Question: how long do you have to wait to take viagra again?
Answer: Viagra comes as a 25 milligram (mg), 50 mg, or 100 mg tablet to take by mouth. Typically, the recommended dose is 50 mg taken about one hour before sexual activity. But you can take Viagra anywhere from 30 minutes to four hours before you have sex. This medicine usually shouldn't be used more than once a day.