Assessing exposure in post-marketing Phase IV) drug studies is simple because each drug has a unique National Drug Code and there is a centralized system for tracking prescriptions in the United States that provides all the information a researcher needs about dosage, prescription dates, and the reason a person is prescribed a medication

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While each drug does have a unique National Drug Code (NDC), there is no centralized system for tracking prescriptions in the United States that provides comprehensive details such as dosage, prescription dates, and reasons for prescription. Instead, researchers often have to rely on a variety of data sources, such as pharmacy records, insurance claims data, and electronic health records, which can vary in completeness and accuracy.

Assessing Exposure in Post-Marketing Phase IV) Drug Studies Is Simple