It's wierd to think about, but we're basically bags of micro-organisms living in perfect balance when things are how they're supposed to be. Anytime you take an antibiotic, you're killing off some microbes..and that allows other microbes to flourish. Specifically, yeast. If it's vaginal, you'll need something like Monistat to treat. For yeast on belly, thighs, etc., here's a great treatment my daughter (a PA) turned me onto. Rub antiperspirant over the area (this keeps the area dry: yeast needs moisture to grow) and then powder over that with Desenex. You'll find it on the aisle for dealing with athlete's foot, which sounds strange, but the 2% Miconazole Nitrate is an antifungal no matter where you use it (except DON'T use it on mucous membranes). If you have no luck with that, you might have to get a prescription for a stronger percentage.

Anyway, the relief is almost instantaneous for the itching and burning, and works pretty quickly controlling the rash.

As to why adding other drugs to Cipro triggers it: that's apparently your tipping point. Your body can handle so much and then the balance gets out of whack...

Good luck. Oh, by the way, I've gotten used to using the antiperspirant on the areas most prone to get yeast even when I'm not suffering an outbreak. It doesn't hurt anything, and often that stops it before it gets started. (Remember, the little guys need moisture to grow!)