at least one to two hours between taking your heart pills and drinking coffee.

  • Use water: Always swallow your prescription pills with plain water instead of coffee.

  • Ask your doctor: Check with a pharmacist or cardiologist about your exact prescription limits.

So take your hypertension meds at bed time, with water, and hit the coffee pot with impunity at first light.

Sorted.

1 hour ago, NanLaew said:

So take your hypertension meds at bed time, with water, and hit the coffee pot with impunity at first light.

Sorted.

Conclusion is imperative. Stop taking your medicine and stop drinking coffee. Also stop exercising. Every bodily movement causes "wear and tear", like in a car, motor etc etc

The oldest people have something in common: They have moved as little as possible over the last 20 years, drank plenty of booze and smoked like a chimney. 😊

  • Author
6 hours ago, NanLaew said:

So take your hypertension meds at bed time, with water, and hit the coffee pot with impunity at first light.

Sorted.

Maybe. But the instructions on mine are to be taken after breakfast. So now I just wait an hour or so, then take them.

  • Author
8 hours ago, thjames007 said:

FYI Most Vitamins are absorbed in the intestines not stomach. (according to facts based on research, not facebook 😁)

Correct. Fat soluable. But with vitamins, there is something in the coffee that clings to the vitamin disrupting it's full effectiveness. So it's not the diuretic effect with them like it is with water soluable meds.

5 minutes ago, ronnie50 said:

Maybe. But the instructions on mine are to be taken after breakfast. So now I just wait an hour or so, then take them.

Is that the doctor's or the prescription's instructions?

The manufacturer of my HT medication says either in the evening a few hours before sleep or a few hours after waking up is acceptable, as long as you don't randomly do either.

22 hours ago, msbkk said:

I shall add this information to the list of reasons not to always trust AI. I saw so many videos of one guy testing Chat GPT with different challenges. AI fails sometimes completely and mixes wrong infos. You cannot just believe everything AI tells you. Of course it has its good sides but be careful.

When AI makes things up, the industry calls it a 'hallucination.' This makes it all sound rather benign and harmless, and more acceptable than wrong, incorrect or, in the case of important medications, DIY electrical repairs and nuclear war, downright dangerous.

  • Author
18 minutes ago, NanLaew said:

Is that the doctor's or the prescription's instructions?

I think they'd be one and the same? Pharmacist just copies doctor's instructions before dispensing.

Edited by ronnie50

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