urinary tract infection
"Based on results of a urine culture, I was put on this medication.  I have taken 4 pills.  While at work today, my tongue was feeling like I just took a big bite of piping hot pizza.  The burning feeling was quite intense and  I had not eaten anything that might have caused this.  I also had numbness of my lips.  The last pill I took was at 7:30 am and I still have intense burning and a bit of numbness.  I was puzzled and decided to look up side effects of this new medication because it was the only thing newly exposed to my body.  Since these problems were listed in your side effects listing, I will immediately discontinue using it."