Make sure the doctor knows if the patient is also using other supplements or medicines that contain Calcium. Calcium can change the way other medicines work if the patient takes them at the same time. If the patient needs to use other medicines, take them at least 2 hours before or 2 hours after the patient takes the calcium supplement. This is particularly important if the patient is also using phenytoin or a tetracycline antibiotic to treat an infection (such as doxycycline, minocycline), fluoroquinolone antibiotics, and levothyroxine (thyroid medication).
Do not take the calcium supplement with a high-fiber meal (such as bran, whole-grain cereal or bread, fresh fruits).
Do not smoke cigarettes or cigars and do not drink large amounts of alcohol or caffeine (for example, more than 8 cups of coffee).