Mixing and storage

Add 2 mL of bacteriostatic water to a 5 mg vial, slowly down the side of the glass, and swirl until clear. That gives 2.5 mg per mL, so 0.25 mg is 0.1 mL, or 10 units on a U-100 syringe. A 10 mg vial with 2 mL gives 5 mg per mL. Before mixing keep it cold and dark, in the freezer for long storage; after mixing keep it in the fridge at 2 to 8 C, use within 28 days and never freeze it.