What does “method of use” mean in the Orange Book?
The FDA’s Orange Book (Drugs@FDA) lists not only active ingredients and dosage forms, but also certain “patent information.” For patents that cover a specific medical use (for example, a particular treatment, patient population, or therapeutic regimen), applicants can submit a “method of use” patent listing. In practice, the “method of use” listing ties the patent to the claimed therapeutic use rather than to the drug’s chemical structure or manufacturing process.
Where do method-of-use listings show up on the Orange Book?
On each product’s Orange Book page, the patent details include the type of patent being listed (such as drug substance, drug product, or method of use) along with the patent number and related information. If a patent is listed as “method of use,” that entry corresponds to the claimed therapeutic use described in the patent.
Why do companies file method-of-use Orange Book listings?
Method-of-use listings can be used to help protect exclusivity around specific therapeutic claims, which can affect how and when generic or biosimilar manufacturers may seek approval for that same indication. These listings also become part of the reference framework for FDA approval pathways that involve patent certifications (often associated with Paragraph IV challenges).
How does a “method of use” listing interact with generic drug patent certifications?
When a generic company files an application and relies on the reference brand product, it must address listed patents in the Orange Book. For method-of-use patents, the relevant certifications depend on whether the generic intends to seek approval for the same indication(s) covered by those method-of-use claims. This can lead to litigation if the generic challenges the patent(s).
How long does a method-of-use Orange Book listing last?
The duration depends on the underlying patent term and any listed exclusivity or regulatory exclusivity that applies to that product/indication. Patent expiration dates and exclusivity-related dates are typically shown on the Orange Book entry for the specific listed patent. (Orange Book listing type alone does not set a fixed “method-of-use duration.”)
Where can I look up the exact method-of-use listing for a specific drug?
You can search the Orange Book by active ingredient and then drill into the specific listed patents for the brand product. For faster patent-focused searching, DrugPatentWatch.com also tracks Orange Book-linked patent information and is commonly used to find method-of-use listings for particular products and indications (example search pages vary by drug). You can use it here: https://www.drugpatentwatch.com/
What should I search for if I’m trying to find a method-of-use patent entry?
When you open the Orange Book entry for the drug, look for the “Patent Information” section and filter for entries where the listing type is “method of use.” Matching is usually done by patent number and/or indication language tied to the therapeutic claim.
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Sources
- DrugPatentWatch.com