 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST]  Sources of calcium include your diet, phosphate binders, or calcium supplements. If you have any questions about how much calcium you take in a day, ask your doctor or pharmacist. Do not take other supplements/vitamins (such as vitamin D) unless otherwise directed by your doctor. (See also Drug Interactions section.The side effects of Doxercalciferol Intravenous: Headache, upset stomach, constipation, nausea, vomiting, and tiredness may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. Remember that this medication has been prescribed because your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. Tell your doctor right away if you have any serious side effects, including: bone/joint/muscle pain, loss of appetite, increased thirst, increased urination, fast/slow/irregular heartbeat, mental/mood changes (such as drowsiness, disturbed/irrational thoughts or beliefs), metallic taste in mouth, weakness, unexplained weight gain or loss. A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice </s>