Sinusitis
"I had pneumonia the month before and was given Biaxin for 10 days.  After a month,  I started to have horrible sinus pains and was very weak and tired.  After chest / sinus xray  I was prescribed Levaquin for 10 days x 500mg.    I was concerned about Levaquin due to side effects mentioned online.    
It was recommended during the Levaquin to drink a ton of water as well as take a probiotic.   I took probaclac 7 twice a day(brkfst / dinner) and the levaquin at lunch time.   Other then a few minor tendon aches that only lasted a day, I had no other side effects with the medication.   Maybe the probiotc / ton of water helped.  i felt better after day 4.  100% better now."