The first non-opoid painkiller
105 comments
·June 26, 2025ggm
billforsternz
Off topic complaint: I am guessing an absolutely massive amount of (admittedly minor in each instance) grief has been caused by the most widely deployed simple, inexpensive, useful and familiar drug unnecessarily having two different names acetaminophen / paracetamol. Finally figured this out this year (aged 64) after previously being confused why I couldn't find any damn paracetamol in pharmacies on my occasional visits to the US.
theoreticalmal
My wife and I got colds while vacationing in Edinburgh and had a heck of a time before realizing to ask for paracetamol rather than acetaminophen. Also, the rules the UK has for limiting paracetamol purchases to small amount per day are so fantastically stupid.
stavros
True, but paracetamol overdoses are not a fun death. Granted, you need to take a massive amount, but still.
closewith
> Also, the rules the UK has for limiting paracetamol purchases to small amount per day are so fantastically stupid.
Yes, but:
> Responsible for 56,000 emergency department visits and 2600 hospitalizations, acetaminophen poisoning causes 500 deaths annually in the United States. Notably, around 50% of these poisonings are unintentional, often resulting from patients misinterpreting dosing instructions or unknowingly consuming multiple acetaminophen-containing products.
Source: https://www.ncbi.nlm.nih.gov/books/NBK441917/#:~:text=Acetam...
bgeeek
I have a few prescription medications that are called different things in the US. I thought it was fairly common knowledge with paracetamol, though. Tylenol being one of the common brands names.
closewith
Paracetamol is the standard and WHO approved name used everywhere except certain parts of the US. It's ridiculous the FDA chose acetaminophen.
privatelypublic
Don't forget people like to call it APAP too.
xeeeeeeeeeeenu
>It's the first non opioid painkiller applicable for situations like post operative use.
Perhaps the first approved by FDA, I don't know. In many countries, metamizole is the first-line drug for postoperative pain.
(It should be noted that metamizole may very rarely cause agranulocytosis. It is suspected that the risk varies depending on the genetic makeup of the population, which would explain why it is banned in some countries but available OTC in others.)
arthur2e5
From my limited experience of metamizole it feels a bit stronger than paracetamol/acetaminophen. Neat little drug if your genetics can take it.
Tangential: China technically banned metamizole due to the agranulocytosis scare, but somehow small clinics always have fresh stocks of this stuff. And their stocks don't look like my metamizole for horses! It's pressed out of the usual magnesium stearate instead of whatever rock-hard thing they use for animal drugs in China.
arethuza
I broke a tooth because of kidney stones...
I had kidney stones last year, by far the most painful thing I have experienced, and got opioid based painkillers which made me constipated. To try and fix that I was eating some stoned prunes and it turns out one of them wasn't stoned and I damaged a tooth (it was weak anyway and needed replacement with an implant).
PaulHoule
Breaking news: turns out acetaminophen has an active metabolite that acts on... sodium channels.
https://medicalxpress.com/news/2025-06-acetaminophen-discove...
arthur2e5
AM404 really is the metabolite that keeps giving. The central nervous system system effects were fun too, acting on cannabinoid receptors and/or TRPV1 channels -- so either stony or spicy.
PaulHoule
I can't say it ever made me feel high, but acetaminophen has been long shown to have significant behavioral effects
https://pubmed.ncbi.nlm.nih.gov/27217114/
https://pubmed.ncbi.nlm.nih.gov/32888031/
My primary care doc doesn't want me taking either NSAIDS or acetaminophen so when I get asked at the urgent care what I take for pain I say "Nothing".
nick__m
I received Ketorolac after a tooth replacement (airbags packs a good punch) and it was more effective than the 5mg baby sized morphine pills they prescribe nowadays.
It's a NSAIDs but it's not to hard on the stomach but it's somewhat hard on the kidneys. However Ketorolac is a dangerous drug if you don't follow the posology (don't take 2 pills at the same time, the therapeutic index is that narrow) or if your a poor metaboliser, it leads to kindey failure, stomach bleeding and other life threatening side effects. I would be surprised if that new pain killer was superior to this.
I am sure it's less dangerous but more effective I really doubt it.
johnisgood
Opioid-induced constipation is easy to counteract, however, with the right form of magnesium, and/or laxatives. There are herbs that you could drink as a tea, too, for constipation.
If you ask me whether I choose pain or constipation, well, I am pretty sure you know the answer.
This constipation goes away once you stop, and everything depends on the dose and the frequency and duration of taking it.
rob74
I would certainly consider ibuprofen a "painkiller", it works wonders when I get a headache. So the phrase "the first non-opioid pain reliever suitable for treating post-surgery pain" used later in the article should actually have been the title IMHO...
wtcactus
Interesting that for me ibuprofen doesn’t do absolutely anything (and I’m someone that avoided painkillers almost all my life) I take 1g pills and nothing.
Well, not nothing, my stomach clearly doesn’t like it and I feel it.
Human pain and painkillers response seems extremely variable across different subjects.
amalcon
There are also local anesthetics like the lidocaine family. Some of those are usable for post operative pain in the very short term, but obviously can't be administered orally. That presents a problem for most surgeries, since either they'll want to send the patient home or it's located somewhere that's hard to inject.
OJFord
I think a better title here than:
> The first non-opoid [sic] painkiller
might be:
> The first non-opioid nociceptive pain-killer
Nociceptive pain being that by actual damage to tissue, as opposed to neuropathic pain like a headache or inflammation that you might take a (non-opioid!) NSAID for.
biofox
I'm a neuroscientist by training, and that doesn't match my understanding (although the definitions might have changed).
Inflammation would be an instance of nociceptive pain, and an NSAID would alleviate it by reducing the inflammation; and most tissue damage will result in inflammation.
Neuropathic pain, on the other hand, would be due to damage of the nerves themselves, and NSAIDs are completely useless here (ask anyone with sciatica or other nerve entrapment)
OJFord
I'm happy to take that correction - I have no training in any relevant field - I was just trying to follow the description in TFA, which links indirectly to my link above in the second paragraph or so as 'nociceptive pain'; from which I inferred that's all it's talking about and existing non-opioids must therefore not target that.
Perhaps non-inflammatory (or generically) nociceptive pain killing is the point. (Which is getting a bit specific for such a broad title isn't it. Does 'painkiller' ordinarily have such a narrow meaning in your experience?)
EasyMark
I guess that would make sense in a scientific paper or journal, but most people would have no idea what that means and just make for a confusing title that would turn people off from reading it. Almost everyone has heard of opiates in the evening news or social media.
OJFord
And almost all those people have 'painkillers' such as paracetamol and ibuprofen in their cupboard, which they know not to be opiates.
The point isn't to accurately describe it as 'nociceptive' (which I've never heard of before either) and have that be understood, it's to qualify it such that it isn't confusing or sounding like an historical tale of how whatever the first NSAID/analgesic was came to be.
badmintonbaseba
Also everyone heard of pain killers that are non-opioid, so you can't really get around explaining why this one is novel.
szszrk
Will that terminology explanation be a subtitle? :)
OJFord
Well my comment will still be here, and at least having the qualifier in the title is a pointer to look it up if needed, or to hint 'oh right ok it doesn't mean of all things, I guess paracetamol does not kill nociceptive pain, whatever that is'.
null
perching_aix
> Another example involves nerve growth factor inhibitors like tanezumab. Although tanezumab alleviated inflammatory pain from conditions like osteoarthritis, Phase III trials revealed an unfortunate side effect: rapidly progressive osteoarthritis. Researchers hypothesized that because patients felt so much better, they overused their arthritic joints, accelerating damage. Although further trials were conducted at lower doses and with restrictions, the FDA ultimately voted against its approval.
Really not sure how to feel about this part lol, I mean I get it, but at the same time this is very ugh.
dakial1
Well, pain exists for a reason for animals to pay attention to things that are harming the body.
If you remove the flag (pain), harm will continue.
mrweasel
That's a very real concern. A friend of mine has a higher than normal threshold for pain and have permanent injuries as a result. Among other things has walked around on a broken foot for months and failed to register a back injury. All of this then escalated to the point where she feels the pain, but the injuries have become permanent.
Karawebnetwork
I have a similar condition. For me, the issue isn't so much the sensation of the permanent injuries themselves, but rather the constant physical fatigue that comes with them. Since doctors tend to rely heavily on those 1-to-10 pain scales with the little face expressions, it's incredibly hard to be taken seriously when your symptoms don't fit neatly into that system. What's frustrating is that people who can feel the pain early on often have a chance to prevent further damage. I couldn't and doctors couldn't even help me identify that I might have health issues.
I worry a lot about aging, and I'm also afraid of things like tumors or cancers that I might not feel until it's too late. As an example, I can't feel cavities forming and I didn't even notice my wisdom teeth piercing through my gums when I was a teen.
perching_aix
Sure, it just feels like an incomplete justification to completely prevent a drug from entering the market and being used. Also, that was just the hypothesized mechanism at play, it may not have been what was actually happening, which is the other "ugh" part to this.
That said, the article may not be fairly representing what happened in the first place, so...
jjulius
>Sure, it just feels like an incomplete justification to completely prevent a drug from entering the market and being used.
Clicking "FDA" in the bit you quoted above takes you to a different page wherein the FDA laments the lack of data around the drug (eg, the "hypothesized mechanism"). It also suggests that the companies intend to work with the FDA more on this.
Was the vote against approval a move to "completely prevent a drug from entering the market and being used", or was it a desire to better understand it before saying "okay"?
esperent
> Also, that was just the hypothesized mechanism at play, it may not have been what was actually happening
The more I learn about pharmacology, the more I realize this is the norm, rather than the exception.
IrishTechie
In that case maybe, but there are plenty of cases where pain is not indicating harm and may actually prevent people from reducing harm.
DebtDeflation
Meanwhile, good old aspirin is not only an effective pain reliever but it has also been shown to reverse the effect of cartilage loss in osteoarthritis:
https://www.sciencedirect.com/science/article/abs/pii/S03785...
And that's not even taking into account its cardioprotective effects.
But hey, it can be hard on the stomach in SOME people so we developed alternatives with all sorts of nasty side effects, up to and including heart attacks and strokes (rofecoxib, valdecoxib, etc.) Hell, a decade ago, the FDA issued an advisory across the board that "Non-aspirin NSAIDS increase the risk of heart attacks and strokes":
https://www.fda.gov/drugs/drug-safety-and-availability/fda-d...
Some day we will look back on the attempted replacement of aspirin with these other drugs the same way we now look back on the replacement of butter with margarine (and the replacement of saturated fats with trans fats more broadly).
lr4444lr
The FDA interfering with informed consent between doctor and patient isn't something I find a source of complex feelings.
The agency bears zero responsibility for the pain and suffering its caused by overcaution.
ta20240528
> The FDA interfering with informed consent between doctor and patient isn't something I find a source of complex feelings.
Thalidomide.
Patients (and often doctors) really don't have the skills or information to make an informed decision.
They can however have 'feelings'. This is not the same thing.
eej71
I think your argument hinges on the implied idea that whoever makes up these entities (the FDA or otherwise) are intrinsically made of finer clay that the rest of us mere mortals.
EasyMark
maybe they could lower the dosage in future studies? I'm sure they've considered that though and will take it into account.
pentaphobe
Interesting that the author chose that title despite the existence of NSAIDS [^1] and paracetamol(acetaminophen) - the latter of which they even mention (but only in the context of combination with opioids)
Did I miss something?
EDIT: answered in sibling post, thanks @ggm!
[1]: Non Steroidal Anti-Inflammatory Drugs
shakna
The title... Confuses me. Especially with a handful on non-opiod painkillers sitting in my history. Gabapentin? Heck, ibuprofen?
Especially when the article itself compares it to ibuprofen:
> If paracetamol and ibuprofen are inadequate for pain relief, Journavx can now be prescribed as the next alternative treatment, instead of mild- to moderate-strength opioids.
"suitable for treating post-surgery pain" isn't something to cut, just for a better title. It just makes the clickbait stench of that first line even worse.
This is a better paracetamol. Which is awesome, and something we need. This is not a world first.
lopis
Gabapentin is an anticonvulsants. Ibuprofen and paracetamol are anti-inflammatory. While they are effective at reducing pain, they are technically not "pain killers". The title is therefore correct.
cheshire_cat
This news article claims that the results of the Phase II trials where not great?
https://www.painnewsnetwork.org/stories/2024/12/23/more-lack...
As someone else already mentioned in this thread, in Europe there is already metamizole which is used for post-surgery pain. Anyone knows if suzetrigine is more effective than metamizole?
Perenti
The paragraph on the relation to Brugada Syndrome hits home, as I have that rare disease. What isn't clear is if it's safe for Brugada patients - a hell of a lot of drugs are not advisable for us. As I also have CRPS type II (complex regional pain syndrome) I'd like a non-narcotic strong pain killer that doesn't induce arrhythmia.
Snoozus
This is clickbait, there are at least two classes of non opioid painkillers in use since a long time. https://en.wikipedia.org/wiki/Analgesic
gorjusborg
I don't feel the title is misleading, but it may be a cultural language difference.
The term 'painkiller' is reserved for strong pain relief, and wouldn't include things like ibuprofen. That made me think immediately of a non-opioid pain blocker not just a pain reliever.
pbhjpbhj
>The term 'painkiller' is reserved for strong pain relief
Having claimed it was cultural. It have been helpful of you indicated which culture you felt this applied to.
In UK I'd say painkillers includes ibuprofen and paracetamol. I suppose with ibuprofen it's also referred to as an anti-inflammatory. Not sure how else one would refer to paracetamol other than with synonyms (analgesics) or euphemism (pain relief tablet).
dcminter
Even in the UK it's not necessarily true. I wouldn't be surprised to hear it used that way, but I don't think my peer group in the UK would ever refer to NSAIDs as anything other than their brand or generic names.
I particularly disagree with the parent comment that calls this click bait. The topic's intrinsically interesting to anybody who'd be lured in by that title; it doesn't need "bait" and we all know NSAIDs exist.
The article's particularly good at citing its references inline, which I very much appreciated. Added this author to my RSS reader in fact.
Eavolution
Paracetamol can be referred to as an antipyretic (fever reducing drug), and it's widely used for that in the same way ibuprofen is used as an anti inflammatory.
nemo
>The term 'painkiller' is reserved for strong pain relief
Maybe there's some very specific, limited medical context where this is the case but in common parlance it's not at all the case, search for "painkiller" in an online shop like Amazon and you'll find a whole lot of Paracetamol/Tylenol, and various NSAIDs (aspirin/ibuprofen) and manufacturers of those drugs actually use that specific term.
perching_aix
Can you explain what the difference is? Would pain-relievers be substances that undo whatever is causing the pain, making them indirect, while painkillers act directly on the pain signals and their transmission?
petesergeant
> The term 'painkiller' is reserved for strong pain relief,
In which dialect of English do you think this is true?
EasyMark
It might be clickbait, but it's also pretty big news of a fairly universal topic and not in the vein of "This one secret that your doctor doesn't want to know!"
pcthrowaway
I'm always surprised that Kratom (https://en.wikipedia.org/wiki/Mitragyna_speciosa) doesn't come up more in these conversations. In addition to being a powerful painkiller, it helps manage opioid withdrawals.
I believe it's still somewhat legal for consumption in the U.S., though other countries have been moving to ban it to varying degrees, since it can be used recreationally, though it isn't known to produce the same intensity of euphoria as opioids, and can also be addictive, though I don't believe it to produce as severe withdrawals as opioids.
All in all I think it's a sadly understudied and underutilized medicine, which is the unsurprising result of pharmaceutical companies having less incentive to study plant medicines
ChrisMarshallNY
We'll have to see how this pans out, once people start getting it prescribed.
If you want to see what a "non-addictive" painkiller is like, watch Dopesick.
Y_Y
Other comments have mentioned NSAIDs, but also there's nitrous oxide, ethanol, meditation, etc.
This is a silly headline.
croemer
It should have "suitable for treating post-surgery pain" added to it - that qualification is in the body of the article.
echelon_musk
> Traditional opioids mimic opium, a compound found in the poppy plant that contains morphine.
Huh? How can a compound contain another compound. I thought opium was the term for an extract which contained opiates (compounds) and not the other way round.
mrob
Two different meanings of the word. The article is using the traditional non-scientific meaning. Opium is a compound (as in a mixture), containing several different chemical compounds (as in molecules containing more than one element).
dudeinjapan
In the original sentence, "contains morphine" is probably modifying "compound", not “poppy plant”
---
"Opium" is the dried latex (milky fluid) that comes from the seed capsules of the opium poppy (Papaver somniferum).
Opium contains ~12% morphine, ~2.5% codeine, and ~1.5% thebaine, all of which are analgesic alkaloids that act on the μ-opioid receptors. So opium itself is a cocktail of these, plus non-analgesics like noscapine (a cough suppressant) and papaverine (a vasodilator.)
Heroin is synthesized from morphine by acetylation.
Oxycodone is synthesized from thebaine in a more complex, multi-step process.
As for the terms "opiate" vs. "opioid", the terms are sometimes used interchangeably but "opiate" generally refers to naturally occurring chemical (morphine, codiene, thebaine, etc.) while "opioid" is a catch-all Heroin is often lumped in with the opiates since it is a simple synthesis; oxycodone could be called a "semi-synthetic" opioid, and fully synthetic opioids include fentanyl, methadone, and tramadol. Relative to morphine, codeine is about 1/10th the potency, heroin is 4x, fentanyl is 50-100x, and the veterinary analgesic carfentanil (given to elephants and rhinos) is 10,000x--yikes!
bravesoul2
This sentence confused me too!
Colloquially acetaminophen/paracetamol and ibuprofen are "painkillers" but this is in a different class, it's amazing to have something which performs like the opioid pain relief but without at least some of the side effects.
It's the first non opioid painkiller applicable for situations like post operative use.
I'd have loved this after my hernia op, the last thing you need with that is opioid induced constipation.