We are currently experiencing shortages of D50% premix syringes, intermittent shortages of D70%. Our current practice is to make our own syringes of D50% from either a D50% 500mL bag we are able to acquire, or by diluting D70% with SWFI. The D50% syringes may be difficult to store in the fridge (little data on fridge storage at that concentration), so we send out from the pharmacy via the pneumatic tube or hand delivery when nursing calls for a hypoglycemic patient.
Here is my compounding formula for making D50% from D70% and SWFI (rounded to nearest 1 mL on the figures)
COMPOUNDING (#20 syringes): add 714 mL of D70w to 286 mL of SWFI in a sterile empty container to make 1000 mL of D50w stock solution. Further unit dose this solution into 50 mL syringes.
COMPOUNDING (#10 syringes): add 357 mL of D70w to 143 mL of SWFI in a sterile empty container to make 500 mL of D50w stock solution. Further unit dose this solution into 50 mL syringes