Recent advances in NMR-based screening methods have made it possible to scr
een larger libraries of molecules with higher throughput. However, experien
ce shows that intelligent library design is important if NMR screening is t
o succeed in aiding our discovery of potent and useful lead compounds. This
review presents the current state-of-the-art methodologies for designing p
rimary and follow-up libraries for NMR screening. Diversity, drug-likeness
and combinatorial libraries are discussed, and the inherent pitfalls of the
NMR approach are addressed.