Those come as a pre-filled syringe. Each one would be a single use. After reconstituting with bacteriostatic water that is contained within the syringe, that is when you have 24 hours to use it. In powder form, they can last for 3 months in the refrigerator. The strength of dosage that you can buy ranges from 0.2mg to 2.0mg. IUs aren't an exact form of measurement. For example, 1 IU of insulin does not equal the same volume of 1 IU of growth hormone so without more information from the actual package insert, it's hard to know how many IU you have.