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is it normal to get constipation at week 29

Discussion Receipts ×1 Cold Box ×2 Clean Column ×2

Confession thread, sort of.

I went from 1.0mg to 15mg much faster than I should have because the scale had stalled and I got impatient. The stall broke about 11 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 constipation I did not need and a data point I cannot interpret. Two lessons in one.

Posting it in the hope that somebody at week 27 reads it before doing the same thing.

3,858 up / 923 down81% upvoted64 commentsid mj7chp25 Sep 2024

64 comments

30 in this archive, depth 5

best — the order this archive was captured in

u/arne_restrepo160 points·1 year ago

Water content matters more than people think. If a vial is carrying residual moisture, your "10mg" is not 10mg of peptide.

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u/swirl_dont_shakeMOD96 points·1 year ago

Retitled to remove editorialising. Put the evidence in the body.

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u/santiago_ndiayeOP100 points·1 year ago

Cored the stopper on my 22th draw because I kept using the same entry point. Rotate the puncture site.

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u/santiago_ndiayeOP57 points·1 year ago

Dead space ate 17 units on a low-volume draw. Tiny impact at 0.25mg, massive impact at 15mg.

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u/santiago_ndiayeOP35 points·1 year ago

Dead space ate 17 units on a low-volume draw.

Yes, exactly this, and it is the bit that took me 58 weeks to accept.

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u/anjali_tamm21 points·1 year ago

show your working or it is unhelpful

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u/runa_cabrera23 points·1 year ago·edited

Dead space ate 17 units on a low-volume draw.

Counter-anecdote: opposite result, same dose. Which mostly tells us the variance is huge.

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[removed]22 points·1 year ago

[removed by moderator]

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u/ilias_cabrera39 points·1 year ago

dosing errors come from people reconstituting two vials differently and forgetting which is which

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u/ines_lindqvist112 points·1 year ago

dosing errors come from people reconstituting two vials differently and forgetting which is which

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u/emil_wojcik-14 points·1 year ago

Slight fix: the number was 96.8, not 99.1. Decimal point, but a fairly consequential one.

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u/gradient_goblin59 points·1 year ago

the concentration on the vial in marker is the most important step

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u/saskia_rahimi106 points·1 year ago

This is correct. 2mL versus 22mL is the common mistake.

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u/nadia_kjaer59 points·1 year ago

Cosigning. The concentration on the vial in marker is load-bearing.

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u/honest_syringe_202572 points·1 year 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/bac_water_banditreconstitution47 points·1 year ago

Slight fix: the number was 98.7, not 99.3. Decimal point, but a fairly consequential one.

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u/cesar_ivaturi38 points·1 year ago

swirl, do not shake, or you are courting oxidation

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u/lurker_for_years22 points·1 year ago

Yeah, showing the arithmetic is the fastest way for someone to spot the error.

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u/runa_grimaldi22 points·1 year ago

Disagree. What you are describing is consistent with dead space, not with what you concluded.

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u/katrin_marchetti31 points·1 year ago

The confident tone is doing a lot of work that the evidence is not.

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u/sofia_danquah9 points·1 year ago

never post a calculation as advice without stating the concentration

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u/bac_water_banditreconstitution34 points·1 year ago

Is that 10mg vial or 21mg?

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u/nabila_espinoza26 points·1 year ago

u-100 syringe, not u-40, or your math is off by factor of 2

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u/hub_opssite staff17 points·1 year ago

i am begging people to write down the concentration

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u/yusuf_nakamura13 points·1 year 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/liv_nkemelu8 points·1 year ago

Yeah, showing the arithmetic is the fastest way for someone to spot the error.

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u/iman_falk4 points·1 year ago

15mg vial, 2mL water, concentration is 15/2 — write it on the vial afterwards

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u/ines_ekstrom15 points·1 year ago

Spent 8 weeks confused about concentration math until someone showed me the table. 15mg, 1mL, concentration is 15/1.

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u/marta_weiss0 points·1 year ago

never post a calculation as advice without stating the concentration

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