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c/retatrutide·posted 6 months ago by u/iman_castellanos

is it normal to get fatigue at week 5

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is it normal to get fatigue at week 5. Numbers below. Ask me the boring questions, they are the useful ones.

It is a triple agonist at the GLP-1, GIP and glucagon receptors. The glucagon arm is the genuinely novel component and it is the one with the least human outcome data behind it.

Increases in heart rate have been reported across this receptor class. The magnitude and clinical significance are exactly what phase 3 is powered to establish.

Please do not ask me what dose you should be on. I genuinely do not know and neither does anyone else here.

7,154 up / 669 down91% upvoted51 commentsid wqxs8520 Jan 2026

51 comments

13 in this archive, depth 3

best — the order this archive was captured in

u/fabio_lehtinen692 points·6 months ago

Glucagon receptor agonism is associated with increased energy expenditure and with hepatic effects. That is a mechanistic story with strong preclinical support and limited phase 2 human data.

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u/incretin_ivyMOD397 points·6 months ago

Removed the escalation schedule. There is no published protocol for members to follow and inventing one here is exactly what this board does not do.

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[removed]263 points·6 months ago

[removed by moderator]

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u/iman_castellanosOP282 points·6 months ago

comparing reta phase 2 to sema phase 3 is comparing different things

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u/kofi_balogun130 points·6 months ago

comparing reta phase 2 to sema phase 3 is comparing different things

Agreed, and the glucagon arm is exactly why the comparison threads do not work.

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u/noor_ivaturi273 points·6 months ago

Correction: TRIUMPH is the phase 3 programme. The number you are quoting is from the phase 2 readout, which is a different trial.

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u/emil_wojcik178 points·6 months ago

Yes — the glucagon arm is what makes it a different proposition rather than a stronger version of the others.

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u/mod_cold_roommod · c/coldchain484 points·6 months ago

the escalation is where most of the reported trouble sits

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u/zeynep_mbeki371 points·6 months ago

the TRIUMPH programme is still running, so anything definitive is premature

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u/jarno_cabrera-13 points·6 months ago

The phase 2 readout ran to 48 weeks in a few hundred participants with a slow escalation. Both the size and the duration matter when people quote the headline number.

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u/reflux_report277 points·6 months ago

Where the evidence actually stands, since every thread here assumes a different answer.

Phase 2 reported a large mean body weight change at 48 weeks across a few hundred participants with a slow, protocol-driven escalation. The effect size was striking. The confidence intervals were wide, the population was small, and the duration was under a year.

Phase 3 is running. Until it reports, everything else — including the ranking arguments this board loves — is extrapolation from a small study. That is not a criticism of the compound; it is a description of the evidence.

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u/bastian_ekstrom87 points·6 months ago

wait for phase 3 before you argue about rankings

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u/lurker_for_years41 points·6 months ago

nothing here is available as a prescription product, so read every thread with that in mind

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About c/retatrutide

Retatrutide: GIP/GLP-1/glucagon triple agonism, the TRIUMPH programme, and the fact that most people discussing it are handling research-grade material with no human-use approval anywhere. Dose-response, heart-rate signal, and the unusually steep phase-2 weight curves get argued about here weekly.

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