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c/tirzepatide·posted 12 months ago by u/santiago_villalobos

GIP: what the trials say vs what this community says

Question Well Actually ×6 Slow Clap ×1 Receipts ×2

Confession thread, sort of.

I went from 10mg to 2.5mg much faster than I should have because the scale had stalled and I got impatient. The stall broke about 3 weeks later, at which point I had no way of knowing whether the dose increase did anything or whether it would have broken anyway.

So now I have injection-site soreness I did not need and a data point I cannot interpret. Two lessons in one.

Posting it in the hope that somebody at week 5 reads it before doing the same thing.

3,954 up / 659 down86% upvoted28 commentsid qcy9id2 Aug 2025

28 comments

18 in this archive, depth 4

best — the order this archive was captured in

u/curious_panel_only609 points·12 months ago

The evidence standard in c/vendorvetting gets called too strict about once a month, and every time, the thread ends with the complainant agreeing.

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u/incretin_ivyMOD305 points·12 months ago

This is an urgent-care question wearing a forum question's clothes. Please contact a clinician rather than waiting for replies.

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u/santiago_villalobosOP189 points·12 months ago

week 50 on Mounjaro and the appetite profile is genuinely different from sema

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u/yusuf_ramos-35 points·12 months ago
this is the answer
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u/customs_seizure_sid1 point·12 months ago

nope, the equivalence to semaglutide is not known, comparing 15mg tirz to 2.4mg sema is guessing

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u/laila_wikstrom312 points·12 months ago

Inter-lab variance on this kind of assay is routinely 1–2 points. Different column, different gradient, different integration.

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u/curious_panel_only152 points·12 months ago

SURMOUNT data is messier than STEP data but the weight loss is there

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u/graph_it_gary124 points·12 months ago·edited

Not to be pedantic but Zepbound and SURPASS are being used interchangeably and they are not interchangeable in real life.

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u/copay_card_cc60 points·11 months ago

What was the trial arm you are quoting from? SURMOUNT-1, -2, -3 are all different.

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u/santiago_villalobosOP81 points·11 months ago

the appetite change on tirz is more than just reduced hunger, it is different machinery

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u/gustav_vermeulen229 points·12 months ago·edited

stalled on sema, tried tirz, and the curves were actually different shapes

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u/copay_card_cc165 points·12 months ago

Disagree but this is the good kind of wrong — it is specific enough to be checked.

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u/laila_wikstrom112 points·12 months ago

nope, the equivalence to semaglutide is not known, comparing 15mg tirz to 2.4mg sema is guessing

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u/kaia_cabrera37 points·12 months ago

This matches the trial data. SURMOUNT-1 was 98.3% body weight at 13 weeks.

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u/elin_ferrari115 points·12 months ago

Rodent data is rodent data. Dose scaling is not linear and the models tell you what to investigate, not what to expect.

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u/sofia_nascimento0 points·12 months ago

SURMOUNT data is messier than STEP data but the weight loss is there

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[removed]1 point·12 months ago

[removed by moderator]

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u/two_mil_or_one1 point·11 months ago

nope, the equivalence to semaglutide is not known, comparing 15mg tirz to 2.4mg sema is guessing

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About c/tirzepatide

Tirzepatide-specific discussion: the dual-agonist pharmacology, the 2.5 → 15mg ladder, the appetite profile people describe as different from semaglutide, and the SURMOUNT/SURPASS trial programme. Comparisons with semaglutide are welcome as long as they are specific about dose equivalence being unknown.

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