Humulin R (Insulin)

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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


    HUMULIN R is a prescription drug given to treat high blood sugar (hyperglycemia) in people with diabetes mellitus. It can treat hyperglycemia in type 1 or type 2 diabetes.

    People with diabetes mellitus have abnormal levels of insulin, and HUMULIN R helps to regulate their blood sugar. Blood sugar that is too high can cause organ damage, and blood sugar that is too low can be life-threatening.


    Inject HUMULIN R insulin under the skin 30 minutes before meals. Do not skip a meal after taking a dose.

    Store unopened vials in the refrigerator. Opened vials can be stored at room temperature for 28 days before discarding.


    The active ingredient in HUMULIN R is regular short-acting human insulin.


    Insulin does not have any drug interactions with other medications. However, many different drugs can affect people with diabetes mellitus by raising or lowering their blood sugar. Tell your doctor if you are taking any of the following:

    • Alcohol
    • Atypical Antipsychotics
    • Beta-blockers
    • Clonidine
    • Corticosteroids
    • Disopyramide
    • Diuretics
    • Estrogens/Progesterones
    • Fibrates
    • Fluoxetine
    • Isoniazid
    • Lithium
    • Monoamine Oxidase Inhibitors (MAOIs)
    • Niacin
    • Oral antidiabetic agents
    • Pentoxifylline
    • Phenothiazine derivatives
    • Pramlintide
    • Propoxyphene
    • Protease inhibitors
    • Salicylates
    • Somatostatin Analogues
    • Somatropin
    • Sulfonamide Antibiotics
    • Sympathomimetic agents
    • Thyroid replacement medication


    Insulin treatment can cause dangerously low blood sugar (hypoglycemia), which can be a medical emergency. Monitor your blood sugar frequently while using insulin.

    Tell your doctor if you have a history of low potassium (hypokalemia).

    Changes to your diet, meals, medications, and other lifestyle changes may impact the dose of insulin you need.

    Side Effects

    The most common side effects of HUMULIN R can include:

    • Allergic reactions
    • Edema
    • Hypoglycemia
    • Injection site reactions
    • Lipodystrophy
    • Pruritis
    • Rash
    • Weight gain


    1. Humulin R [package insert].Indianapolis, IN: Lilly; 2019.

    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 : 13360

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