I took Levaquin for 17 days (500mg). My eye site is now very poor (2 wks after the final pill), and I have to drink lots of water (always have "cotton mouth") and therefore I have to urinate all the time! The doctor said the eye sight going is temp and only 1/2 as bad as other similar drugs! I used to run fairly fast and now my times are really slow. Sometimes I get a little 'off-balance' too. This drug is the pits!