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Practice · Interactions · continued

Antibiotics and a course of something with delayed emptying posts 61–90

This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1.

MA
m.agyemanTL29 Jun 2025#61

Where I part company with post #59, and it is a narrow parting.

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.

5 likes 14mo
TT
taper_tableTL3Regular11 Jun 2025#62

Reading this antibiotics thread as someone who came in with a fixed view: the third and seventh replies moved me and the confident ones did not.

0 likes 14mo
PO
pe.onwukaTL212 Jun 2025#63

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

28 likes 14mo
AR
ambient_reviewTL3Regular13 Jun 2025#64

Adding the measurement that post #63 says would settle 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.

The disagreement above is smaller than it looks once the terms are fixed.

14 likes 13mo
EM
e.mensaTL214 Jun 2025#65

Post #63 put the caveat in the right place and I want to underline it.

Filing a mild objection to the consensus on antibiotics. Mild because I might be wrong; an objection because nobody has addressed the case that does not fit.

2 likes 13mo
VD
vial_deskTL3Regular15 Jun 2025#66

Thank you for the correction. I would rather find out here than later.

0 likes 13mo
TT
t.tullochTL217 Jun 2025 · edited#67
taper_table, post #1: Antibiotics and a course of something with delayed emptying — setting out what I have, and where I think it stops being reliable. Something about antibiotics does not reconcile and I would like a second pair of eyes before I decide which half is wrong. Two sources, both reputable, giving figures that cannot both be right unless they are… Go to post

A pharmacist can answer most questions in this subcategory in a few minutes with access to a proper interaction database, and that access is the thing a forum does not have.

The strength of my opinion here exceeds the strength of my evidence.

21 likes in reply to #1 13mo
B
BBramleyTL3Regular18 Jun 2025#68
ma.nascimento, post #54: 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. Adding the caveat now so it does not have to be extracted later. Go to post

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.

If that is already documented somewhere, ignore me and link it.

9 likes in reply to #54 13mo
GE
g.ekstromTL219 Jun 2025#69

The thing about antibiotics that took me longest to accept is that a plausible mechanism is not evidence of an effect. It is a reason to look, not a result.

0 likes 13mo
L
LeitermanTL3Regular20 Jun 2025#70
OFalkenberg, post #10: Source for the antibiotics figure, since it was asked for. It is in the discussion rather than the abstract, which is why the version circulating is stronger than the paper is. Reading the surrounding paragraph is worth the two minutes. The authors are more careful than their summarisers. Go to post

Post #67 is right about the mechanism and I think understates the practical bit.

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.

I checked the source rather than the summary, and they differ.

0 likes in reply to #10 13mo
PT
p.trevinoTL222 Jun 2025#71

Taking post #70 at face value and following it one step further.

Reporting rather than recommending, on antibiotics. What happened is above. Whether it should have is a different question and not one I am qualified to answer.

17 likes 13mo
R
RodriguesTL3Regular23 Jun 2025#72

Post #68 and I disagree about the size of the effect, not about the direction.

I read the earlier replies on antibiotics twice before writing this, because I had assumed the opposite and wanted to be sure I was disagreeing with what was said rather than what I expected.

0 likes 13mo
AZ
an.zamoraTL224 Jun 2025#73
isotonic_sheet, post #34: 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 the premise is wrong, everything after it is decoration. Go to post

Following this. I have the same question and no better information than the first post.

1 like in reply to #34 13mo
S
SHermansenTL2Member25 Jun 2025#74

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.

Speaking for myself and not for anyone else who has posted here.

7 likes 13mo
YA
y.adeyemiTL226 Jun 2025#75

SGLT2 inhibitors: frequently co-administered and relevant to renal and cardiovascular discussion, not to interactions. There is no pharmacokinetic interaction of concern.

A weak preference rather than a position.

24 likes 13mo
AT
a.thorneTL2Wiki editor28 Jun 2025#76

Post #72 put the caveat in the right place and I want to underline it.

The most useful reply I ever got about antibiotics was a request to state my units. It sounds like pedantry and it has saved me twice.

0 likes 13mo
JS
j.sandvikTL229 Jun 2025#77
m.guerrero, post #3: On the opening post — agreed on the reasoning, with one qualification. Thyroid medications: semaglutide is associated with a slowing of gastric emptying, which might affect thyroid medication absorption if they are taken very close together. Separating them by a few hours is the conservative approach. Happy to be corrected if someone… Go to post

Counterpoint on antibiotics, offered without confidence: the same observation is consistent with a much duller explanation, and nobody has ruled the dull one out.

3 likes in reply to #3 13mo
H
HadjipaterasTL1Member30 Jun 2025 · edited#78
d.nwosu, post #21: I had written a reply contradicting post #19 and deleted it. Here is what survived. Where the antibiotics discussion usually stalls is that nobody wants to say "I do not know" and everyone is willing to say "it varies". Those are the same sentence with different clothes on. Go to post

Thyroid medications: semaglutide is associated with a slowing of gastric emptying, which might affect thyroid medication absorption if they are taken very close together. Separating them by a few hours is the conservative approach.

Noting that I have skin in this question and have tried to discount for it.

11 likes in reply to #21 13mo
CC
c.chowdhuryTL21 Jul 2025#79

If you are new and reading this thread for the answer to antibiotics: the answer is conditional, the conditions are in the third reply, and the rest of the thread is worth skipping.

32 likes 13mo
TY
two_year_lineTL3Regular2 Jul 2025#80
vial_slope, post #57: Post #56 answers the question as asked. The question underneath it is different. The honest answer on antibiotics 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. Go to post

A supplement is a drug for interaction purposes, and the fact that it is sold without a prescription tells you nothing about whether it interacts. The paperwork is usually worse rather than better.

One case, stated as one case.

0 likes in reply to #57 13mo
JW
journalclub_wrenTL3Regular3 Jul 2025#81

What I would tell a new member reading about antibiotics for the first time: the confident posts are not the reliable ones, and the reliable ones are longer.

6 likes 13mo
EH
e.halonenTL25 Jul 2025#82

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.

I would be interested in a counterexample if anyone has one.

1 like 13mo
SS
steady_stateTL3Regular6 Jul 2025 · edited#83
journalclub_wren, post #81: What I would tell a new member reading about antibiotics for the first time: the confident posts are not the reliable ones, and the reliable ones are longer. Go to post

Adding a null result on antibiotics. I looked, carefully, and found nothing, and null results deserve posting precisely because they never are.

0 likes in reply to #81 13mo
YA
y.asanteTL27 Jul 2025#84
m.amankwah, post #7: Worth separating two things that post #3 runs together. Worth separating antibiotics as a question about the compound from antibiotics as a question about the documentation. They get answered by different people and only one of them is answerable here. Go to post

Post #81 answers the question as asked. The question underneath it is different.

Antibiotics would be much easier to settle if anyone reported the denominator. Almost nobody reports the denominator.

22 likes in reply to #7 13mo
NE
n.ekstromTL2Regular8 Jul 2025#85

Post #81 put the caveat in the right place and I want to underline it.

A pharmacist can answer most questions in this subcategory in a few minutes with access to a proper interaction database, and that access is the thing a forum does not have.

A guess, clearly labelled as one.

3 likes 13mo
TK
t.karlsenTL29 Jul 2025#86

Supplements and herbs: many have no established interaction. Some do. If you are taking something unusual, checking a reference (like a pharmacist) is more useful than guessing from forum discussion.

I would not lead a decision with this, but I would not ignore it either.

0 likes 13mo
YM
y.mensahTL3Wiki editor10 Jul 2025#87

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.

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

31 likes 13mo
CC
c.castellanosTL212 Jul 2025#88
vial_slope, post #57: Post #56 answers the question as asked. The question underneath it is different. The honest answer on antibiotics 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. Go to post

A note on scope: what I am saying about antibiotics applies to the case in the first post and I would not extend it further without checking.

16 likes in reply to #57 13mo
BJ
b.jankowiakTL3Regular13 Jul 2025#89

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.

1 like 13mo
RM
r.mensahTL214 Jul 2025#90