This drug is a non-competitive excitatory amino acid receptor antagonist, which is able to increase the concentration of glutamate in the brain, improve cognitive dysfunction in patients with dementia, and also have some effect on the psychiatric symptoms caused by dementia. The indication for this medicine is moderate to severe Alzheimer’s disease, but it also has a role within the treatment of other age-related dementias. This medicine needs to be used under the supervision of a doctor, and its side effects, as well as the way of using it, may need to be directed by a doctor, so that dementia should not be suspected, and then give the patient the use of memantine hydrochloride, because it may bring some unwanted side effects, and in the case of improper dosage, the side effects may be heavier, which affects the safety of the patient’s medication.