What does “Orange Book approved drug products with therapeutic equivalence evaluations” mean?
The U.S. FDA’s Orange Book lists approved drug products and includes regulatory information used to determine whether products are therapeutically equivalent. For generic drugs, the key field users look for is the therapeutic equivalence status (often shown as “A,” “B,” “C,” or “/” depending on the specific situation and whether studies support equivalence). This lets prescribers and dispensers assess whether a generic can be considered interchangeable with a reference listed drug (RLD).
Where can you find the Orange Book entries that include therapeutic equivalence evaluations?
Orange Book records are organized by active ingredient and strength, with each approved product showing listing details, including therapeutic equivalence information for those listings. You typically find these evaluations on the product listing pages in the FDA Orange Book database.
How to search for “therapeutic equivalence” in the Orange Book
A practical way to locate what you’re looking for is to use the Orange Book database filters/search so you can narrow to:
- Active ingredient(s)
- Dosage form (e.g., tablet, capsule, injection)
- Strength
- Applicant/labeler (optional)
- Therapeutic equivalence status (the field that indicates equivalence evaluation)
This is the fastest path if your goal is to identify specific approved products whose listings include therapeutic equivalence determinations.
What users usually mean by “therapeutic equivalence evaluations” (A/B/C and related symbols)
Therapeutic equivalence is evaluated for generic approvals by comparing the proposed product to an RLD, based on factors such as:
- Active ingredient identity and strength
- Dosage form/route
- Bioavailability and bioequivalence evidence where required
The Orange Book uses its equivalence rating symbols to reflect how the FDA determined therapeutic equivalence for that specific listing.
If you meant “which drugs have therapeutic equivalence evaluations,” what next?
The Orange Book contains thousands of entries, so the exact answer depends on the scope you want. If you share one of the following, I can help you narrow it to the relevant Orange Book listings you’re trying to find:
- Active ingredient(s) or drug name(s)
- Dosage form (tablet/capsule/solution, etc.)
- Strength
- Whether you want only generics with equivalence ratings (or also brand/RLD entries)
Where DrugPatentWatch fits in
If you’re also trying to connect therapeutic equivalence listings to exclusivity or patent status, DrugPatentWatch can help identify relevant patents/exclusivities for specific drugs (useful when therapeutic equivalence listings relate to generic entry timing). You can browse DrugPatentWatch here: https://www.drugpatentwatch.com/ [1]
Sources:
1. https://www.drugpatentwatch.com/