Insulin
Also known as: Vetsulin, Caninsulin, ProZinc, Humulin, Novolin, Lantus, Levemir, Humalog
Managing a diabetic pet requires commitment, but it becomes a routine part of daily life. Here are critical points for success: * **Storage:** Keep insulin in the refrigerator. **Do not freeze it** or leave it in a hot car, as extreme temperatures destroy the protein. Allow the drawn-up syringe to reach room temperature before injecting to reduce discomfort. * **Handling the Vial:** Gently roll the vial between your palms to mix it. **Do not shake vigorously** (unless specifically instructed by your vet for certain brands like Vetsulin), as this can damage the insulin molecules. * **Syringe Safety:** Always use the correct syringe! **U-40 syringes (red cap)** are for U-40 insulin (like Vetsulin or ProZinc). **U-100 syringes (orange cap)** are for U-100 insulin (like Glargine or NPH). Mixing these up can cause a fatal overdose. * **Injection Technique:** Give the injection under the skin (subcutaneously). **Rotate injection sites** daily (e.g., left side of chest, right side of chest, left flank, right flank) to prevent hard lumps from forming under the skin, which block insulin absorption. * **Hypoglycemia (Low Blood Sugar):** This is an emergency. Watch for weakness, stumbling, trembling, staring into space, or seizures. If this happens, immediately rub **Karo syrup (corn syrup)** or honey on your pet's gums and call your veterinarian. Do not put your fingers in a seizing pet's mouth. * **Travel:** When flying, keep insulin in your carry-on. A single pass through the X-ray is fine, but avoid repeated exposures.
Dosage must be set by your veterinarian for your specific pet. Never give human medication or another pet’s prescription without veterinary guidance.
What it is used for
- Diabetic ketoacidosis (Regular insulin)
- Diabetic ketoacidosis (Glargine)
- Severe hyperkalemia
- Uncomplicated diabetes mellitus (Glargine, Detemir, or PZI)
- Uncomplicated diabetes mellitus (ProZinc)
- Uncomplicated diabetes mellitus (Vetsulin)
- Uncomplicated diabetes mellitus (Lente)
- Diabetes mellitus
- Adjunctive treatment of ketosis
- Diabetes mellitus
- Hyperlipemia in ponies
- Diabetes mellitus
- Diabetic ketoacidosis (Intermittent IM technique)
How it is given
Possible side effects
- Hypoglycemia (most common and potentially life-threatening)
- Insulin-induced hyperglycemia ('Somogyi effect' due to counter-regulatory hormone release following hypoglycemia)
- Insulin antagonism or resistance
- Rapid insulin metabolism
- Local hypersensitivity reactions to 'foreign' proteins
- Lipodystrophy at the injection site (if sites are not rotated)
Cautions & contraindications
- Episodes of hypoglycemia (absolute contraindication)
- Systemic allergy to pork or pork products (specifically for Vetsulin/porcine lente)
- Because there are no alternatives for insulin in diabetic indications, there are no absolute contraindications except during hypoglycemia. * **Antibody Formation:** Beef/pork insulin produces antibody formation in ~45% of dogs, leading to erratic control. Pork insulin is identical to canine insulin and is preferred. Cats have a low incidence of antibody production regardless of source. * **Injection Site:** Do not inject at the exact same site day after day to prevent lipodystrophic reactions. * **Prescription Safety:** Do NOT abbreviate Units as 'U', as it significantly increases the rate of transcription and fatal dosage errors (often misread as a zero).
Drug interactions
- Beta-adrenergic blockers (e.g., propranolol): Can have variable effects on glycemic control and can mask the clinical signs associated with hypoglycemia.
- Clonidine, Reserpine: Can mask the signs associated with hypoglycemia.
- Digoxin: Insulin alters serum potassium levels; concurrent use requires close monitoring for cardiac arrhythmias, especially with concurrent diuretics.
- Alcohol, Anabolic steroids, ACE inhibitors, Aspirin, Disopyramide, Fluoxetine, MAOIs, Somatostatin derivatives, Sulfonamides: May potentiate the hypoglycemic activity of insulin.
- Calcium channel blockers, Corticosteroids, Danazol, Diuretics, Isoniazid, Niacin, Phenothiazines, Thyroid hormones: May decrease the hypoglycemic activity of insulin (cause insulin resistance).
Frequently asked questions
What is Insulin used for in pets?
Managing a diabetic pet requires commitment, but it becomes a routine part of daily life. Here are critical points for success: * **Storage:** Keep insulin in the refrigerator. **Do not freeze it** or leave it in a hot car, as extreme temperatures destroy the protein. Allow the drawn-up syringe to reach room temperature before injecting to reduce discomfort. * **Handling the Vial:** Gently roll the vial between your palms to mix it. **Do not shake vigorously** (unless specifically instructed by your vet for certain brands like Vetsulin), as this can damage the insulin molecules. * **Syringe Safety:** Always use the correct syringe! **U-40 syringes (red cap)** are for U-40 insulin (like Vetsulin or ProZinc). **U-100 syringes (orange cap)** are for U-100 insulin (like Glargine or NPH). Mixing these up can cause a fatal overdose. * **Injection Technique:** Give the injection under the skin (subcutaneously). **Rotate injection sites** daily (e.g., left side of chest, right side of chest, left flank, right flank) to prevent hard lumps from forming under the skin, which block insulin absorption. * **Hypoglycemia (Low Blood Sugar):** This is an emergency. Watch for weakness, stumbling, trembling, staring into space, or seizures. If this happens, immediately rub **Karo syrup (corn syrup)** or honey on your pet's gums and call your veterinarian. Do not put your fingers in a seizing pet's mouth. * **Travel:** When flying, keep insulin in your carry-on. A single pass through the X-ray is fine, but avoid repeated exposures.
Is Insulin safe for my pet?
Dosage must be set by your veterinarian for your specific pet. Never give human medication or another pet’s prescription without veterinary guidance.
This article is for general education and is not a substitute for professional veterinary advice. If your pet is unwell, please consult a veterinarian.
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