 <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]  report side effects to Health Canada at 1-866-234-2345.The precautions of Cidofovir Intravenous: Before using cidofovir, tell your doctor or pharmacist if you are allergic to it; or to other antivirals (such as ganciclovir); or to probenecid; or to other sulfa drugs (such as sulfamethoxazole); or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details. Before using this medication, tell your doctor or pharmacist your medical history, especially of: diabetes, ganciclovir eye implant, kidney disease. This drug may cause vision changes. Do not drive, use machinery, or do any activity that requires clear vision until you are sure you can perform such activities safely. Limit alcoholic beverages. Older adults may be at a greater risk for kidney damage while using this drug. During pregnancy, cidofovir should be used only when clearly needed. It may harm an unborn baby. Discuss the risks and benefits with your doctor. The manufacturer recommends avoiding pregnancy. To prevent pregnancy, men with female partners should use effective barrier </s>