 <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] , an important body chemical, in the gut. This can cause low phosphate levels, especially if you use this medication in large doses and for a long time. Tell your doctor right away if you have any of the following symptoms of low phosphate: loss of appetite, unusual tiredness, muscle weakness. Tell your doctor right away if you have any serious side effects, including: dizziness, fainting. Get medical help right away if you have any very serious side effects, including: slow/shallow breathing, slow/irregular heartbeat, mental/mood changes (such as confusion), deep sleep, pain with urination. A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing. This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist. In the US - Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch. In </s>