Insulin aspart, sold under the brand name Novolog, among others, is a modified type of medical insulin used to treat type 1 and type 2 diabetes. It is generally used by injection under the skin but may also be used by injection into a vein. Maximum effect occurs after about 1–3 hours and lasts for 3–5 hours. Generally a longer-acting insulin like insulin NPH is also needed.
Common side effects include low blood sugar, allergic reactions, itchiness, and pain at the site of injection. From Wikipedia
