What are the key differences between USP 42 and NF 37?

The key differences between USP 42 and NF 37 are the standards they cover. USP 42 focuses on pharmaceuticals and related products, while NF 37 covers excipients and other non-pharmaceutical ingredients. Additionally, USP 42 includes monographs for drug substances and dosage forms, while NF 37 includes monographs for non-drug substances.