I use Ovestin and do a 2-3 night continual as required. That is, after the initial every night use I dropped it successfully to every 3rd and 7th night unless I feel symptoms recurring - then I use an application for 2-3 nights then see how the bladder area is feeling, if necessary I then alternate for a week and review .......
If my bladder is irritated. I also use Nurofen which helps ease the feelings.
Vagifem can be used every night as it's a lower dose then the 25mg which it was initially delivered at.