| Iletin I Lente | |
|---|---|
| Lente by Eli Lilly | |
| intermediate-acting | |
| Bovine 85% Porcine 15% | |
| U100 | Zinc |
Action in dogs:
| |
| Line: Iletin | |
| Also known as: | |
| Similar to: Lentard MC | |
| Use and Handling: | |
| Shelf Life: 24 months | Type: cloudy |
| When Opened: 28 days room temp. | |
| In Pen: N/A | |
| Notes: Protect from light and heat Do Not Freeze, Re-suspend Do not use if product does not re-suspend Do not use intravenously [1] See Insuvet Lente , Hypurin Bovine Lente or Betasint Bovine Lente for current handling information for beef lente insulin. | |
 Iletin I Lente beef/pork insulin. The insulin was discontinued by Lilly in 1998. |
 Lilly insulin products-1992. This insulin is shown as Iletin I Lente. |
|
Note that some countries have the brand name in U40 strength. | ||
Eli Lilly's old product [2]--an 85%% bovine, 15% porcine lente insulin which is intermediate-acting.
Current nearest equivalents are: Hypurin Bovine Lente [3][4] by CP Pharma and Betasint Bovine Lente by Beta Laboratorios. [5]
It shared the Lente composition [6] definition of being a suspension of crystalline (ultralente) and amorphous (semilente) insulin in a ratio of 7 crystalline parts to 3 amorphous parts.[7]
Why Lente doesn't equal 70/30[]
Direct comparison of insulin activity profiles for Lente and 70/30 insulins. The early strong action from the non-suspended R/neutral/normal insulin is seen at the "bump" from hours 0-6.
Let's look at the differences in the two insulins. Lente is comprised of 70 % long-acting Ultralente insulin and 30% short-acting Semilente insulin. So proportions of a long-acting and short-acting insulin are being combined to produce a intermediate-acting insulin. Both Ultralente and Semilente insulin are suspended by adding zinc and the size of their respective insulin crystals. The largest insulin crystals are those of Ultralente, while Semilente contains the smallest, or microcrystals. Simply put, you're combining a long insulin and a short insulin to make an intermediate-acting one.[8]
70/30 insulin starts with 70% NPH/isophane insulin, an intermediate-acting insulin which is suspended by protamine. To that, 30% R/neutral/normal insulin, which is short-acting and soluble, meaning there is no suspension; nothing is added to this insulin to delay its action. In this case, you are taking an intermediate-acting insulin with a suspension and adding to it a short-acting one with no suspension to create an intermediate-acting insulin.
So we have an insulin (Lente), made up of a long-acting and short-acting insulin, both with zinc suspensions, and a mixed insulin (70/30), made from an intermediate-acting protamine suspended insulin and a short-acting one without any suspension. Because of these differences, the insulin action profile for these two insulins is going to be quite different, even though both insulins are classed as intermediate-acting.
What Lente Is Not[]
No Lente-type insulin regardless of species can contain any NPH/isophane insulin [9] or any R/Neutral insulin. [10][11]
Both are chemically impossible: the phenol preservative present in NPH/isophane alters the action of Lente-type insulins, creating a mixture with an approximate action of R/Neutral. [12][13]
The zinc suspension of Lente-type insulin binds R/Neutral, causing the short-acting insulin to slow, losing its short-acting effect. [14][15]
Before the invention of VetPen, Lente-type insulins could not be dispensed in pen or cartridge form because the glass ball formerly used to mix the insulin in these devices shattered the Lente crystals.[16]
Combining Lente Family Insulins[]
Insulin manufacturers [17] indicate that R/neutral and semilente, Lente, ultralente insulins are able to be combined in the same syringe, but only just before injection. In pre-filled syringes, the zinc suspension of the Lente-type insulins binds the R/neutral, causing it to lose its short-acting effect. Various studies have documented this, and some doctors advise against using R/neutral in the same syringe with the Lente family of insulins. [11][18][19][20]
|
None of the Lente family of insulins (semilente, Lente, Ultralente) can be combined with [21] NPH/isophane insulins. The phenol preservatives present in NPH-type insulins alters the Lente-types to the point where they become a close approximation of R/neutral, with regard to action. [22][20] Keeping the phenol preservatives in mind, all protamine-suspended insulin mixes would be "off limits" regarding same syringe mixing with any Lente-type insulins. [20] | ||
|
Lente Insulins | |
|---|---|
|
Intermediate acting Non-soluble |
| Betasint Bovine Lente Hypurin Bovine Lente | |
| Iletin Lente (No longer produced.) Beef Lentard (No longer produced.) | |
| Iletin I Lente (No longer produced.) [23] Lentard MC (No longer produced.) | |
| Betasint Porcine Lente, Lente CHO | |
|
Iletin II Lente (No longer produced.) [24] | |
| Monotard, Novolin L (No longer produced.) Huminsulin L, Huminsulin Long Humutard, Humulin L Humulin Lenta, Humulin Lente Humulina L, Humuline Long Umuline Lente, Umuline Zinc Compose (No longer produced.) | |
The following are lente type zinc suspension insulins but since they are produced for use in animals, they are not found in BNF, but in its sister veterinary formulary.
|
Lente Insulins | |
|---|---|
|
|
Intermediate acting Non-soluble |
| Insuvet Lente (No longer produced.) | |
| Caninsulin, Vetsulin | |
These fall into the category of intermediate-length insulins.
The blended beef/pork Iletin I was produced until 1999. [25][26]
References[]
- ↑ Maddison, Jill E.,Page, Stephen W.,Church, David B. (2008). Small Animal Clinical Pharmacology. Saunders Ltd..
- ↑ Discontinuation of Lilly's Iletin I beef/pork line of insulins; Iletin I Lente is at right.. Eli Lilly.
- ↑ Hypurin Bovine Lente Patient Information. Net Doctor uk.
- ↑ Hypurin Bovine Lente. Wockhardt UK.
- ↑ Prescribing Bovine Insulin.
- ↑ Scientific Discussion-Monotard. EMEA.
- ↑ Dumitriu, Severian (2001). Polymeric Biomaterials, Revised and Expanded 1104. CRC Press.
- ↑ Greco, Deborah (2010). Treating Diabetes Mellitus in Dogs and Cats. Western Veterinary Conference.
- ↑ Combining Lente-type Insulins with Phenol-Preserved Insulins. National Federation for the Blind.
- ↑ Lente Zinc Suspension Causes Loss Of R/Neutral Short-Acting Effect. Endotext.org.
- ↑ 11.0 11.1 Huffman DM, Garber AJ. (1991). Availability of Soluble (R/Neutral) Insulin in Mixed Preparations With Crystalline (Lente) & Ultralente GE Insulin. Clinical Therapeutics. Cite error: Invalid
<ref>tag; name "Huffman" defined multiple times with different content - ↑ Lente-Type Insulins & NPH/Isophane Insulins-A Bad Combination. National Federation for the Blind.
- ↑ Havlik I, Galasko G, Alberts E, Furman KI, Seftel HC. (1988). Solubility Changes on Mixing Short- and Long-acting Insulin Preparations. South African Medical Journal.
- ↑ Deckert, T. (1980). Intermediate-Acting Insulin Preparations: NPH (Isophane) & Lente. Diabetes Care.
Note--in 1980, there were no r-DNA/GE/GM insulins - ↑ Resource Guide. American Diabetes Association (2005).
- ↑ Hanas, Ragnar (1999). Insulin-Dependent Diabetes-Page 10. ChildrenWithDiabetes.
- ↑ Insulin Producers vs Doctors Re:Combining R/Neutral & Lente-type Insulins. Endotext.org.
- ↑ Bilo HJ, Heine RJ, Sikkenk AC, van der Meer J, van der Veen EA. (1987). Absorption Kinetics & Action Profiles-Single Subcutaneous Administration of Human Soluble (R/Neutral) & Lente Insulin. Diabetes Care.
- ↑ Heine RJ, Sikkenk AC, Eizenga WH, van der Veen EA. (1983). Delayed Onset of Action of Soluble (R/Neutral) Insulin After Premixing With Lente Insulin Diabetes. Research & Clinical Practice.
- ↑ 20.0 20.1 20.2 Insulin Therapy-Mixing Precautions. RxEd.org. Cite error: Invalid
<ref>tag; name "Rx" defined multiple times with different content Cite error: Invalid<ref>tag; name "Rx" defined multiple times with different content - ↑ Phenol Preservatives & Lente-type Insulins--A Bad Combination. National Federation for the Blind.
- ↑ Lente-Type Insulins & NPH/Isophane Insulins-A Bad Combination. National Federation for the Blind.
- ↑ Iletin I Lente-Beef/Pork Insulin Shown at Right.
- ↑ Carton Image-Iletin II Lente.
- ↑ Iletin Beef/Pork Discontinued. Capsule Report (July 1999).
- ↑ Insulin Update-Discontinuation of Iletin Beef/Pork insulins. Nora Apothecary.
More information[]
- Insulin therapy for dogs and cats Dowling, Patricia, September 1995, Canadian Veterinary Journal
A discussion of Iletin insulins.
- Lente Insulins-Injectable Suspensions West Virginia University College of Pharmacy-2009
Related pages[]
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