Dilution/BAC Water

There really is not one exact amount of BAC water that has to be used for every vial. A lot of it comes down to how concentrated you want it and how easy you want the math to be.

Personally, with Reta I like to keep it a little more concentrated because that means less fluid to inject. I usually keep it simple like this:

10 mg = 1 mL BAC water
20 mg = 2 mL BAC water
30 mg = 3 mL BAC water

That keeps everything at 10 mg per mL. On a U-100 insulin syringe, 10 units would equal 1 mg.

Your pharmacy mixture was just less concentrated if 2.5 mg came out to 50 units. That does not mean it was wrong. It just means you had to inject more liquid to get the same amount.

You could put only 1 mL into a 20 mg vial, but then it becomes much more concentrated and the measurements get smaller. That can make it easier to make a mistake. I personally think 10 mg per mL is a good balance because it keeps the amount of fluid lower while still making the math easy.

Tirz can be handled the same way as far as concentration goes. The biggest thing I always tell people is not to focus only on syringe units. Always know how many milligrams are in the vial and how much BAC water was added, because the same number of units can mean completely different amounts depending on how it was mixed.

If it came directly from a compounding pharmacy, I would still follow the pharmacy’s instructions since they may use a different concentration.

Thank you for your great response. I’m not using from compounding pharmacy any longer way too ex. I was just curious what others were doing, I have zero issues with a higher concentration however I feel like it could affect some people. I also wonder if it might be absorbed better with more BAC if that makes sense. I like your rule of thumb for BAC may have to incorporate that.