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Ask HN: Should grapefruit juice have warning labels for medicine interactions?
I recently saw a short documentary with a case where someone had an overdose because of interaction with medicines and grapefruit juice.
This is apparently due to substances in grapefruit that interact with an enzyme used to metabolize some medicines.
Warning labels in the leaflet seems like a very inefficient solution. Why isn't the warning placed on products containing grapefruit?
- CADAKA 4y agoMaybe the warning should be on the medicine?
- enlyth 4y agoBecause what are you going to put on the grapefruit juice label, a list of thousands of drugs that can have interactions with it? If people don't read the leaflets to their medication that's really on them. It's surprising that people would take any medication without reading the leaflet anyway, given that grapefruit is not the only thing that can interact with them, and it's usually pretty clearly written.
- acadapter 4y agoSomething similar to cigarette package warnings, like "this food interacts with many medications, please read the leaflets carefully".
- pydry 4y agoIt's weird how many people are seemingly against this. It's simple, cheap and will probably save lives.
- is_true 4y ago
- loonster 4y agoArrogance is an unfounded sense of one's abilities. My abilities are well founded.
- tsimionescu 4y agoIt is also enirely and completely useless. You would get desensitized to the warning the second or third time you buy grapefruit, and have 0% chance to remember the ubiquitous warning when you actually get some medication that does interact. The important thing is for your doctor to be aware, and notify you. Also, grapefruit is nowhere near the only food that can have terrible interactions with certain drugs.
- pydry 4y agoDesensitization doesnt matter. Grapefruit isnt an addictive drug. I learned about grapefruit's crazy drug interactions about 2 years ago once from an online article. Ever since then Ive been careful. I was entirely ignorant about them while buying grapefruits and juice for decades.
- ThrowawayR2 4y agoWell, ours is the profession from which "RTFM" arose as jargon (admittedly not without justification) so it doesn't seem that strange.
- bastawhiz 4y agoThis was literally the argument for Prop 65 warnings
- bastawhiz 4y agoI, for one, look forward to GMO grapefruit trees that produce fruit with the warnings already printed on the peel so that the millions of people globally that get their morning grapefruit fresh can know that there are a few dozen medications the fruit might interact with.
- sp332 4y agoMost foods don't have so many interactions with drugs. It wouldn't hurt to put a reminder on the grapefruit juice to check that stack of paper that came with your prescription to see if it's on the list.
- tsimionescu 4y agoNo one reads warnings more than a handful of times in their entire life.
- sokoloff 4y agoI take a medication for which grapefruit juice is contraindicated. I got no shortage of warning about from the medication side (doctor and pharmacist directly and verbally, plus in written form in the paperwork and labeling). It seems far more reasonable and feasible to put the warnings on the medicine than on the food.
- btilly 4y agoCounter point. Both I and my daughter are on unrelated medications that interact with grapefruit according to https://www.fda.gov/consumers/consumer-updates/grapefruit-juice-and-some-drugs-dont-mix https://www.fda.gov/consumers/consumer-updates/grapefruit-ju.... I remember no such warning for either of us. If you take medications regularly, I'd recommend checking out https://www.fda.gov/consumers/consumer-updates/grapefruit-juice-and-some-drugs-dont-mix https://www.fda.gov/consumers/consumer-updates/grapefruit-ju....
- svnt 4y agoThat’s not a counterpoint. It’s an anecdote, and an indication you need a better doctor.
- acadapter 4y agoAnecdotes like this, indicate that the current method of information isn't secure enough.
- svnt 4y agoYou mean reliable, not secure, but there are two checks you got and if you didn’t read the warnings it’s on you. This whole thing is so nanny-state I can’t believe I’m having this discussion here.
- sokoloff 4y agoIt’s not on the initial prescription filling paperwork AND not on the labeling on the container? My container has 5 warning/notice labels: Warning about interactions with pregnancy, grapefruit/grapefruit juice, alcohol, all other medications, and a description of the physical appearance of the pills.
- PeterisP 4y agoWould large leaflets attached to grapefruits be somehow read much more than large leaflets attached to drug packaging?
- eth0up 4y agoThe evil little bastards could be branded, with hot irons, right on their tender, conniving zests. It would serve them right. Or, when we soon switch to a CBDC with programmable credits, people who purchase prescription products could be prohibited from purchasing grapefruit products. Edit: I'm in favor of advancing awareness of the dangers of fresh and pasteurized fruit, not as proposed above, but in some effective way.
- traceroute66 4y agoAs the old saying goes, you can't fix stupid. By the time someone has killed themselves by eating grapefruit, it means they've already plunged through two safety barriers: 1) The medical professional that prescribed failed in their duty to inform of interactions (which then begs the question as to whether they also failed to screen for interactions before prescribing). 2) You know, those little bits of magically folded paper that come in every single packet of pills. They're not just there for decoration. And if you can't read, then there's always the Pharmacist (or friends or family). Its a bit like that stupid warning the Californians put on wine bottles that it may cause issues with pregnancies. Well, that warning is a bit short, because they should have also told you about cirrhosis of the liver, drink driving, the dangers of broken glass, the fact you might stain your carpet ....
- acadapter 4y agoThe problem is that it's not just "stupid" that creates problems. A warning would reduce the lethality of neglect and forgetfulness. The risks that come with grapefruit juice is much less obvious than the example with broken glass from the wine bottle.
- dewey 4y ago> A warning would reduce the lethality of neglect and forgetfulness. There's so many warnings and small print already. Just like terms of services and cookie banners on websites, nobody is reading them any more because we have warning fatigue.
- giantg2 4y ago"The risks that come with grapefruit juice is much less obvious than the example with broken glass from the wine bottle." Whoa there. Do you know about how impact to glass can create a crater on the inside of the bottle without shattering? Then you can end up eating or drinking the glass fragments that are in the food/drink. That's something that's not very obvious.
- aYsY4dDQ2NrcNzA 4y ago
- AreYouSirius 4y agoNO You can of course, but you obviously need to print it on grapefruit too, no ? Too much noise is bad even today. Try to about solutions which provide clarity and personalization. Medical professional should be responsible for your care, so he should provide you with link/printed brochure with comprehensive list of interactions for YOUR exact condition. it is more efficient and if something happens to you have piece of paper near you in your house with all interactions. You need personalization of everything.
- Test0129 4y agoIn America, for as long as I remember grapefruit juice interactions are both listed on the bottle and on the pamphlet you receive every single time you get a prescription (renewed or new). We can't put billboards up for everything. It is your health, and therefore your responsibility, to read the provided literature and raise any questions to your doctor. It's not obscured or hidden knowledge. In fact, it's usually one of the first things mentioned in big, bold text. In addition every pharmacy I've been to offers consulting on medications for free and in general doctors will always go over major interactions with medication (though I've had less luck with this).
- atkailash 4y ago
- t6jvcereio 4y ago> We can't put billboards up for everything. It is your health, and therefore your responsibility, to read the provided literature and raise any questions to your doctor I eat thousands of different things every week and I don't ask questions about any of them weekly. Do you? And would you think it's realistic to question everything all the time?
- NoOneNew 4y agoActually, yea. Many people do. It's relatively common. This is an element of personal responsibility. Granted, I know how to cook and I'm not a big fan of boxed, processed foods. This makes the gamut of foods I care about easier to track. Plus, knowing that grapefruit helps metabolize different things helpful and cheapens your bartab. You'll get drunk faster after eating a grapefruit or two. Animal derived fats help slow down the inebriation process, like butter and a really greasy beef patty.
- giaour 4y agoThis feels like the responsibility of the pharmacy more than that of the grocer who sold you juice. Pharmacies typically put stickers on medication bottles that say, “Do not take with grapefruit juice,” “Avoid sun exposure,” “Take with food,” etc. Would you want grocery stores to label grapefruits in the produce section?
- TheAceOfHearts 4y agoIMO, it would be perfectly reasonable to include a warning saying that grapefruit is known to interact with many medicines and should be taken with caution by medicated individuals. That's more likely to prompt someone who's medicated into looking up if their drugs are affected by the fruit. At worst, it causes a few companies to have to print an extra line of text and it gets disregarded by users.
- Test0129 4y agoWhy is it the grapefruit juice company's responsibility to let you know about your drug interactions? The cost to reprint labels is non-negligible and a tiny warning on the back is only going to be read by someone who ALSO reads their pamphlets with their medication. You're attempting to fix end user carelessness with bureaucracy which never works. Eventually this argument will move on to putting big bold warnings on the front of food, and then giant warning stickers like we do for cigarettes. At some point we have to allow people to have responsibility over their condition. Not only is the number of people affected by this small its also asinine. If it is a problem, make it a legal requirement to get drug counseling at the pharmacy before you can pick up your prescription. Otherwise it's a solution looking for a problem.
- dehrmann 4y agoSo on a grapefruit, rather than the standard PLU sticker, there's a jumbo one with a cigarette-style warning?
- acadapter 4y agoFor whole grapefruits sold by the kilogram or pound, there could be a sign next to the price.
- tsimionescu 4y agoDo you really think anyone would notice that warning after the third time they buy grapefruit their entire lives? Especially if the same warning appears on every common food that interacts with some common medication (for example, tea has potential bad interactions with SSRIs and other anti-depressants). This is 100% on your doctor, pharmacist, medicine producer, and yourself to check. Vague warnings on common foods would have 0 effect.
- samstave 4y agoYES!!!! They should. - My grandmother was an ER nurse her whole life (a candy-striper, etc, malpractice insurance investigations etc...) she was on some medications and grapefruit was a staple morning breakfast for my grandmother and grandfather... Grapefruit, a small sprinkle of either sugar or salt and a glass of O.J. - every morning for like 40 years.... Nearly killed her after she was on some medication that had a poor interaction with grapefruit. and these were medical experts! So, _YES_ EDIT: The point is: that even if youre a medical expert, you're still susceptible to this problem, and SHE WAS AWARE but the thing was that a medication she took at like 75 years old, was NOT properly warned about... Jeasus folks, even brilliant people miss shit like this at times.
- dehrmann 4y agoAre you sure she would have even see it? After eating grapefruit for 40 years, she'd become accustomed to ignoring the warning. She wouldn't have thought this warning suddenly applied to her.
- samstave 4y agoNew medications come to market and are not properly labled and the person in question who was a medical expert, was retired at the time - so she wasnt tracking product lit etc...
- sokoloff 4y agoHow would this new medication appear on the interaction label on all grapefruits/juice containers if your claim is that a medication itself made it all the way to market without the proper labeling on that very medication?
- tsimionescu 4y agoYes, and she would have seen the same warning on the grapefruit juice that she had been seeing for 40 years - which would have helped her not at all. Or do you think the warning would be kept up to date with the brand names (since many people don't know the substance names, of course) of the hundreds or thousands of medications that interact with grapefruit, and that people would periodically read that list? This is 100% on the doctor that prescribed the medication, a label on the juice or the fruit would do less than nothing, especially for people who consume it regularly.
- Ekaros 4y agoIf we start such warnings. What else should be covered? Alcohol by my understanding has interactions with those drugs that are broken down by liver at least. What should be threshold for warning to be present?
- acadapter 4y agoWe already have warning text for phenylalanine (for example in sweeteners, tonic, etc) and a list of allergens that must be stated.
- boredemployee 4y agoWell, I need to be on statins forever. No doctor ever told me about interaction between statins and grapefruit. I totally googled at random one day about grapefruit and cholesterol and tangentially it was mentioned (the dreadful interactions with statins).
- tsimionescu 4y agoDo you think a warning on a bottle of juice that you buy everyday saying "this may interact with certain medications" would have changed anything? I am 100% sure it wouldn't.
- boredemployee 4y agoI honestly don't know. And how could you be 100% sure? But knowing myself and how curious I am with these topics, if I read it on a bottle, I'd look around for sure. And since I'm daily taking these medications, until I die, would be wise to search for more information ofc.
- tsimionescu 4y agoI am 100% sure because I have seen how many warnings there are on the packages of many everyday items, and have never remembered a single one more than a day of two. And because I know I have never read the packaging of an item I buy more than once, with the exception of medication. I also know that this fact doesn't change when I do take medication. I don't suddenly start re-reading packaging on my milk to see if they have any warning about interacting with medications. Especially given how many different food items I buy every month that could have a generic warning.
- boredemployee 4y agoI genuinely would love to see data in that regard. I'm not a doctor or pharmacologist, but I'm very curious to know what exactly I'm taking into my body and what might happen and I'm sure I'm not alone.
- deleted 4y ago[deleted]
- User23 4y agoLeafy greens have drug interactions too, just to give another example. Ask your pharmacist about interactions with foods and supplements!
- myroon5 4y agodefensive and uncharitable comments.. Not common sense that grapefruit interacts with many meds. Signal to noise is important, but grapefruit interacts with enough to be notable. Someone would become aware that would've otherwise been ignorant: https://en.wikipedia.org/wiki/Defence_in_depth_(disambiguation) https://en.wikipedia.org/wiki/Defence_in_depth_(disambiguati... Even this thread itself raised some awareness, so thanks
- giantg2 4y agoThe real question is if this thread (or proposal) raised awareness that wouldn't otherwise occur for the target population via existing consultation and literature.
- tailspin2019 4y agoCompletely agree.
- tsimionescu 4y agoIf the prescribing physician is not informing you of important interactions and you are relying on random internet threads or food labeling (especially for food you normally consume) to notify you, then you are already doomed. Medicine, especially prescription medicine, often has terrible interactions with many commonly used substances. On the other hand, warning are useless when they are unspecific and appear on something you regularly consume. You will at best notice a warning label on a package 2-3 times in your entire life, assuming you use that regularly, and even then you will immediately forget unless it is very specific to you (such as a peanut warning for someone with a peanut allergy).
- amluto 4y agoI think a more interesting question would be: should food that contains grapefruit have a warning? Any food with high levels of phenylalanine says “phenylketonurics: contains phenylalanine”. Perhaps food containing substantial amounts of grapefruit should carry a similar warning. This is complicated by the fact that other citrus fruits may have similar interactions and, at least according to Wikipedia, the full set of problematic citrus fruits is not well characterized.
- daviross 4y agoI've run into a variant of this: Beer. Citrus is a popular adjunct flavoring for IPAs and other hopped beers. Sometimes it's obvious, a grapefruit shandy is going to have grapefruit in it; but I've also had beers labeled something like Orange Citra Juice Bomb where down in the ingredients it notes that the citrus flavor is boosted by grapefruit, but I didn't catch that. Now, that's partially on me for not scrutinizing the ingredients, but also *beer doesn't have to list ingredients*. So it's entirely possible to have a beer containing a significant amount of grapefruit without any indication of it on the label. And that can be life-threatening, depending on the medication in question. So that's something where I'd definitely appreciate a standard of noting grapefruit if it's in a food. Activated charcoal similarly.
- acadapter 4y agoYes, of course there should be warnings for other citrus hybrids that produce the same chemical. But there is a limitation for HN thread titles, I had to keep the question simple.
- amluto 4y agoI don’t mean other fruit. I mean prepared foods that contain citrus.
- sterlind 4y agoPSA: don't stop drinking grapefruit juice abruptly, if you are on meds. your effective dosage of medication will swing wildly as your liver enzymes adjust. this has killed people before - someone will be on a carefully titrated dose of heart meds, stop consuming grapefruit, and die from their body suddenly having 3x more/less of their med.
- c7DJTLrn 4y agoOr just ask a doctor. There shouldn't be guesswork involved.
- giantg2 4y agoThere are numerous interactions and precautions for most medications. The riskier ones are prescribed, and doctors (and pharmacists) should be going over the risks and interactions. The less risky (or grandfathered, or politically motivated) are available over the counter, and it's important to read the literature that comes with it. If people can't reasonably read or understand the risks and interactions, then that medication should be prescription.
- swatcoder 4y agoSomeone prescribed a medicine is given given direction by the doctor, a consult from their pharmacist, and printed material explaining how to take their medication and what to be careful of while taking it. More information is available to them online and in popular home reference books for drugs. Perhaps because of a life too inundated by data, or because they’re busy, or for whatever reason, they ignore all of these opportunities to understand the medicine they’ve been asked to take. I can’t judge a person for doing that, as I’m sure I’ve done the same thing, but I certainly wouldn’t expect a new label on a jug of grapefruit juice that they barely glance at to finally make it across the finish line! There are problems in the world that are just going to exist, and efforts to eradicate them can become costly and fruitless nuisances rather than further solutions. This feels like one of those to me.
- tailspin2019 4y ago> Someone prescribed a medicine is given given direction by the doctor, a consult from their pharmacist, and printed material explaining how to take their medication and what to be careful of while taking it. I don’t know what the healthcare system is like where you live but based on my experience in the UK, the only reliable one of these three sources that I’ve experienced is the printed material. Doctors and pharmacists, for whatever reason, have not proved to be a good source for anything but the most basic of information (if any) about prescribed medicine. And that printed material is so broad that they list every possible side effect and contraindication under the sun. Presumably for sufficient legal cover for the pharmaceutical company.
- tsimionescu 4y agoAnd you think a warning on a grapefruit juice bottle that you buy everyday would do better? Especially one that, by force of space, says "ask your pharmacist if any medicine you take may interact with this"?
- tailspin2019 4y agoI don’t have an opinion on that. I was replying to the parent (about sources of information) with my specific experience.
- deleted 4y ago[deleted]
- svnt 4y agoGrapefruit is a food that alone or with other foods poses basically no risk. Medications have all kinds of complex interactions. The vitamin K from any number of leafy greens in conjunction with prescription meds can kill you too. If you are tuned within an inch of your life on prescription meds maybe you should read the leaflets. Warnings on citrus fruit. What.
- DoreenMichele 4y agoNo. The medicine comes with a warning label.
- tatajupng 4y agoGrapefruit juice has been thought to increase the effects of some drugs for some time. You can find many "recipes" of certain drugs taken with grapefruit juice on trip reports on Erowid.
- aYsY4dDQ2NrcNzA 4y agoKnown to.
- eurasiantiger 4y agoA more relevant move would be to add warnings about monoamine oxidase inhibitors to various items that contain them, from coffee to tobacco. You can’t avoid what isn’t on the packaging.
- skmurphy 4y agoThe question is what is the level of risk you are trying to prevent. For me a far more underappreciated risk is the level of liver toxicity in acetaminophen (Tylenol) especially with even moderate amounts of alcohol--taking Tylenol for a hangover is a very bad idea. You can be in liver failure (See https://www.mayoclinic.org/diseases-conditions/acute-liver-failure/symptoms-causes/syc-20352863 https://www.mayoclinic.org/diseases-conditions/acute-liver-f... ) after one very large dose of acetaminophen, or after higher than recommended doses every day for several days. From https://www.ucihealth.org/blog/2018/03/acetaminophen-liver-failure https://www.ucihealth.org/blog/2018/03/acetaminophen-liver-f... About 1,600 U.S. cases of acute liver failure occur each year due to acetaminophen overuse. And some 500 people die each year from overdosing on the drug.
- sokoloff 4y agoEstimates are that half of those deaths are suicide. (That doesn’t mean the drug’s side-effect-free, but does mean labeling likely wouldn’t be effective.)
- skmurphy 4y agoIf labeling efforts cut the death rate in half that's 249 more people a year who are saved vs. "grapefruit deaths." The trick is to aim for improvement not perfection. We could limit deaths more by banning Tylenol but that would lead to other problems that might be equally serious (e.g. more opioid use for pain relief).
- sokoloff 4y agoWhat level of additional labeling will eliminate non-intentional ODs? There’s clear dosage instructions already, including “do not exceed” levels.
- skmurphy 4y agoI used acetaminophen as an example of drug that is killing many more people than grapefruit juice. It's possible we could take a more holistic look and see where else we could minimize unintentional overdoses and dangerous interactions. The question is what additional measures would reduce--for example, cut in half--the current level of unintentional overdoses and drug interactions that cause liver failure. What the doctors call polypharmacy and regular people call "grandma has a big bag of pills to take each day" is a serious problem for folks over 65 to pick a different aspect of the same challenge. In my experience you will get nowhere if you will only explore interventions that "eliminate problems." Reduction in harm for effort and money invested is a better standard.
- rmk 4y agoGrapefruit will be mentioned in the ingredient list if it's present in significant amounts. Many allergens, such as peanuts, which can cause severe anaphylactic reactions and can affect many people, are prominently mentioned, including if the facility that produces a product also deals with them. Beyond that, it's really on the consumer of food to make sure they are not ingesting anything that can cause harm to them. Ascertaining grapefruit presence in the food falls squarely in this category. If you can not be sure that grapefruit is absent in a juice, do not drink it. It's that simple. And if something says grapefruit prominently on the packaging (I imagine grapefruit juice in its original packaging would certainly fit the bill), then it's really the individual's responsibility.
- timbit42 4y agoCBD does the same as grapefruit. I don't know if it affects all the same medicines but I'm on a med affected by grapefruit and found out CBD has the same effect and my pharmacist confirmed what I found.
- kurupt213 4y agoThe Medicines should be labeled
- exabrial 4y agoNo: it’s in the documentation of your medicine. Stop the shroud warning labels on everything that keep increasing consumer product prices
- smittywerben 4y agoWhy stop at grapefruit juice? I've heard citrus juice can have unpredictable effects on any drug. Imagine you have a peanut allergy and have to check the labels on everything to see if it contains peanut or processed in a plant with peanuts. Then you walk into the drinks aisle and see grapefruit juice box with a big red banner WARNING THIS PRODUCT CONTAINS GRAPEFRUIT JUICE.