Mixing and storage

Add 2 mL of bacteriostatic water to a 10 mg vial, slowly down the glass, and swirl until clear. That gives 5 mg per mL, so 2.5 mg is 0.5 mL, or 50 units, and 5 mg is 1 mL, or 100 units on a U-100 syringe. A 50 mg vial is mixed with 3 mL, giving about 16.7 mg per mL, so 5 mg is 30 units. Before mixing keep it cool and dark; after mixing keep it in the fridge at 2 to 8 C and use within 28 days.