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Compounds · Semaglutide

Revisiting: Semaglutide formulation: what is in the licensed product besides the peptide

Solved
Solved by z.vogel in post #8
I read post #6 twice before replying, because I had assumed the opposite. The mass figure differs between sources because of how the different entities report it. The monoisotopic mass of the bare peptide is one number; the mass including the acylation is another. Different sources emphasise different details.

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UC
unit_conversionTL3Regular12 Dec 2024#1

Posting this under the heading it deserves: Revisiting: Semaglutide formulation: what is in the licensed product besides the peptide Everything below is what sits behind that.

I have seen SURMOUNT-4 (JAMA, 2024) cited in support of a claim I do not think it supports, twice this month, so I would like to work through what it actually shows.

My reading is that the trial is sound for its own question and is being stretched to answer a different one. I might be wrong about that, which is why this is a topic rather than a correction.

What I would like from this discussion: someone who disagrees with me to say why, with the section of the paper they are relying on.

13 likes 20mo
ZA
z.adeyemiTL2 Moderator13 Dec 2024#2

On alcohol: the labelling does not contraindicate it, but it raises gastric irritation risk and semaglutide already does that. There is no published interaction study and the conservative position is to limit it if you are titrating or if gastrointestinal symptoms are troublesome.

17 likes 19mo
CN
cohort_notesTL2Member14 Dec 2024 · edited#3

Picking up post #2: that is the part I would want checked first.

The SELECT trial changed the positioning because it was the first cardiovascular outcome trial in people without diabetes. That decoupled the cardiovascular argument from glycaemic control, which is why it mattered beyond its own numbers.

0 likes 19mo
SK
s.kravchenkoTL2 Moderator14 Dec 2024#4
cohort_notes, post #3: Picking up post #2: that is the part I would want checked first. The SELECT trial changed the positioning because it was the first cardiovascular outcome trial in people without diabetes. That decoupled the cardiovascular argument from glycaemic control, which is why it mattered beyond its own numbers. Go to post

Coming back to the opening post, because the follow-up matters more than the original answer.

Semaglutide versus liraglutide in STEP 8: semaglutide produced greater weight reduction and the discontinuation rates differed. But the trial was open-label for the dosing schedule, which admits expectation effects. Weekly versus daily itself is part of the comparison, not a confounding variable to be removed.

1 like in reply to #3 19mo
GF
gradient_fileTL2Member15 Dec 2024#5

The STEP programme populations were selected: enrollment criteria required baseline body mass index over 30, no recent blood pressure crisis, no recent retinopathy, no renal disease at the time. Applying results from that population to someone well outside it is an extrapolation and should be called one.

4 likes 19mo
FE
f.espinozaTL2 Moderator15 Dec 2024#6

Gastric emptying delay is the mechanism behind most of the gastrointestinal side effects. Slowing the stomach empties it feeds less food into the intestines at a time, which is part of the satiety mechanism but is also why nausea is dose-dependent and titration-dependent.

11 likes 19mo
W
WoodhouseTL2Member15 Dec 2024#7
cohort_notes, post #3: Picking up post #2: that is the part I would want checked first. The SELECT trial changed the positioning because it was the first cardiovascular outcome trial in people without diabetes. That decoupled the cardiovascular argument from glycaemic control, which is why it mattered beyond its own numbers. Go to post

Albumin binding is not a unique structural feature and nothing in the class lacks it, but the reversibility matters. Semaglutide binds albumin covalently through a fatty side chain, which creates a very long half-life at the cost of sequestering the free form. That is a trade-off and it is the trade-off that allows weekly dosing.

33 likes in reply to #3 19mo
ZV
z.vogelTL2 Moderator Solution16 Dec 2024#8
gradient_file, post #5: The STEP programme populations were selected: enrollment criteria required baseline body mass index over 30, no recent blood pressure crisis, no recent retinopathy, no renal disease at the time. Applying results from that population to someone well outside it is an extrapolation and should be called one. Go to post

I read post #6 twice before replying, because I had assumed the opposite.

The mass figure differs between sources because of how the different entities report it. The monoisotopic mass of the bare peptide is one number; the mass including the acylation is another. Different sources emphasise different details.

7 likes in reply to #5 19mo
KB
k.brandl_deTL3Translator · DE16 Dec 2024#9
f.espinoza, post #6: Gastric emptying delay is the mechanism behind most of the gastrointestinal side effects. Slowing the stomach empties it feeds less food into the intestines at a time, which is part of the satiety mechanism but is also why nausea is dose-dependent and titration-dependent. Go to post

post #8 answers the question as asked. The question underneath it is different.

The opalescent appearance in semaglutide solutions is occasionally noted and the mechanism is unclear. It does not appear to correlate with product failure in practice. Visible particles or frank cloudiness is different and would be reason to contact the supplier.

1 like in reply to #6 19mo
AN
a.nascimentoTL2 Moderator16 Dec 2024#10

Approved indications differ by jurisdiction and change. As of mid-2026 the weight-management indication is approved in many European jurisdictions but not all, and access is still narrower in others. For your own region, check the regulatory website rather than a forum summary.

7 likes 19mo
LV
l.vukovicTL2 Moderator17 Dec 2024#11

Coming back to post #9, because the follow-up matters more than the original answer.

The C-cell question: semaglutide triggered medullary thyroid carcinoma in rodent toxicology studies. A signal in rodents does not automatically appear in humans, but it is the reason the compound is contraindicated in people with personal or family history of medullary thyroid carcinoma or multiple endocrine neoplasia type 2.

0 likes 19mo
WP
weekly_pinTL2Regular17 Dec 2024#12

For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.

19 likes 19mo
SA
s.adebayoTL2 Moderator17 Dec 2024#13
weekly_pin, post #12: For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use. Go to post

Is there a ceiling dose beyond which the effect plateaus? The trials did not study that because they stopped at 2.4 mg. Some people report trying higher doses, but trial data is absent and off-label dosing enters territory this site does not advise on.

8 likes in reply to #12 19mo
FN
formulary_notesTL3Regular18 Dec 2024 · edited#14

post #13 answers the question as asked. The question underneath it is different.

The 165 to 184 hour range: that is roughly 7 to 7.6 days, which is why the weekly schedule works. Below 4 half-lives you are not approaching steady state yet, which is the pharmacological argument for the four-week step interval.

2 likes 19mo
RW
r.weissTL218 Dec 2024#15
IA
i.aranda_esTL2Translator · ES18 Dec 2024#16

This follows post #13 rather than contradicting it.

Is there a ceiling dose beyond which the effect plateaus? The trials did not study that because they stopped at 2.4 mg. Some people report trying higher doses, but trial data is absent and off-label dosing enters territory this site does not advise on.

13 likes 19mo
II
i.ilungaTL2 Moderator19 Dec 2024#17
formulary_notes, post #14: post #13 answers the question as asked. The question underneath it is different. The 165 to 184 hour range: that is roughly 7 to 7.6 days, which is why the weekly schedule works. Below 4 half-lives you are not approaching steady state yet, which is the pharmacological argument for the four-week step interval. Go to post

The C-cell question: semaglutide triggered medullary thyroid carcinoma in rodent toxicology studies. A signal in rodents does not automatically appear in humans, but it is the reason the compound is contraindicated in people with personal or family history of medullary thyroid carcinoma or multiple endocrine neoplasia type 2.

5 likes in reply to #14 19mo
SL
sleep_logTL2Regular19 Dec 2024#18

Approved indications differ by jurisdiction and change. As of mid-2026 the weight-management indication is approved in many European jurisdictions but not all, and access is still narrower in others. For your own region, check the regulatory website rather than a forum summary.

0 likes 19mo
TD
t.dumitruTL2 Moderator19 Dec 2024#19

The 165 to 184 hour range: that is roughly 7 to 7.6 days, which is why the weekly schedule works. Below 4 half-lives you are not approaching steady state yet, which is the pharmacological argument for the four-week step interval.

0 likes 19mo
C
chromatogramTL4Analytical chemist20 Dec 2024#20
Woodhouse, post #7: Albumin binding is not a unique structural feature and nothing in the class lacks it, but the reversibility matters. Semaglutide binds albumin covalently through a fatty side chain, which creates a very long half-life at the cost of sequestering the free form. That is a trade-off and it is the trade-off that allows weekly dosing. Go to post

Albumin binding is not a unique structural feature and nothing in the class lacks it, but the reversibility matters. Semaglutide binds albumin covalently through a fatty side chain, which creates a very long half-life at the cost of sequestering the free form. That is a trade-off and it is the trade-off that allows weekly dosing.

0 likes in reply to #7 19mo
L
LJankowiakTL3Regular20 Dec 2024#21

The opalescent appearance in semaglutide solutions is occasionally noted and the mechanism is unclear. It does not appear to correlate with product failure in practice. Visible particles or frank cloudiness is different and would be reason to contact the supplier.

3 likes 19mo
AC
a.cardosoTL2 Moderator20 Dec 2024 · edited#22
z.vogel, post #8: I read post #6 twice before replying, because I had assumed the opposite. The mass figure differs between sources because of how the different entities report it. The monoisotopic mass of the bare peptide is one number; the mass including the acylation is another. Different sources emphasise different details. Go to post

Coming back to post #20, because the follow-up matters more than the original answer.

On alcohol: the labelling does not contraindicate it, but it raises gastric irritation risk and semaglutide already does that. There is no published interaction study and the conservative position is to limit it if you are titrating or if gastrointestinal symptoms are troublesome.

10 likes in reply to #8 19mo
AD
ambient_draftTL3Regular21 Dec 2024#23
r.weiss, post #15: I read post #13 twice before replying, because I had assumed the opposite. Two things before anyone answers the substance. First, the context in the first post is clear and specific. Second, the question is framed so that an answer can actually address it. Both are the norm here and both matter more than they sound. Go to post

post #22 answers the question as asked. The question underneath it is different.

The SELECT trial changed the positioning because it was the first cardiovascular outcome trial in people without diabetes. That decoupled the cardiovascular argument from glycaemic control, which is why it mattered beyond its own numbers.

31 likes in reply to #15 19mo
MA
mi.amankwahTL2 Moderator21 Dec 2024#24

Two things before anyone answers the substance.

First, the context in the first post is clear and specific. Second, the question is framed so that an answer can actually address it. Both are the norm here and both matter more than they sound.

0 likes 19mo
TS
t.steenkampTL2Member21 Dec 2024#25

The STEP programme populations were selected: enrollment criteria required baseline body mass index over 30, no recent blood pressure crisis, no recent retinopathy, no renal disease at the time. Applying results from that population to someone well outside it is an extrapolation and should be called one.

1 like 19mo
KA
k.adeyemiTL2 Moderator21 Dec 2024#26
f.espinoza, post #6: Gastric emptying delay is the mechanism behind most of the gastrointestinal side effects. Slowing the stomach empties it feeds less food into the intestines at a time, which is part of the satiety mechanism but is also why nausea is dose-dependent and titration-dependent. Go to post

Gastric emptying delay is the mechanism behind most of the gastrointestinal side effects. Slowing the stomach empties it feeds less food into the intestines at a time, which is part of the satiety mechanism but is also why nausea is dose-dependent and titration-dependent.

6 likes in reply to #6 19mo
HH
h.hutchingsTL1Member22 Dec 2024#27

post #26 is right about the mechanism and I think understates the practical bit.

I disagree with the reply above, and I think the disagreement is substantive rather than terminological.

The distinction being drawn does not survive when you look at the published data for this specific question. I would be glad to be shown wrong on this, because the version I am arguing against is more convenient.

23 likes 19mo
AW
ai.wikstromTL2 Moderator22 Dec 2024#28

Worth separating two things that post #24 runs together.

The mass figure differs between sources because of how the different entities report it. The monoisotopic mass of the bare peptide is one number; the mass including the acylation is another. Different sources emphasise different details.

0 likes 19mo
LS
l.sarkissianTL2Member22 Dec 2024#29
k.adeyemi, post #26: Gastric emptying delay is the mechanism behind most of the gastrointestinal side effects. Slowing the stomach empties it feeds less food into the intestines at a time, which is part of the satiety mechanism but is also why nausea is dose-dependent and titration-dependent. Go to post

Picking up post #26: that is the part I would want checked first.

Semaglutide versus liraglutide in STEP 8: semaglutide produced greater weight reduction and the discontinuation rates differed. But the trial was open-label for the dosing schedule, which admits expectation effects. Weekly versus daily itself is part of the comparison, not a confounding variable to be removed.

0 likes in reply to #26 19mo
CN
c.nybergTL2 Moderator23 Dec 2024#30
s.kravchenko, post #4: Coming back to the opening post, because the follow-up matters more than the original answer. Semaglutide versus liraglutide in STEP 8: semaglutide produced greater weight reduction and the discontinuation rates differed. But the trial was open-label for the dosing schedule, which admits expectation effects. Weekly versus daily itself… Go to post

Two things before anyone answers the substance.

First, the context in the first post is clear and specific. Second, the question is framed so that an answer can actually address it. Both are the norm here and both matter more than they sound.

3 likes in reply to #4 19mo