Alzheimer disease is a neurodegenerative disease of memory loss. Alzheimer’s disease is the most common cause of dementia. The common symptoms of Alzheimer disease are memory loss and cognitive decline. The cause of Alzheimer’s is unknown. Biomarkers for Alzheimer’s can be used in the diagnosis of the disease. If true, increasing oestrogen exposure through postmenopausal hormone replacement therapy might also help prevent Alzheimer’s disease. The pharmacological treatment of Alzheimer disease are Cholinesterase inhibitor like Tacrine, Donepezil, Rivastigmine and Galantamine, Memantine, Anti-Amyloid therapy, immunotherapy, Monoclonal Antibodies like Bapineuzumab, Soanezumab and Aducanumab, Tau targeted therapy in clinical trials. The major objective should be to minimise the patient’s symptoms severity. Support should be given to the patient in order help them to restore his ability to maintain a normal life. Despite the fact that the condition is fatal, the symptoms can be controlled with medication and the appropriate physical and mental care, thereby reducing the patient’s suffering.