I combine both substances ahead of time inside a fresh sterile container or load them into a pen cartridge. Doing it this way means they stay blended with the proportions I picked.
Folks, I'm wondering how to load both these solutions into a single needle without running into problems. Each one came at ten milligrams dissolved in two milliliters of bacteriostatic water. Drawing up the first at point zero five milliliters goes okay, yet forcing the second one afterward meets resistance and won't enter smoothly. A little bead sometimes shows up on the rear of the needle and could fall away. I'm also concerned about accidentally mixing material between the two containers. What's a reliable method for getting both in there together?