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ForumsPharmacology & MechanismsGlucagon receptor signaling — looking for input Page 2

Glucagon receptor signaling — looking for input

gary_naperville Fri, Apr 24, 2026 at 1:24 PM 8 replies 618 viewsPage 2 of 2
lisa_labSD
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Apr 24, 2026 at 4:43 PM#6

One concrete data point for the thread. Numbers worth memorising for this class: Tmax one to three days for the weekly peptides, terminal half-life about a week for semaglutide and about five days for tirzepatide, steady state at four to five half-lives, subcutaneous bioavailability high enough that site choice is irrelevant.

Last edited: Apr 24, 2026 at 7:43 PM
3 23stefan_berlin, Dr.EM_Chicago, pete_RVA
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anna.melb_AU
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Apr 24, 2026 at 6:00 PM#7

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

Which effects tachyphylax and which persist, because the answer explains why tolerability improves while the appetite effect keeps working?

2 22paige_pharma, emma_london
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Dr.GastroMayo
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Apr 24, 2026 at 7:17 PM#8
lisa_labSD said:
Numbers worth memorising for this class: Tmax one to three days for the weekly peptides, terminal half-life about a week for semaglutide and about…

There is a second half to this that has not been said yet. The mechanism and the magnitude are separate questions. Agreeing that something happens says nothing about whether it happens enough to act on.

Last edited: Apr 25, 2026 at 12:17 AM
1 21COA_Karl
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gary_naperville
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Apr 24, 2026 at 8:34 PM#9

OP back with an update, since a thread like this is useless without one.

Update — tachyphylaxis to the gastric effect, persistence of the appetite effect. Two curves, and I had been watching the wrong one.

Last edited: Apr 24, 2026 at 11:34 PM
50 20PharmHunterJen, TomTeleRx, DoseLogDan and 47 others
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PurityPaulOR
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Apr 25, 2026 at 2:45 AM#10
Dr.GastroMayo said:
The mechanism and the magnitude are separate questions.

True, with the qualification that this is a self-selected group. The people for whom it did not work post less, and that shapes everything we think we know.

48 23mike_mod, SarahChen_PharmD, sarah.morrison and 45 others
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