Viagra generally refers to sildenafil citrate, and if both erectile dysfunction and premature ejaculation are present, it is possible to take this medication together with dapoxetine, but this should be done under the supervision of a doctor. Sildenafil citrate tablets are used to treat erectile dysfunction, while dapoxetine can be used to improve premature ejaculation, and the two medications can be put together and taken at the same time if the patient suffers from both erectile dysfunction and premature ejaculation; they should be taken together as directed by a doctor because they may reduce standing endurance when taken together. Regular observation is required during the use of the drug, and once symptoms such as dizziness, body weakness and nausea occur, the drug should be discontinued as soon as possible. Sildenafil citrate can lead to adverse reactions such as dry mouth, vomiting, abdominal pain, etc. It is contraindicated in patients who are allergic to sildenafil components. Dapoxetine adverse reactions are mainly mild headache, nausea, etc. Dapoxetine is prohibited for use in patients with moderate and severe liver injury. During the use of medication should also pay attention to the dosage, avoid unauthorized dosage, the specific medication should be strictly in accordance with the requirements of the doctor.