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ForumsSemaglutide (Ozempic / Wegovy)Semaglutide pharmacokinetics — half-life, Tmax, steady state modeling Page 2

Semaglutide pharmacokinetics — half-life, Tmax, steady state modeling

SarahChen_PharmD Mon, Jun 8, 2026 at 5:15 AM 10 replies 213 viewsPage 2 of 2
PeptideChemSF
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Jun 8, 2026 at 7:59 AM#6

Adding the numbers, since they settle part of this. Worth knowing that the injection site changes very little. Abdomen, thigh and upper arm are bioequivalent for semaglutide, so a site change is not a plausible explanation for a bad week.

Last edited: Jun 8, 2026 at 11:59 AM
39 9steve_okc, dave_SLC, FDA_TrackerJim and 36 others
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jason_paloalto
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Jun 8, 2026 at 9:03 AM#7

One thing that is still open after claudia_zurich’s answer:

Whether anyone has held at a sub-maximal dose long term and kept the result, or whether the maintenance data only exists at 2.4mg?

38 8Dr.PathRoch, mona_PHX, andrew_nyc and 35 others
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lisa_labSD
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Jun 8, 2026 at 10:07 AM#8
PeptideChemSF said:
Worth knowing that the injection site changes very little.

There is a second half to this that has not been said yet. 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.

37 7Dr.PulmRoch, maya_sedona, stefan_berlin and 34 others
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SarahChen_PharmD
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Jun 8, 2026 at 11:11 AM#9

Reporting back.

Closing this out: the trough rather than the peak explains the pattern I was seeing on day six, which I had been blaming on the vial.

36 6TinaHashiRN, robert_kc, dan_philly and 33 others
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Dr.NutriCornell
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Jun 8, 2026 at 4:19 PM#10
lisa_labSD said:
Steady state is the thing most people miss.

All true, with one condition: that curve is for people who reached the dose on schedule. Anyone who slowed the ladder for tolerability is on a different, flatter curve, and comparing yourself with the published mean will make you feel like a non-responder when you are not.

36 9pat_auckland, Dr.GastroMayo, JakeBK_lifts and 33 others
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