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ForumsTirzepatide (Mounjaro / Zepbound)GIP receptor: the underappreciated half of tirzepatide's mechanism Page 3

GIP receptor: the underappreciated half of tirzepatide's mechanism

NeuroNate Sat, May 9, 2026 at 2:22 AM 19 replies 575 viewsPage 3 of 4
stefan_berlin
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May 9, 2026 at 11:48 AM#11
Dr.SportsMedIN said:
Steady state is faster than people expect: half-life about five days, so you are at plateau in roughly three to four weeks rather than five.

This is exactly what I could not find anywhere else. Printing the relevant bit and taking it with me.

Last edited: May 9, 2026 at 2:48 PM
30 5NeuroNate, JessicaH_TX, KevinCompounds and 27 others
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CarlaRPh_TPA
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May 9, 2026 at 4:13 PM#12

Clinical perspective, offered as context rather than as advice.

Dose-response modeling for tirzepatide: Emax model fitting to the STEP/SURMOUNT dose-finding data shows:

Semaglutide: ED50 ≈ 0.6mg, Emax ≈ -18%, Hill coefficient ≈ 1.3
Tirzepatide: ED50 ≈ 6mg, Emax ≈ -25%, Hill coefficient ≈ 1.5

Clinical implication: most patients achieve >80% of maximal response by the mid-range dose (1.7mg sema, 10mg tirz). Going to the maximum dose provides diminishing returns — possibly not worth the additional side effect burden for some patients. Individualize dosing based on response vs tolerability.

29 4ricardo_MIA, BrianDallas92, labquiet_amy and 26 others
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VendorMark
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May 9, 2026 at 8:38 PM#13
lisa_labSD said:
The mechanism is more central than most summaries suggest.

Filing a mild objection. Mild because I might be wrong; an objection because nobody has addressed the case that does not fit. The counter-case has not been addressed. Somebody upthread described the situation that does not fit, and the thread moved on rather than engaging with it, which is the failure mode this board is supposed to avoid.

28 3MarkLI_maint, Dr.PeteFamMed, claudia_zurich and 25 others
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dave_SLC
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May 10, 2026 at 1:03 AM#14

The figures, for anyone assembling their own picture. Practical: whatever you change, write down the date and the reason. In three months the reason is what you will have forgotten, and the reason is what makes the record worth having.

Correct me if the detail matters more than I have assumed.

27 2FranDenver, Dr.BariatricHTX, LindaRN_retired and 24 others
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Admin
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May 10, 2026 at 5:28 AM#15

Moderator note: reminder that nothing in this thread is medical advice, and that clinical claims need a source. Tagging this one for the weekly digest.

Last edited: May 10, 2026 at 9:28 AM
26 1PeptideSynthNJ, Dr.KarenChen, Dr.NateNeph and 23 others
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