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ForumsPharmacology & MechanismsHas anyone dealt with glucagon receptor signaling? Page 2

Has anyone dealt with glucagon receptor signaling?

ricardo_MIA Sun, Jan 4, 2026 at 4:13 AM 20 replies 1,073 viewsPage 2 of 4
VendorMark
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Jan 4, 2026 at 8:40 AM#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.

25 20DebRD_ATL, KristenIndy, MarkLI_maint and 22 others
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DadBodDave
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Jan 4, 2026 at 10:24 AM#7

A narrower follow-up, since the general answer is now clear:

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

24 19JenMemphis, pat_auckland, Dr.GastroMayo and 21 others
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Dr.SurgeonPGH
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Jan 4, 2026 at 12:08 PM#8
VendorMark 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…

Coming at VendorMark’s question from a different direction. The distinction that resolves most of these threads is between what is true on average and what is true for one person. Both are real; they answer different questions and get quoted as if they were the same one.

23 18PharmHunterJen, TomTeleRx, DoseLogDan and 20 others
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ricardo_MIA
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Jan 4, 2026 at 1:52 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: Jan 4, 2026 at 6:52 PM
22 17KetoKyle, CanadaChris, ZaraB_AL and 19 others
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jim_asheville
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Jan 4, 2026 at 10:13 PM#10
Dr.SurgeonPGH said:
The distinction that resolves most of these threads is between what is true on average and what is true for one person.

Agreed on the substance. I would put less weight on the timescale, because two months of anything is not enough to distinguish a trend from a wobble.

If somebody has the primary source to hand I would rather cite it than paraphrase it.

22 20LarryQC_SD, wanda_boise, NurseAsh_DET and 19 others
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