Abstract: Compounds of general formula (Ia): in which R1, A1, m, X, n, Y and R3 have any of the meanings given in the specification, have affinity for sigma receptors and are useful in the treatment of disorders of the central nervous system.

Abstract: The invention discloses methods and compositions useful for facilitating neuronal regeneration and functional recovery in neurodegenerative diseases. The methods and compositions utilize ligands for the sigma receptor, wherein the ligand is preferably SA-4503, or salts, or solvates thereof. These molecules can be delivered alone or in combination with agents which treat or prevent neurodegenerative diseases such as those caused by ischemic stroke, diabetic peripheral neuropathy, cancer therapy induced neuropathy, multiple sclerosis, amyotrophic lateral sclerosis, traumatic brain injury, spinal cord injury, Huntington's disease or Parkinson's disease. In other methods, the sigma receptor ligands are administered after stroke to facilitate functional recovery. The administration of the sigma receptor ligands effects faster functional recovery.