About RxSaurus

ABOUT RXSAURUS

What Is RxSaurus?

RxSaurus is a free, open-access drug equivalency lookup and comparison tool designed for healthcare professionals, pharmacists, medical students, and informed consumers. Our mission is to make drug equivalency information transparent, accessible, and easy to understand by consolidating data from multiple authoritative U.S. government sources into a single, unified interface.

When a physician considers switching a patient from one medication to another — whether due to cost, insurance coverage, side effects, or clinical preference — they need reliable equivalency information. RxSaurus provides that information by aggregating and cross-referencing data from the FDA, NLM, and other regulatory databases to present a comprehensive view of how drugs relate to one another.

The Problem We Solve

Drug equivalency information is scattered across multiple government databases, each with its own format, terminology, and query interface. The FDA Orange Book provides therapeutic equivalence evaluations. RxNorm provides normalized drug names and relationships. DailyMed provides FDA-approved labeling. OpenFDA provides structured access to regulatory data. Navigating these sources individually is time-consuming and requires specialized knowledge of each database's structure and terminology.

RxSaurus consolidates these sources into a single, intuitive lookup tool that presents equivalency information in a clear, structured format — saving healthcare professionals valuable time and reducing the risk of information gaps.

How It Works — The Four Layers of Equivalency Data

RxSaurus organizes drug equivalency information into four distinct layers, each representing a different type of relationship between medications:

Layer 1: Exact Generic Equivalents (AB-Rated) These are FDA-approved generic drugs that have been rated as therapeutically equivalent to their reference listed drug (RLD) by the FDA. An AB rating means the FDA has determined that the generic product meets bioequivalence requirements and can be expected to produce the same clinical effect and safety profile as the brand-name product. This is the strongest form of equivalency — pharmacists can typically substitute AB-rated generics without prescriber approval (subject to state law).

Layer 2: Same-Ingredient Alternatives These are drugs that contain the same active ingredient but may differ in dosage form, strength, route of administration, or manufacturer. For example, a brand-name drug and its authorized generic, or the same drug available as both a tablet and a capsule. Same-ingredient alternatives require clinical judgment to determine appropriateness for a given patient.

Layer 3: Same-Class Therapeutic Alternatives These are drugs in the same pharmacological or therapeutic class that may be considered as alternatives based on clinical guidelines and evidence. For example, two different statins (e.g., atorvastatin and rosuvastatin) are therapeutic alternatives within the HMG-CoA reductase inhibitor class. Therapeutic alternatives require prescriber evaluation and a new prescription — they are not interchangeable at the pharmacy level.

Layer 4: Community-Reported Insurance Coverage This layer contains user-contributed insurance coverage data, including formulary status, tier placement, prior authorization requirements, and step therapy requirements reported by healthcare professionals and patients. This data is clearly labeled as "User-Reported" or "Community Data" and has not been verified by RxSaurus. It is intended as a supplementary reference and should always be verified directly with the patient's insurance plan.

Who Uses RxSaurus?

Physicians and Prescribers: Use RxSaurus to quickly identify equivalent medications when a prescribed drug is not covered by a patient's insurance, when a lower-cost alternative is needed, when switching between brand and generic formulations, or when considering therapeutic alternatives within a drug class.

Pharmacists: Use RxSaurus as a reference tool to verify therapeutic equivalence ratings, identify AB-rated generic substitutions, and access cross-referenced drug class information.

Medical and Pharmacy Students: Use RxSaurus as an educational resource to learn about drug classifications, therapeutic equivalencies, and the regulatory framework for drug approval and substitution.

Informed Consumers and Patients: Use RxSaurus to learn about their medications, understand the differences between brand-name and generic drugs, and have more informed conversations with their healthcare providers.

Our Commitment to Accuracy

All drug data on RxSaurus is sourced from authoritative U.S. government databases, including the U.S. National Library of Medicine (NLM), the U.S. Food and Drug Administration (FDA), the FDA Orange Book, DailyMed, and OpenFDA. We do not fabricate, estimate, or editorialize drug equivalency data.

For complete information about our data sources and attribution, please visit our Data Sources & Attribution page.

Important Disclaimer

RxSaurus is an informational reference tool only. It does not provide medical advice, and the information on this Site should not be used as a substitute for professional medical judgment. Always consult with a qualified healthcare professional before making any changes to a medication regimen. For our full legal disclaimers, please review our Terms of Service and Medical Disclaimer.