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Note: This document contains side effect information about insulin isophane. Some of the dosage forms listed on this page may not apply to the brand name Humulin N.For the Consumer
Applies to insulin isophane: subcutaneous suspension, subcutaneous suspension pen-injectorWhat are some side effects that I need to call my doctor about right away?
WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:
All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:
These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.
You may report side effects to the FDA at 1-800-FDA-1088. You may also report side effects at http://www.fda.gov/medwatch.For Healthcare Professionals
Applies to insulin isophane: subcutaneous suspensionCardiovascular
Frequency not reported: Sodium retention and edema
Insulin may cause sodium retention and edema, especially with intensified insulin therapy. Combination use with thiazolidinediones has resulted in fluid retention which has led to or exacerbated heart failure.Dermatologic
Long-term use of insulin can cause lipodystrophy at the site of repeated insulin injections. Lipodystrophy includes lipohypertrophy (thickening of adipose tissue) and lipoatrophy (thinning of adipose tissues).
Uncommon (0.1% to 1%): LipodystrophyGeneral
The most common adverse reactions reported with this insulin include hypoglycemia, allergic reactions, injection site reactions, lipodystrophy, weight gain, and edema.Hypersensitivity
Hypersensitivity side effects have included both local and systemic reactions. These reactions are becoming rare (less than 1% of patients) due to the use of purer forms of pork insulin or biosynthetic human insulin. Local reactions have presented as erythema, swelling, heat, or subcutaneous nodules. They usually occurred within the first two weeks of therapy and then disappear. True allergy to insulin has been rare, and sensitization was usually associated with specific animal proteins in bovine and less pure forms of porcine insulins.
Uncommon (0.1% to 1%): Local reactions such as redness, swelling, or itching at the injection site
Very rare (less than 0.01%): Anaphylactic reactionsImmunologic
Frequency not reported: Formation of anti-insulin antibodies
Increases in titers of anti-insulin antibodies that react with human insulin have been observed; some data indicates the increase is transient. The clinical significance of these antibodies is unknown; it does not appear to cause deterioration in glycemic control.Metabolic
Very common (10% or more): Hypoglycemia
Rare (less than 0.1%): Insulin resistance
Frequency not reported: Hypokalemia, hyperglycemia, diabetic ketoacidosis, hyperosmolar hyperglycemic non-ketotic syndrome, hypomagnesemia, hypophosphatemia
Hypoglycemia is the most common adverse reaction of all insulin therapies. The timing of hypoglycemia generally reflects the time-action profile of the administered insulin, however, the time action profile of any insulin may vary considerably in different individuals or at different times in the same individual depending on dose, site of injection, blood supply, temperature, and physical activity. Other factors such as changes in food intake (timing of meals, amount or type of food) and concomitant medications will also affect the risk of hypoglycemia.
Hypokalemia, which is due to a shift in potassium from the extracellular to the intracellular space, occurs with all insulins. Hypokalemia and hypomagnesemia has been reported, particularly in patients treated for diabetic ketoacidosis (DKA). Insulin increases the intracellular transport of phosphate, which often results in hypophosphatemia during treatment of DKA. In situations in which not enough insulin is available to control blood glucose, hyperglycemia, diabetic ketoacidosis, and hyperosmolar hyperglycemic non-ketotic syndrome may occur.Ocular
Frequency not reported: Transitory, reversible ophthalmologic refraction disorder, worsening diabetic neuropathy
Transitory, reversible ophthalmologic refraction disorder and worsening of diabetic retinopathy has been reported with insulin initiation and glucose control intensification. Over the long-term, improved glycemic control decreases the risk for diabetic neuropathy.Local
Injection site reactions including pain, redness, hives, inflammation, bruising, swelling, and itching have occurred. These usually resolve in a few days to a few weeks; rotation of the injection site reduces the risk of these reactions developing.
Common (1% to 10%): Injection site hypertrophy
Frequency not reported: Injection site reactionsNervous system
Frequency not reported: Acute painful peripheral neuropathy
Acute painful peripheral neuropathy has been reported with insulin initiation and glucose control intensification. Over the long-term, improved glycemic control decreases the risk for neuropathy.Other
Frequency not reported: Weight gain
Weight gain can occur with insulin use; it is believed to be due to the anabolic effects of insulin and the decrease in glycosuria.
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