How often to take Viagra cannot be generalized, but should be determined by the patient’s personal constitution, symptoms of the disease and the rate of absorption of the drug. Viagra is sildenafil, which is used to treat erectile dysfunction in men. There are two main uses for it, one is to take it three times a day, every 8 hours; the other is to take it once every 4-6 hours, four to six times a day. The specific dosage and time interval used must be taken under the guidance of a doctor. Viagra has obvious cardiovascular side effects and should be taken with caution by patients with cardiovascular disease. For patients, it is important to read the instructions in detail before using the medication, to understand the precautions and dosage of the medication and so on. Patients with erectile dysfunction should pay attention to proper physical exercise, appropriate abstinence from sexual intercourse, and should remain optimistic and avoid too much stress.