sinusitis
"I was given Levofloxacin 750 mg for 5 days, for a sinus infection.  On the 5th day I started having Achille Tendon pain.  I've been off the medication for 4 days and I now have some swelling in the area as well as pain.  I have never had problems with my tendons.  In my opinion taking the drug was a big mistake and one that I regret.  From all I've read this condition may not go away for a year if it even goes away.  For me the cure wasn't worth the horrible side effects.  I won't take its again or anything else in the Fluoroquinolone family."