 <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]  your dose, take it more often, or stop taking this medication without your doctor's approval. It is very important to follow the diet recommended by your doctor to get the most benefit from this medication and to prevent serious side effects. Do not take more than 2 grams of calcium a day while you are taking this medication. 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.) Use this medication regularly to get the most benefit from it. To help you remember, take it at the same time each day that you have a prescribed dose.The side effects of Doxercalciferol Oral: Headache, upset stomach, constipation, nausea, vomiting, or 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 </s>