What type of reduction in efficacy is there in levaquin (levofloxacin) when taking with calcium supplement? I did this for the first three days of a 10 day course.

% unknown. Calcium binds Levaquin (levofloxacin) thus not allowing it to be absorbed. (levaquin (levofloxacin) canadian prescribing information. Janssen-ortho inc. February 4, 2005.) if taken many hours apart, they're ok on the same day. O/w, would consider the first few days as ineffective and continue the course from day 4 as though it were day 1.