Diabetes in Pets
Iletin I R
R,Neutral by Eli Lilly
short-acting Bovine
U100 none
Line Iletin
Also known as beef R, beef neutral
Similar to  
Action in cats  
  • onset Xh,
  • peak Xh
  • duration Xh
Action in dogs  
  • onset 10-30 minutes,
  • peak 1-5h,
  • duration 4-10h
Use and Handling
Type soluble
Shelf Life 24 months
When opened 28 days room temp.
In pen N/A

North American brand name for Eli Lilly's 100% bovine AND bovine/porcine mix insulins[1]. This is the "R"/neutral or soluble type; many more types were also produced.

Like all R or neutral insulins, nothing is added (suspensions) to alter the insulin's action or speed[2]. There are no beef/pork mixed R/neutral insulins on the market today--they are all either pure pork or pure beef.

The pure beef Iletin I R is equivalent to Hypurin Bovine Neutral[3], Hypurin Vet Neutral[4][5][6] and Insuvet Neutral[7].