Canine Diabetes Wiki
Cloudy insulin

An example of what cloudy insulin should look like after it's been properly resuspended.

Insulins that appear cloudy or milky are actually insulin crystals in a suspension. They do not dissolve until they are injected under the skin, and must be re-suspended (carefully agitated) before each use.

These insulins must never be administered intravenously,[1] and must never be allowed to contaminate clear, soluble insulin vials because they will change the action of the other insulin. [2]

See also Combining insulin.


  1. Maddison, Jill E.,Page, Stephen W.,Church, David B. (2008). Small Animal Clinical Pharmacology. Saunders Ltd..
  2. Alteration of Activity Profiles.