The most comprehensive text covering pharmaceutical sciences is:

The most comprehensive text covering pharmaceutical sciences is "Remington, The Science and Practice of Pharmacy." This reference work is well-respected and widely utilized in the field of pharmacy. It provides an extensive overview of various aspects of pharmaceutical sciences, including the chemistry of drugs, their formulation, preparation, and dispensing, as well as related fields such as pharmacology, pharmacotherapy, and legal and ethical considerations in pharmacy practice.

The breadth of topics covered in "Remington" makes it a key resource for pharmacy students, technicians, and professionals seeking a foundational and detailed understanding of the pharmaceutical sciences. It combines both theoretical knowledge and practical guidance, making it suitable for various aspects of pharmaceutical education and practice.

In contrast, while "Goodman and Gilman's The Pharmacological Basis of Therapeutics" focuses more on pharmacology and the mechanisms of drug action, the "Orange Book" primarily serves as a reference for therapeutic equivalence and FDA-approved drug products. The "American Drug Index" provides a comprehensive listing of drugs but does not delve as deeply into the broader field of pharmaceutical sciences as "Remington" does.