 <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]  side effects of this medication. Avoid drinking large amounts of beverages containing caffeine (coffee, tea, colas), eating large amounts of chocolate, or taking nonprescription products that contain caffeine. If your symptoms do not improve after 7 days, if they worsen or return, if you develop a headache that doesn't go away, fever, or rash, or if you think you may have a serious medical problem, get medical help right away.The side effects of Sudafed Oral: Nausea, vomiting, trouble sleeping, dizziness, headache, or nervousness may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. Stop taking this medication and tell your doctor promptly if you have dizziness, nervousness, or trouble sleeping. If your doctor has directed you to use this medication, remember that 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. Stop taking this medication and tell your doctor right away if you have any serious side effects, including: fast/irregular/pounding heartbeat, mental/mood changes (such as anxiety, confusion, restlessness), shaking (tremor), difficulty urinating. </s>