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c/tirzepatide·posted 8 months ago by u/ignacio_vanhecke

three years of 15mg threads, summarised so you do not have to read them

Results Well Actually ×4 Sourced ×2 Receipts ×2

three years of 15mg threads, summarised so you do not have to read them. It is the sort of thing everyone half-believes and nobody writes down.

The numbers the title promised, since a headline without them is worthless: 15mg. Everything below is context for those.

Came off sema and onto tirz with a two-week gap. The first month was flat and I assumed I had made a mistake. Month two it moved.

Sulphur burps for the first eight days after each step, then nothing. Predictable enough that I planned my week around it.

Sceptical readings welcome. The confident ones are the ones I distrust.

6,504 up / 418 down94% upvoted45 commentsid o4yagm16 Nov 2025

45 comments

30 in this archive, depth 6

best — the order this archive was captured in

u/incretin_ivyMOD439 points·8 months ago

Trial identifiers corrected in the title. SURMOUNT and SURPASS are different programmes.

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u/samir_falk385 points·8 months ago

It is a dual GIP and GLP-1 receptor agonist, and the GIP arm is the part that has no equivalent in the semaglutide threads. That is why the side-effect profile reads differently rather than just milder.

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u/georgi_chowdhury132 points·8 months ago

dual agonist, so the GIP arm is doing something the sema threads will not tell you about

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u/tarek_kirchner131 points·8 months ago·edited

It is a dual GIP and GLP-1 receptor agonist, and the GIP arm is the part that has no equivalent in the semaglutide threads.

samir_falk is right that the two molecules are not interchangeable. There is no published conversion and the ones circulating are invented.

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u/discount_math_dm43 points·8 months ago

sulphur burps are the signature complaint and they are not dangerous

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u/hair_shed_hannah172 points·8 months ago

Switching from semaglutide, since three people asked in this thread alone.

There is no published dose equivalence between the two. The conversion tables that circulate are somebody’s arithmetic, not data. What people report here is that the first month after a switch is often flat, that the appetite effect feels differently shaped rather than simply stronger, and that starting at the bottom of the ladder again is the common approach.

None of that is a recommendation. It is what the threads say, and the threads are not a clinic.

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u/bastian_eriksen73 points·8 months ago

Pen or vial? The step sizes available differ and it changes this answer.

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u/ignacio_vanheckeOP102 points·8 months ago

What is the waist doing? That is usually the number still moving during a scale stall.

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u/ferritin_low187 points·8 months ago

Did you come to this from sema, and if so how long was the gap?

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u/ingrid_correia153 points·8 months ago

Which week did the appetite change actually land for you?

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[deleted]108 points·8 months ago

[deleted]

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u/sanne_novak91 points·8 months ago

That percentage is body weight change, not body fat. Different measurement, and the distinction gets lost every time.

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u/quiet_moderatormod44 points·8 months ago

hold the dose that works, the ladder is not a leaderboard

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u/tarek_lokken69 points·8 months ago

2.5 is the starter dose and it is not meant to be the dose that works

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u/discount_math_dm-14 points·8 months ago

SURMOUNT-1 landed around 21% at 72 weeks on the top arm

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u/copay_card_cc178 points·8 months ago

Went 10 to 12.5 on the calendar and had the worst fortnight of the whole run. Dropped back to 10 and everything settled.

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u/ignacio_vanheckeOP83 points·8 months ago

Week 67 was the first time the scale moved after a five-week stall. I changed nothing in that window.

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u/vito_chowdhury154 points·8 months ago

the four-week step schedule is the label, not folklore

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u/ignacio_vanheckeOP78 points·8 months ago

Does nausea follow the day after the shot, or is it spread across the week?

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u/bastian_eriksen63 points·8 months ago

Push back: "gentler than sema" is a population statement. Plenty of people on this board have the opposite experience and they are not doing it wrong.

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u/dario_vermeulen22 points·8 months ago

zepbound and mounjaro are the same compound with different labels

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u/yusuf_ramos15 points·8 months ago

Small fix: SURMOUNT is the obesity programme, SURPASS is the type-2 programme. They are different endpoints and the numbers do not transfer.

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u/ahmed_fonseca87 points·8 months ago

20kg over 66 weeks, never went past 10mg, and injection-site soreness stayed mild the whole way. Posting because the loud threads are all 15mg.

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u/signe_villalobos20 points·8 months ago

week 6 is early to draw any conclusion at all

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u/amara_halonen73 points·8 months ago

Held 7.5 for five months. Everyone kept asking when I was going to 10. The answer was never, because 7.5 was working.

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u/rania_diallo39 points·8 months ago

Are you comparing yourself with the trial mean or with the people who post the most?

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u/swirl_dont_shakereconstitution40 points·8 months ago

Right. And the sema-to-tirz "conversion" people post is invented. There is no published equivalence.

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u/emil_barros21 points·8 months ago·edited

Have you held a step for longer than the four-week minimum at any point?

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u/discount_math_dm28 points·8 months ago

Weekly dosing again, half-life in the same neighbourhood as sema, so a step change takes about a month to reach steady state. Judging a new step at day five is judging noise.

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u/signe_villalobos34 points·8 months ago

Appetite effect for me is flat across seven days. On sema it was a wave. Same person, different molecule.

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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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