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c/reconstitution·posted 6 months ago by u/liv_nkemelu

Spain: concentration, and what it actually costs here

Question Clean Column ×6 Slow Clap ×2 Receipts ×1

Quick one. Canada here.

reconstitution works very differently where I live than in the threads that dominate the front page, and I keep seeing people confidently given advice that simply does not apply outside the US.

Specifics: the route I used took 10 weeks and cost roughly what I expected. The admin was worse than the cost. The thing that would have saved me the most time was knowing which document to ask for at the start.

Happy to answer questions from anyone in the same jurisdiction.

6,536 up / 2,473 down73% upvoted58 commentsid a5fvpj11 Jan 2026

58 comments

30 in this archive, depth 5

best — the order this archive was captured in

u/india_generic_g562 points·6 months ago

Three years on this site and the questions have not changed at all. Which is depressing or reassuring depending on the day.

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u/honest_syringe_maybe371 points·6 months ago

Respectfully this is a sample of one presented as a finding.

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[removed]281 points·6 months ago

[removed by moderator]

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u/santiago_ndiaye393 points·6 months ago

The single most useful thing I did was write the concentration on the vial. Stopped all the confusion after that.

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u/oskar_ibarra224 points·6 months ago

never post a calculation as advice without stating the concentration

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u/cesar_ivaturi147 points·6 months ago

Not to be pedantic but reconstitution and dead space are being used interchangeably and they are not interchangeable in real life.

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u/georgi_adebayo100 points·6 months ago

Not to be pedantic but reconstitution and dead space are being used interchangeably and they are not interchangeable in real life.

Yes, exactly this, and it is the bit that took me 66 weeks to accept.

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u/india_generic_g165 points·6 months ago

i am begging people to write down the concentration

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u/liv_nkemeluOP353 points·6 months ago

Are you using a u-100 or u-40 syringe? That changes everything.

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u/ahmed_rasmussen218 points·6 months ago

show your working or it is unhelpful

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u/india_generic_g98 points·6 months ago

What was the vial size and how much bac water?

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u/dilara_szabo37 points·6 months ago·edited

swirl, do not shake, or you are courting oxidation

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u/oskar_ibarra153 points·6 months ago

Small correction: the trial was 11 weeks, not 7. Does not change your point but people will quote it.

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u/liv_nkemeluOP132 points·6 months ago

This is the "correlation is mechanism" thing again. You changed three variables at once.

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u/ines_ekstrom195 points·6 months ago

Small correction: the trial was 19 weeks, not 29. Does not change your point but people will quote it.

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u/karl_fischer_kev278 points·6 months ago·edited
this is the third time this week and i love it every time
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u/escrow_evangelist81 points·6 months ago

Disagree. What you are describing is consistent with mg/mL, not with what you concluded.

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u/kavya_radich244 points·6 months ago

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

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u/rasmus_kuipers190 points·6 months ago

The single most useful thing I did was write the concentration on the vial. Stopped all the confusion after that.

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u/piotr_bruun166 points·6 months ago·edited

This is correct. 3mL versus 9mL is the common mistake.

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u/honest_syringe_maybe113 points·6 months ago·edited

No. This is the kind of confident post that gets copied into a screenshot and repeated for years. Where is the evidence.

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u/dexa_twice_yearlybody comp163 points·6 months ago

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

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u/ines_ekstrom105 points·6 months ago

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

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u/dilara_szabo158 points·6 months ago·edited

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

Disagree on that part. 98.7% and 98.3% on the same vial is normal.

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u/escrow_evangelist80 points·6 months ago

Is that 15mg vial or 39mg?

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u/hub_opssite staff87 points·6 months ago·edited

Crossposting this to c/survodutide because the people who need it are not reading this community.

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u/cesar_ivaturi53 points·6 months ago

swirl, do not shake, or you are courting oxidation

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u/liv_nkemeluOP20 points·6 months ago

The single most useful thing I did was write the concentration on the vial. Stopped all the confusion after that.

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u/bac_water_banditreconstitution42 points·6 months ago
batch number?
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u/runa_grimaldi61 points·6 months ago

dead space is real and the syringe matters

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About c/reconstitution

The arithmetic and the technique. Bacteriostatic versus sterile water, reconstitution volume as a concentration choice, converting mg/mL into insulin-syringe units, dead space, swirl-not-shake, stopper coring, and how long a reconstituted vial is actually good for. Math errors get corrected fast and politely.

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