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Practice · Interactions · continued

Coming back to: Delayed gastric emptying and oral medication absorption: which drugs matter posts 31–60

This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1 · go to the accepted answer.

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m.adebayoTL216 Jul 2026#31

The practical advice most consistently given by pharmacists here is to keep the timing of other oral medication consistent rather than to change it, because consistency is what makes a problem visible.

The mechanism is plausible, which is not the same as established.

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l.chevalierTL3Regular16 Jul 2026#32

No notes. Posting so the count is not one.

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t.batistaTL216 Jul 2026#33
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bench_peakTL3Regular17 Jul 2026#34

Post #30 and I disagree about the size of the effect, not about the direction.

A methods point on Delayed gastric emptying and oral rather than a substantive one: if the comparison is not like for like, the difference you are measuring is the difference in method.

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RC
r.chukwuTL217 Jul 2026#35

Narrowing post #34, because the general version has more than one answer.

Where a published interaction study exists it usually reports an area-under-curve ratio, and that number is far more informative than a yes-or-no answer.

The confident version of this sentence would be wrong, so here is the hedged one.

1 like 11d
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BramleyTL2Member17 Jul 2026#36

Oral medications with a narrow therapeutic index are the ones where that matters most. The interaction is about rate and timing rather than about the total absorbed, in most published cases.

I would be glad to be shown a cleaner way of putting this.

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PB
p.boatengTL217 Jul 2026 · edited#37
l.pires, post #15: Confirming post #14 from a second method, which matters more than confirming it from a second person. Delayed gastric emptying is the mechanism behind most of the plausible interactions in this class: anything whose absorption depends on how quickly the stomach empties can behave differently. I would hold that lightly until someone with… Go to post

I have no financial interest in anything named in this thread and I want to say so before I comment on Delayed gastric emptying and oral, because it is the sort of subject where it matters.

17 likes in reply to #15 10d
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TavaresTL1Member18 Jul 2026#38

Post #34 put the caveat in the right place and I want to underline it.

Anticoagulant questions come up regularly and are the clearest case for professional advice rather than discussion, because the consequence of being wrong is not gradual.

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k.kuuselaTL218 Jul 2026#39

I would call the community position on Delayed gastric emptying and oral likely rather than established, and I would be comfortable defending that hedge.

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footnote_entryTL3Regular18 Jul 2026#40

Answering the question post #38 raises rather than the one it answers.

One more thing on Delayed gastric emptying and oral that took me far too long to see: the two figures people quote are not measuring the same quantity. Once you notice that, the apparent contradiction disappears.

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a.villalobosTL219 Jul 2026#41
r.chukwu, post #35: Narrowing post #34, because the general version has more than one answer. Where a published interaction study exists it usually reports an area-under-curve ratio, and that number is far more informative than a yes-or-no answer. The confident version of this sentence would be wrong, so here is the hedged one. Go to post

Separation timing versus clinically important interaction: a separation timing inconvenience (taking one medication 2 hours before or after another) is not the same as a clinically important interaction. Both can reduce absorption of one or the other, but only true interactions require active management.

I am not the right person to answer the follow-up to this.

13 likes in reply to #35 9d
TF
taper_fileTL3Regular19 Jul 2026#42
taper_table, post #27: Helpful, and easy to find again, which is half of what a good reply is. Go to post

Post #39 is right about the mechanism and I think understates the practical bit.

Timing separation is the standard mitigation where absorption rate is the concern, and the interval that matters depends on the other drug rather than on this one.

4 likes in reply to #27 9d
HK
h.krastevTL219 Jul 2026#43

Summarising the Delayed gastric emptying and oral thread so far, since it is long and the answer is buried: the first reply has the method, the fourth has the correction to it, and the rest is people agreeing at length.

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DKwiatkowskiTL3Regular19 Jul 2026#44

Delayed gastric emptying and oral is a question about a distribution, not about a value, and treating it as a value is what produces the confident wrong answers.

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am.wikstromTL220 Jul 2026#45
h.krastev, post #43: Summarising the Delayed gastric emptying and oral thread so far, since it is long and the answer is buried: the first reply has the method, the fourth has the correction to it, and the rest is people agreeing at length. Go to post

I had written a reply contradicting post #43 and deleted it. Here is what survived.

The most defensible general position in this subcategory: identify the plausible mechanism, check whether it has been studied, and where it has not, say that rather than filling the gap.

19 likes in reply to #43 8d
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baseline_tableTL220 Jul 2026#46
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a.molnarTL220 Jul 2026#47

Alcohol is not contraindicated in the labelling and it does irritate a stomach that is already emptying slowly. There is no published interaction study, and the conservative reading is the obvious one.

Stating my assumptions rather than smuggling them in.

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DSakamotoTL3Regular20 Jul 2026#48

Delayed gastric emptying is the mechanism behind most of the plausible interactions in this class: anything whose absorption depends on how quickly the stomach empties can behave differently.

One case, stated as one case.

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w.verhoevenTL221 Jul 2026#49
k.agyeman, post #4: The practical advice most consistently given by pharmacists here is to keep the timing of other oral medication consistent rather than to change it, because consistency is what makes a problem visible. Go to post

I read post #47 twice before replying, because I had assumed the opposite.

The honest answer on Delayed gastric emptying and oral is that it depends, and the useful part is the list of what it depends on. Four items, in rough order of how much they matter.

Most people get the first two right and then argue about the fourth.

26 likes in reply to #4 7d
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aliquot_lineTL3Regular21 Jul 2026#50

Checked the Delayed gastric emptying and oral claim against the primary source this morning. It survives, with a narrower scope than the version quoted here. Posting the narrower scope.

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n.kravchenkoTL221 Jul 2026#51

Post #50 is the version of this I will quote in future. One addition.

Food interactions: most interactions are absorption interactions. Some medications absorb better with food, others better on an empty stomach. With an incretin agonist that already slows gastric emptying, food effects interact with the drug effect as well.

That holds under the stated conditions and I have stated them.

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slow_titratorTL2Regular21 Jul 2026#52

Grateful for the specificity. Vague answers to this question are what sent me looking.

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h.espinozaTL222 Jul 2026 · edited#53

Delayed gastric emptying and oral was covered in the wiki last year and the page has a review date on it, which is a better starting point than my memory of a thread.

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y.mensahTL3Wiki editor22 Jul 2026#54
Bramley, post #36: Oral medications with a narrow therapeutic index are the ones where that matters most. The interaction is about rate and timing rather than about the total absorbed, in most published cases. I would be glad to be shown a cleaner way of putting this. Go to post

The number people quote for Delayed gastric emptying and oral is a central estimate presented without its interval, and the interval is wide enough that the estimate is nearly uninformative on its own.

9 likes in reply to #36 6d
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j.falkTL222 Jul 2026#55
ni.stanescu, post #6: Alcohol is not contraindicated in the labelling and it does irritate a stomach that is already emptying slowly. There is no published interaction study, and the conservative reading is the obvious one. I would want to see it done twice before believing it once. Go to post

Confirming post #54 from a second method, which matters more than confirming it from a second person.

The most defensible general position in this subcategory: identify the plausible mechanism, check whether it has been studied, and where it has not, say that rather than filling the gap.

If it helps: the failure mode here is usually boring rather than dramatic.

14 likes in reply to #6 6d
BJ
b.jankowiakTL3Regular22 Jul 2026#56

On Delayed gastric emptying and oral, I would rather understate and be corrected upward than overstate and be quoted. That is a house style here and it is a good one.

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IW
i.wojcikTL223 Jul 2026#57

Whatever the answer on Delayed gastric emptying and oral turns out to be, the method for getting there is the same: state the assumption, do the arithmetic in public, invite the correction.

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bench_entryTL3Regular23 Jul 2026#58

Post #56 describes the usual case. This is about the unusual one.

Oral contraceptive absorption has been studied specifically for some compounds in this class and the findings are compound-specific. Generalising from one to another is not supported.

I have changed my mind on this once already, so take it as current rather than settled.

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NB
n.brobergTL223 Jul 2026#59
mira.patel, post #12: Delayed gastric emptying and oral has a well-known answer and a correct answer, and the interesting work is establishing that they are the same. Nobody has done that here yet. Go to post

Post #58 is right about the mechanism and I think understates the practical bit.

One caution on Delayed gastric emptying and oral: everything above assumes the underlying documentation is what it claims to be. That assumption is doing real work and is rarely stated.

0 likes in reply to #12 5d
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orbitrap_olaTL3Mass spectrometrist23 Jul 2026#60

I have been on both sides of the Delayed gastric emptying and oral argument in this category within eighteen months, which should tell you how strong the evidence for either side is.

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