Concomitant use w/ biphosponate (alendronate, etidronate, risedronate), quinolone (ciprofloxacin, gatifloxacin, levofloxacin, lomefloxacin, moxifloxacin, norfloxacin, ofloxacin, sparfloxacin, trofafloxacin), tetracyclines (doxycycline, monocycline, tetracycline) may reduce absorption of these drugs (bisphosphonate, quinolone, tetracycline). Increased Mg level in plasma w/ boron. Ca, Mn, Fe, Na alginate reduces the absorption of Mg. Inositol hexaphosphate suppresses the absorption of Mg. Indigestible oligosaccharide increases the absorption of Mg in the colon. Phosphate reduces the absorption of phosphate & Mg. Concomitant use w/ oxalic acid-rich food (spinach, potatoes, rhubarb, legumes) or phytate acid (legumes) reduces the absorption of Mg.