What is a Generic Drug?

A generic drug is a copy of the brand-name drug with the same dosage, safety, strength, quality, consumption method, performance, and intended use. Before generics become available on the market, the generic company must prove it has the same active ingredients as the brand-name drug and works in the same way and in the same amount of time in the body.

The only differences between generics and their brand-name counterparts is that generics are less expensive and may look slightly different (eg. different shape or color), as trademarks laws prevent a generic from looking exactly like the brand-name drug.

Generics are less expensive because generic manufacturers don't have to invest large sums of money to develop a drug. When the brand-name patent expires, generic companies can manufacture a copy of the brand-name and sell it at a substantial discount.

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  • Product Details


    VETSULIN (porcine insulin zinc suspension) is a medication given to dogs or cats with diabetes mellitus to treat hyperglycemia (high blood sugar). VETSULIN should only be used by or on the order of a veterinarian. VETSULIN has been approved by the Food and Drug Administration (FDA).

    VETSULIN insulin is available as a vial or as a VETSULIN pen, called VetPen.


    Inject VETSULIN subcutaneously as directed by the veterinarian. The dose will be determined by the veterinarian and depends on several factors, including breed, weight, and other lifestyle factors.

    Resuspend the insulin before administration by gently shaking it until it forms a uniformly white, milky suspension.

    Store VETSULIN in the refrigerator before use. Once opened, VETSULIN can be stored at room temperature for up to 42 days.


    Porcine insulin zinc suspension is the active ingredient in VETSULIN.

    Inactive ingredients include:

    • Hydrochloric acid
    • Methylparaben
    • Sodium acetate trihydrate
    • Sodium chloride
    • Sodium hydroxide
    • Zinc


    There are no known interactions between VETSULIN and other medications.


    Carefully monitor your pet for signs and symptoms of blood sugar that is too high (hyperglycemia) or too low (hypoglycemia).

    An overdose of VETSULIN can cause hypoglycemia, which may be life-threatening.

    Side Effects

    VETSULIN for dogs may cause the following side effects:

    • Cataracts
    • Diarrhea
    • Hematuria
    • Hypoglycemia
    • Injection site reactions
    • Pancreatitis
    • Urinary tract infections
    • Vomiting

    VETSULIN for cats can cause the following side effects:

    • Changes in appetite
    • Dehydration
    • Diarrhea
    • Hypoglycemia
    • Injection site reactions
    • Lethargy
    • Ocular discharge/color change
    • Polyneuropathy
    • Urinary tract disorder
    • Vomiting
    • Weight loss


    1. Vetsulin [package insert] Summit, NJ: Merck; 2012.

    IMPORTANT NOTE: The above information is intended to increase awareness of health information and does not suggest treatment or diagnosis. This information is not a substitute for individual medical attention and should not be construed to indicate that use of the drug is safe, appropriate, or effective for you. See your health care professional for medical advice and treatment.

    Product Code : 13371

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