What if a patient is taking magnesium, iron, zinc, or other supplements?
The bioavailability or absorption of Ceftin, Doxycycline, and the Floroquinolones can be effected by divalent and trivalent cations such as Magnesium, Iron, Zinc, Aluminum, and so forth. Therefore, if these are taken within four to eight hours of Gadifloxacin, Levofloxacin, or Moxifloxacin administration, the antibacterial effect may be diminished by 50% or more for the entire 24 hours because these agents are given only once daily.
