Viagra, or sildenafil tablets, do not treat Alzheimer’s disease. Sildenafil tablets are mainly used to treat erectile dysfunction. Alzheimer’s disease treatment drugs are mainly cholinesterase inhibitors, glutamate receptor antagonists, etc., with mental behavioral symptoms can be used antipsychotics, antidepressants, etc., the use of medication should follow the doctor’s instructions. Sildenafil tablets are type 5 phosphodiesterase inhibitors, which have a significant effect when used with sexual stimulation, and generally do not work if there is no sexual stimulation. Its common adverse reactions include dizziness, headache, blurred vision, etc. The use of this drug is prohibited in patients with severe cardiovascular disease or those who are allergic to the components of this drug. Alzheimer’s disease is a kind of insidious onset, progressive development of neurodegenerative diseases, clinical features mainly for cognitive impairment, mental behavioral abnormalities and social life function decline, need long-term persistent treatment. Commonly used drugs include cholinesterase inhibitors such as donepezil and carboplatin, and glutamate receptor antagonists such as memantine. In patients with moderate or severe Alzheimer’s disease, combination therapy with 1 cholinesterase inhibitor and memantine may result in better cognition, daily living ability and social functioning, and may improve psychobehavioral symptoms. Antipsychotics such as risperidone, olanzapine, and quetiapine, and antidepressants such as trazodone and citalopram may also be used if psychobehavioral symptoms are present. The appearance of Alzheimer’s disease, should be timely under the guidance of the doctor for standardized treatment, pay attention to drug indications, contraindications and adverse reactions, etc., not to use their own drug therapy.