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Glargine Insulin for Veterinary Use

Veterinary: Order Online Now
Pet Owners: Pick Up and Fill a New Prescription

by Barbara Forney, VMD  

Overview

Therapeutic Class:  Synthetic insulin analogue

Species:  Dogs and cats

May Be Prescribed by Vets for:
Diabetes Mellitus

FDA Status:  No FDA-approved veterinary products.

Basic Information

Glargine insulin is a synthetic insulin analogue which is used in human medicine as a long-acting, “peak-less” insulin. It is administered subcutaneously once a day in humans and maintains a constant systemic absorption profile for 24 hours. Additionally, a short-acting insulin may be used before meals to further optimize glycemic control.

Glargine insulin is completely soluble at a low pH. When it is injected subcutaneously it forms a microprecipitate in the subcutaneous space. This allows for relatively constant and prolonged absorption. Glargine insulin can not be mixed with other insulin because it would change the pH and the mechanism of absorption.

Dogs and Cats

Diabetes Mellitus is a relatively common metabolic disease seen in middle aged cats and dogs. Most dogs suffer from Type 1 diabetes, while cats usually have Type 2 diabetes. Type 3 diabetes may occur in either cats or dogs. In addition to treatment with insulin, the veterinary management of diabetes requires owner education, dietary management, and regular glucose testing. With appropriate management, most animals can live a normal lifespan.

In healthy cats, the duration of action for glargine insulin is 23 +0.9 hours. Diabetic cats may be maintained on once a day injection, although some cats may be better controlled with twice a day injection. It appears that glargine insulin is particularly useful in the treatment of the newly diagnosed, diabetic cat as some of these cats are able to achieve a diabetic remission.

Glargine insulin has not been as well studied in the dog as it has in the cat.

Side Effects

Hypoglycemia: The initial signs of hypoglycemia include nervousness, vocalization, anxiety, muscle tremors, ataxia, and pupillary dilation. The alert owner may be able to offer the patient some food or oral dextrose to counteract the hypoglycemia. Positive response should occur within one or two minutes. More severe signs of hypoglycemia include seizures, shock and coma. These animals require prompt veterinary intervention.

Precautions

  • Urinary tract infections are a common secondary problem in cats with diabetes.
  • Intact female cats should be neutered because the increased progesterone with diestrus makes the management of diabetes more difficult.
  • Dietary changes can affect insulin requirements.
  • Insulin may be used in pregnant animals, although breeding animals with diabetes is generally discouraged. Insulin may be used in lactating animals.
  • Injection site reactions may occur. It is important to use multiple sites.

Drug Interactions

  • There are multiple drug interactions with insulin.
  • Drugs which may increase the hypoglycemic activity of insulin include: captopril, enalpril, alcohol, anabolic steroids, beta-adrenergic blockers, MAOI’s, guanethidine, phenylbutazone, sulfinpyrazone, sulfonamides, tetracycline, and aspirin or other salicylates.
  • Drugs which may decrease the hypoglycemic activity of insulin include: dextrothyroxine, dobutamine, epinephrine, estrogen/progesterone combinations, furosemide, glucocorticoids, isoniazide, phenothiazine derivatives, and thiazide diuretics.
  • Thyroid hormones may increase blood glucose levels. When thyroid hormone is begun in a diabetic, hypothyroid patient, additional monitoring should be considered.
  • Topical glucocorticoids can alter glucose levels in the diabetic patient and should be avoided if possible.
  • Insulin can change serum potassium levels. Patients receiving digoxin and those on diuretics should receive additional monitoring of serum potassium levels.

Overdose

Overdose with insulin will lead to varying degrees of hypoglycemia. Description of mild hypoglycemia is included with the side effects. More severe hypoglycemia can lead to seizures, blindness, cerebral edema, permanent brain damage, coma and death.

About the Author

Dr. Barbara Forney is a veterinary practitioner in Chester County, Pennsylvania. She has a master's degree in animal science from the University of Delaware and graduated from the University of Pennsylvania School of Veterinary Medicine in 1982.

She began to develop her interest in client education and medical writing in 1997. Recent publications include portions of The Pill Book Guide to Medication for Your Dog and Cat, and most recently Understanding Equine Medications published by the Bloodhorse.

Dr. Forney is an FEI veterinarian and an active member of the AAEP, AVMA, and AMWA.

You can purchase books by Dr. Forney at

The information contained on this site is general in nature and is intended for use as an informational aid. It does not cover all possible uses, actions, precautions, side effects, or interactions of the products shown, nor is the information intended as medical advice or diagnosis for individual health problems or for making an evaluation as to the risks and benefits of using a particular product. You should consult your doctor about diagnosis and treatment of any health problems. Information and statements have not been evaluated by the Food and Drug Administration ("FDA"), nor has the FDA approved the products to diagnose, cure or prevent disease.

Wedgewood Pharmacy's compounded veterinary preparations are not intended for use in food and food-producing animals.

Wedgewood Pharmacy is licensed by the New Jersey State Board of Pharmacy.

405 Heron Drive, Suite 200
Swedesboro, NJ 08085-1749 | © 2004-2015 Wedgewood Pharmacy, All Rights Reserved.

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