text: how long should you wait to have sex after a yeast infection? i used monistat 1 and the box says not to have sex while using the product, but is that just the day that you use it or the 3 days it is supposed to take to cure it?? monistat is good, but not great because it's messy after  using so it would be hard to tell if your infection is gone or not.  i suggest in the future u use diflucan it's a pill u must have a prescription for and it works much better and faster than monistat 1,3 or 7.  to answer your question wait at least 7-10 days.....