When you are mixing types of insulin to be given in one syringe, follow these precautions.

• If you are mixing NPH and short-acting regular insulin, you can use it right away or refrigerate it to be used later.
• Insulin glargine (Lantus) and insulin detemir (Levemir) cannot be mixed with other types of insulin. They also cannot be given in a syringe that has been used to give another type of insulin.
• Lente insulin should not be mixed with regular insulin.

Do not mix human- and animal-source insulins in the same syringe.