 <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] . When used to treat flu in adults, the medication is taken twice a day. Do not increase your dose or take rimantadine more often than prescribed. Dosage is based on your medical condition and response to therapy. In children, the dosage is also based on body weight. Begin taking rimantadine as soon as possible after being exposed to the flu or developing flu symptoms. Take this medication for the full time prescribed. Stopping this medication too soon may allow the virus to continue to grow, which can lead to severe flu infection. If you are taking the syrup, measure the dose carefully with a medication spoon/cup. Inform your doctor if your condition lasts or gets worse.The side effects of Rimantadine Oral: Trouble sleeping, nausea, vomiting, loss of appetite, dry mouth, weakness, dizziness, drowsiness, or nervousness may occur. If any of these effects last or get worse, notify 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 away if you have any serious side effects, including: mental/mood changes </s>