 <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]  drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval. Sevelamer may interfere with the effectiveness of some drugs (including ciprofloxacin, mycophenolate, thyroid medications such as levothyroxine, among others) by making it more difficult for them to be absorbed by the stomach. Ask your pharmacist about the best times to take your other medications. Does Renvela 800 Mg Tablet interact with other drugs you are taking? Enter your medication into the WebMD interaction checker Check InteractionThe overdose of Renvela Oral: If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison control center right away. US residents can call their local poison control center at 1-800-222-1222. Canada residents can call a provincial poison control center.  Notes Your doctor may direct you to follow a special diet to help lower your blood phosphate levels. Follow the diet closely. Do not share this medication with others. Lab and/or medical tests (such as blood phosphate, calcium, bicarbonate and chloride levels) should be done while </s>