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ForumsDosing & ProtocolsPK/PD modeling for tirzepatide — anyone have experience? Page 4

PK/PD modeling for tirzepatide — anyone have experience?

CryptoCarl Sat, Jan 10, 2026 at 5:27 AM 24 replies 1,368 viewsPage 4 of 5
MASHdoc_SA
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Jan 19, 2026 at 9:18 PM#16

From the other side of the consultation, briefly. Take it one variable at a time. Almost every unanswerable question in these threads is unanswerable because three things changed in the same fortnight, and no amount of subsequent argument can untangle them after the fact.

Last edited: Jan 20, 2026 at 12:18 AM
24 22TirzTom, TrialTracker_MD, JennaRN and 21 others
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quinn_sf
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Jan 21, 2026 at 7:21 AM#17
MASHdoc_SA said:
Almost every unanswerable question in these threads is unanswerable because three things changed in the same fortnight, and no amount of subsequent…

Can confirm. Same sequence, different timescale. I had assumed I was the exception until I read this.

25 23Dr.PathRoch, mona_PHX, andrew_nyc and 22 others
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BenResearch_OR
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Jan 22, 2026 at 5:23 PM#18
MASHdoc_SA said:
Almost every unanswerable question in these threads is unanswerable because three things changed in the same fortnight, and no amount of subsequent…

Adding the part of the answer the thread has not reached. The pharmacokinetics explain nearly every practical question asked here. Albumin binding above 99% slows clearance enough to make weekly dosing possible; a terminal half-life near a week means four to five weeks to steady state and therefore a four-week titration interval; subcutaneous bioavailability around 89% means injection site barely matters. Those three facts answer most timing questions before they are asked.

Worth separating that from the pharmacology, which this thread keeps folding into the same question. They behave differently and the advice does not transfer.

26 24Dr.NateNeph, PharmD_Rodriguez, julia.endo and 23 others
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kate.chem
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Jan 24, 2026 at 3:24 AM#19

Adding the numbers, since they settle part of this. One practical note: write down what you did and when, before you need it. Reconstructing a timeline from memory three months later is how people end up unable to answer the one question that would have resolved it.

27 0jennifer_SEA, tyler_CSCS, VanRx_Mike and 24 others
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robert_kc
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Jan 25, 2026 at 1:25 PM#20

Moderator note: good thread. Keeping it here rather than moving it, because the question is general enough to be useful.

Last edited: Jan 25, 2026 at 3:25 PM
49 22PharmHunterJen, TomTeleRx, DoseLogDan and 46 others
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