The adrenergic ligand library contains 84 ligands including endogenous neurotransmitters, agonists, antagonists, and marketed drugs. The library is ideal for screening or identifying recombinant orphan G protein-coupled receptors, target validation, secondary screening, assay development, and other pharmacological applications. The adrenergic ligand library is 1 plate of the larger neurotransmitter library which contains over 650 CNS receptor ligands.