ACADIA Pharmaceuticals Inc., a biopharmaceutical company, focuses on small molecule drugs that address unmet medical needs in neurological and related central nervous system disorders. The company has a pipeline of product candidates led by pimavanserin, which is in Phase III development stage for the treatment of Parkinson's disease psychosis. It is also developing pimavanserin that has completed Phase II co-therapy trials for the treatment of schizophrenia; and is in Phase II clinical trials for the treatment of Alzheimer's disease psychosis. In addition, the company, through collaboration with Allergan, Inc., is developing alpha adrenergic agonists, which are in Phase II clinical trials for the treatment of chronic pain; and muscarinic agonist that is in Phase I clinical trials for the treatment of glaucoma. Further, it is developing two advanced preclinical programs directed at Parkinson's disease and other neurological disorders. The company was formerly known as Receptor Technologies, Inc. ACADIA Pharmaceuticals Inc. was founded in 1993 and is headquartered in San Diego, California.