They don't interact, but I don't see the point.
Dr. Rockoff
Can I use both Lamisil creme and Oxistat creme together? Do the medecines counter act each other?
Mentax, Oxistat, and Lamisil are all effective. In my experience, fungus that's grown because of steroid use (it's happened to me, too, I confess) sometimes needs a few days of oral Lamisil to turn it around, perhaps a week. I suggest you ask your new dermatologic practitioner to consider adding this to your topical regimen. Keep in mind, though, that eventually your rash will be cured and go away. The first part of the many months it's taken, when you were using the steroid, doesn't count.....
Best.
Dr. Rockoff