Nitric Oxide can act as both protecting and aggravating factor in Alzheimer's Disease. Nitric oxide can be considered as a neurotoxic factor in Alzheimer's Disease. Nitric Oxide induces neuro plasticity, neuroprotection, neurogenesis, long-term potentiation, and myelination. Drugs based on Nitric Oxide have shown promising results in Alzheimer's Disease. Nitric Oxide can via sundry ways ameliorate memory formation.