You may be taking other medicines that should not be taken at the same time. Taking Renvela can make it harder for your body to absorb certain drugs, making them less effective:
ciprofloxacin (Cipro) should be taken at least 2 hours before or 6 hours after you take Renvela;
mycophenolate mofetil (CellCept) should be taken at least 2 hours before you take Renvela.
