Which reference source provides comprehensive and timely drug information about prescription and OTC products?

The Drug Facts and Comparisons is widely regarded for providing comprehensive and timely drug information about both prescription and over-the-counter (OTC) products. It is known for its detailed monographs that cover dosing, side effects, drug interactions, and other essential information needed by healthcare professionals for clinical decision-making. The resource is continually updated, ensuring that pharmacists and technicians have access to the latest data, which is crucial in the ever-evolving field of pharmaceuticals.

The other options, while valuable resources, may not offer the same breadth and immediacy of information across the full spectrum of both prescription and OTC medications. For instance, the American Hospital Formulary Service primarily focuses on drug formularies and is more geared towards hospital use. The Physicians Desk Reference is a compilation of prescribing information predominantly from manufacturers and may not be as comprehensive in regular updates for OTC products. The USP DI focuses more on drug information specifically for health professionals or patients in a structured manner but may not cover every drug or product as extensively as Drug Facts and Comparisons.