A Concise Review of Common Plant-derived Compounds as a Potential Therapy for Alzheimer's Disease and Parkinson's Disease: Insight into Structure-Activity-Relationship.

Alzheimer's disease (AD) and Parkinson's disease (PD) are the two most common neurological illnesses that affect people in their later years. Memory loss is the hallmark of Alzheimer's disease, while dyskinesia, or loss of mobility, is associated with muscle rigidity and tremors in PD. Both diseases are unrelated, however, they do have a few similarities associated with extrapyramidal abnormalities, particularly stiffness, which has been linked to concomitant PD in many AD patients.