Short-acting insulin crystallized from the pancreas of animals or synthetically made. This insulin is neutralized and can be premixed with NPH insulin. Also known as clear insulin or crystalline insulin.
short-acting insulin. On average, regular insulin starts to lower blood glucose within 30 minutes after injection. It has its strongest effect 2 to 5 hours after injection but keeps working 5 to 8 hours after injection. Also called R insulin.