Application Pathways Updated January 14, 2026

What is the Orange Book?

The Orange Book is FDA's official list of approved drug products with therapeutic equivalence evaluations. Essential for generic drug development.

Definition

Orange Book is FDA’s official publication titled “Approved Drug Products with Therapeutic Equivalence Evaluations.” It lists all drugs approved under the FD&C Act, their therapeutic equivalence ratings, patent information, and exclusivity status.

How the Orange Book Works

The Orange Book serves multiple purposes in the pharmaceutical ecosystem, providing transparency on approved products and enabling generic development.

Key Information Included

  • All FDA-approved drug products
  • Therapeutic equivalence codes
  • Patent listings and expiration dates
  • Exclusivity periods and types
  • Reference Listed Drug designations

Therapeutic Equivalence Codes

CodeMeaning
AANo bioequivalence problems
ABBioequivalence demonstrated
ANAerosol products
ATTopical products
BCExtended-release dosage forms
BNNebulizer products
BXInsufficient data

Why BD Teams Track Orange Book

For business development professionals, Orange Book data is essential:

  • Deal Implication: Patent and exclusivity listings determine generic entry timing and licensing opportunities
  • Due Diligence Focus: Verify all relevant patents are listed and assess Paragraph IV exposure
  • Opportunity Signal: Products approaching patent expiry create authorized generic partnership opportunities

Frequently Asked Questions

What is the Orange Book?

The Orange Book is FDA's publication listing all approved drug products with therapeutic equivalence ratings, patent information, and exclusivity data.

Why is it called the Orange Book?

Named for its original orange cover, the official title is 'Approved Drug Products with Therapeutic Equivalence Evaluations.'

How is the Orange Book used?

Generic manufacturers use it to identify Reference Listed Drugs and patents to certify against; pharmacists use it for substitution decisions.

What do Orange Book ratings mean?

Ratings like 'AB' indicate therapeutic equivalence and substitutability; 'BX' indicates insufficient data for equivalence determination.

How often is the Orange Book updated?

The electronic Orange Book is updated daily with new approvals, patent listings, and exclusivity information.

Track Regulatory Filings with PharmaDB

Get real-time access to FDA approvals, pipeline data, and regulatory intelligence for BD teams.

Join the Waitlist