When my vial ran empty too soon

Three doses from a vial (the small bottle containing the powder), then it was done. There should have been another half portion left - my calculator said 36 units (the tiny markings on an insulin syringe, which I use to measure how much solution I draw up), but in reality there were barely 20. I stood in the kitchen, syringe in hand, thinking: Did I make a mistake?

What was going on?

The answer was more mundane than I feared. When mixing - that is, dissolving the powder in the vial with water - I had apparently used too little BAC water. BAC water is special, sterile water that I need for exactly this step. It was probably because I wasn't yet confident reading the markings on the syringe: is that the edge of the water or the edge of the syringe head? Think of it like making tea with less water: the solution gets much stronger. Each of my tirzepatide doses (tirzepatide is a peptide medication used, among other things, for weight loss and diabetes; I source it through the gray market, which is why I mix it myself at home from powder and sterile water) was inadvertently a bit larger than planned. And that's why the vial was empty sooner than expected.

The remaining 20 units, I injected after the usual seven days. Throwing them away wasn't a real option for me. But I wanted to know: What had I actually been getting per dose - and how do I continue cleanly?

Why I noticed at all

And here's the point that matters to me: that I noticed the difference between expected and actual at all wasn't due to good instincts. It was because I keep a clean record in the Injection Manager - what, when and how much I injected. Without that tracking, I could never have compared expectation to reality.

The Manager is my first step: log what happens. And when - as in my case - something doesn't add up, the second step comes in: the Reverse Dose Calculator. It works backwards from the original amount of active ingredient and what was left over, calculating exactly what was in each individual dose. In my case, the result was: my doses were actually a bit higher than intended. No drama - but exactly the kind of difference you want to know about.

What I learned

• Logging isn't optional. Without clean records, I'd never have noticed the error.
• When mixing, it pays to look closely. Where does the BAC water (the sterile water used to dissolve the powder) end, where does the air begin? A few units make a real difference.
• A vial that's empty too soon isn't a reason to panic. If you've kept records, you can calculate everything back.

I'm sharing this because exactly these kinds of small mishaps can cost you hours of uncertainty. And because I know how quickly you start doubting yourself. If you've experienced something similar, reach out via contact or report your experience.

This isn't medical advice and not a recommendation to do anything the way I did. It's simply my story - as I experienced it.

- Samuel