Delayed gastric emptying and oral medication absorption: which drugs matter posts 61–90
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.
Where I part company with post #58, and it is a narrow parting.
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.
Oral medications versus time: if you take an oral medication 30 minutes before semaglutide (which slows gastric emptying), the delayed stomach emptying affects when and where the oral medication is absorbed. Separating by a larger interval (1 to 2 hours) usually resolves this.
Stating my assumptions rather than smuggling them in.
What I would check first on delayed gastric emptying and oral is whether the thing being measured moved or whether the way of measuring it moved. Those look identical in a graph.
Building on post #64 rather than restating it.
Practical experience of delayed gastric emptying and oral, offered as one case with the conditions stated, not as a general finding. Conditions first, because they are what make it interpretable.
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.
Marking that as an opinion rather than a finding.
Everything in post #66 holds. The case it does not cover is the one I have.
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.
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.
Anyone who has looked at this more carefully, please correct the record.
Delayed gastric emptying and oral is a good example of a question where the honest answer is boring and the interesting answers are unsupported. I would go with boring.
Where I part company with post #69, and it is a narrow parting.
What I can speak to on delayed gastric emptying and oral is narrow, so I will keep it narrow rather than generalising from it. Beyond that boundary I do not know.
Post #69 is the version of this I will quote in future. One addition.
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 most useful reply I ever got about delayed gastric emptying and oral was a request to state my units. It sounds like pedantry and it has saved me twice.
Since delayed gastric emptying and oral keeps coming up, it should probably be a maintained page rather than a recurring thread. I am happy to draft it if someone with more direct experience will review it.
I had written a reply contradicting post #73 and deleted it. Here is what survived.
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.
I came in to disagree and I am leaving without a disagreement.
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.
The short version is the first sentence; the rest is why.
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.
That is one dataset and I would not build a rule on it.
I read the earlier replies on delayed gastric emptying and oral 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.
Delayed gastric emptying and oral came up in a thread eighteen months ago and was answered well. I cannot find it, which is itself the problem, so here is the reconstruction.
Post #82 is right about the mechanism and I think understates the practical bit.
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.
This has been discussed before and I could not find the thread, so, again.
Coming back to post #80, because the follow-up matters more than the original answer.
Worth stating the null on delayed gastric emptying and oral before we explain it: the observation may be nothing. That possibility deserves a sentence and usually does not get one.
On delayed gastric emptying and oral I would separate what is worth knowing from what is worth acting on. The first list is long and the second is short, and conflating them is how threads get heated.
Sensible. I would want the same detail before I acted on it either.
Collapsed as off-topic by two members at trust level 3 or above
Coming back to post #84, because the follow-up matters more than the original answer.
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.
Collapsed as off-topic by two members at trust level 3 or above
Taking post #87 at face value and following it one step further.
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.
Small point, but it is the one that usually catches people.
Post #87 and I disagree about the size of the effect, not about the direction.
Vitamins: most vitamins have no significant interaction. Fat-soluble vitamins (A, D, E, K) might be affected by the slowing of fat absorption during weight loss, but that is a nutritional consequence rather than an interaction.
Worth one more sentence than it usually gets.