Tioconazole
"I have used Monistat 1 many times and it's worked fantastically!  
I used it today at 3:45 and by 6:30 I was on FIRE!  By 8:00 I swear battery acid would have felt better than this burning that I was experiencing.  I have a very high pain tolerance.  And this burning, stinging, chemical burning I was feeling is far beyond any pain tolerable level.  I was sweating, shaking, light headed and had goosebumps I was in so much pain not to mention I was also bleeding from this.  

I have used this product in the past and have had no issues.  In fact, it worked great.  But this time...  I will NEVER EVER use it again.  

It's 12:am now, and the pain experience had subsided maybe a notch.  It's going to be a long night..."