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ForumsOral GLP-1 AgonistsOral semaglutide bioavailability optimization — meal timing evidence Page 2

Oral semaglutide bioavailability optimization — meal timing evidence

Dr.GastroMayo Wed, Jun 3, 2026 at 5:52 AM 17 replies 337 viewsPage 2 of 4
VendorMark
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Jun 3, 2026 at 5:21 PM#6

The figures, for anyone assembling their own picture. For anyone assembling their own picture: Tmax is one to three days, terminal half-life about 165 to 170 hours, steady state at four to five weeks, and subcutaneous bioavailability near 89%. Those four numbers explain most of the questions people ask about timing.

Last edited: Jun 3, 2026 at 7:21 PM
23 18DebRD_ATL, KristenIndy, MarkLI_maint and 20 others
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LindaRN_retired
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Jun 3, 2026 at 9:57 PM#7

Following on from BariatricNurseD — and this may be the naive question:

Whether the fasting requirement is as strict in practice as the label implies, and what people actually see when they get it wrong?

22 17Dr.GutHealth, amsterdam_pete, LondonLisa and 19 others
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Dr.EndoIndy
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Jun 4, 2026 at 2:32 AM#8
VendorMark said:
For anyone assembling their own picture: Tmax is one to three days, terminal half-life about 165 to 170 hours, steady state at four to five weeks, and…

Coming at VendorMark’s question from a different direction. Steady state is the thing most people miss. The terminal half-life is about a week, so every dose step takes four to five weeks to fully express itself. Judging a step at day ten is judging the ascent, not the plateau, and it is the single commonest reason people escalate before they needed to.

21 16marcus_mpls, DeniseRN_TPA, SandraNC_45 and 18 others
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Dr.GastroMayo
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Jun 4, 2026 at 7:07 AM#9

Closing the loop on my own question.

I moved the tablet to the moment I wake up rather than trying to fit it around breakfast, and the difference in the following weeks was obvious. It was a timing problem, not a dose problem.

Last edited: Jun 4, 2026 at 12:07 PM
20 15MikeFit_NJ, InsuranceTom, WendyG_ATL and 17 others
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KevinCompounds
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Jun 5, 2026 at 5:10 AM#10
Dr.EndoIndy said:
Steady state is the thing most people miss.

No disagreement with Dr.EndoIndy. One condition attached. Worth adding that the tablet is taken daily, so a missed dose costs far less than a missed weekly injection. That is a genuine advantage nobody lists.

Last edited: Jun 5, 2026 at 7:10 AM
4 2NurseAsh_DET, BenResearch_OR, MikeKY_noInsulin and 1 other
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