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ForumsTirzepatide (Mounjaro / Zepbound)SURMOUNT-5: Tirzepatide vs semaglutide head-to-head — November 2025 Page 6

SURMOUNT-5: Tirzepatide vs semaglutide head-to-head — November 2025

LabKate Sat, Mar 14, 2026 at 9:46 PM 36 replies 1,552 viewsPage 6 of 8
alex_tucson
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Mar 30, 2026 at 3:33 AM#26
Dr.RaviCardio 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…

That reframing is the part I needed.

42 15emily_PDX, Dr.SleepRoch, laura_annarbor and 39 others
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VendorMark
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Apr 1, 2026 at 12:42 AM#27

Adding the clinical framing, because it changes how the question reads. There is a difference between no evidence and evidence of no effect, and this subject is one where the two get swapped freely in both directions.

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Dr.ObesityMed
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Apr 2, 2026 at 9:50 PM#28
VendorMark said:
There is a difference between no evidence and evidence of no effect, and this subject is one where the two get swapped freely in both directions.

This is my experience too, for whatever a second data point is worth. Posting only so the count is not one.

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maria_elpaso
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Apr 4, 2026 at 6:57 PM#29
VendorMark said:
There is a difference between no evidence and evidence of no effect, and this subject is one where the two get swapped freely in both directions.

There is a second half to this that has not been said yet. The mechanism that matters here is not stomach emptying, it is central. GLP-1 receptor agonism in the arcuate nucleus stimulates POMC neurons and suppresses AgRP/NPY signalling, which is why the effect is appetite and food salience rather than physical fullness. Delayed gastric emptying largely tachyphylaxes over the first months; the appetite effect does not.

Last edited: Apr 5, 2026 at 12:57 AM
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LabKate
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Apr 6, 2026 at 4:03 PM#30

Reporting back.

Update since I posted: I held at 1.7mg for a further twelve weeks and lost another 4kg slowly, which settles it for me. I was escalating because the number was available, not because I had stopped responding.

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