 <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]  for more details.This medication should not be used in children younger than 5 since it may not be effective.Baloxavir marboxil is not a substitute for the flu vaccine. (See also Notes section. How to use Baloxavir Marboxil Tablet Read the Patient Information Leaflet if available from your pharmacist before you take baloxavir marboxil. If you have any questions, ask your doctor or pharmacist. Take this medication by mouth with or without food as directed by your doctor, usually a single dose. The dosage is based on your weight. For the best effect, take this medication at least 4 hours before or 2 hours after taking other products that contain aluminum, iron, zinc, selenium, calcium, or magnesium. These products may make this medication not work well. Some examples include antacids, vitamins/minerals, dairy products (such as milk, yogurt), and calcium-enriched juice. Other kinds of infections may have symptoms like flu or can occur along with flu. These infections may need different kinds of treatment. Tell your doctor if you develop new symptoms during or after treatment, or if your condition does not get better, or if it gets worse.The side effects of Baloxav </s>