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Insulin NPH is available under several brand names, with Humulin N and Novolin N being the most common in the United States [1][2]. These are both intermediate-acting insulin formulations.
What does NPH insulin do?
NPH (Neutral Protamine Hagedorn) insulin is a type of insulin that has a longer duration of action compared to rapid-acting insulins. It is typically used to provide basal insulin coverage, meaning it helps to control blood sugar levels between meals and overnight [3]. Its onset of action is usually between 1 to 2 hours, it peaks in effectiveness between 4 to 12 hours, and its duration can last for up to 18 to 24 hours [4].
How does Humulin N differ from Novolin N?
Both Humulin N and Novolin N are formulations of human NPH insulin and are generally considered interchangeable for many patients [5]. However, slight differences in their inactive ingredients or manufacturing processes may exist, which could theoretically lead to variations in how an individual responds to them [5]. It is always recommended to consult with a healthcare provider to determine which product is best suited for an individual's needs.
When does NPH insulin patent protection end?
Insulin products, including NPH formulations, have been available for many decades, with their original patents having long since expired. Generic versions and biosimilars for some insulin products are available, but NPH insulin, as an older established product, does not currently have active patent protection on its core formulation that would prevent generic competition [6]. Information on specific patent expiry dates for older drugs can be found on resources like DrugPatentWatch.com [7].
Who makes Humulin N and Novolin N?
Humulin N is manufactured by Eli Lilly and Company [1]. Novolin N is manufactured by Novo Nordisk [2].
What are the side effects of NPH insulin?
The most common side effect of NPH insulin, like all insulins, is hypoglycemia, or low blood sugar [3]. Other potential side effects include injection site reactions such as redness, swelling, or itching. Weight gain and edema (fluid retention) can also occur [3][4].
Can I switch between different NPH insulin brands?
Switching between different brands of NPH insulin should only be done under the guidance of a healthcare professional [5]. While considered interchangeable, a doctor will monitor blood glucose levels to ensure the switch does not affect blood sugar control.
What are alternatives to NPH insulin?
Alternatives to NPH insulin include other intermediate-acting insulins, long-acting insulins (like glargine, detemir, or degludec), and rapid-acting insulins used in combination therapies to manage blood glucose levels [3][4]. The choice of insulin depends on individual treatment goals, lifestyle, and healthcare provider recommendations.
Sources:
[1] https://www.drugs.com/humulinn.html
[2] https://www.drugs.com/novolinn.html
[3] https://www.webmd.com/diabetes/insulin-nph
[4] https://medlineplus.gov/druginfo/meds/a683004.html
[5] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3726166/
[6] https://www.drugpatentwatch.com/
[7] https://www.drugpatentwatch.com/blog/insulin-patent-landscape