 <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]  day.The side effects of Cystagon Oral: Nausea, vomiting, fever, loss of appetite, tiredness, drowsiness, and diarrhea may occur. If any of these effects last or get worse, tell 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 (such as depression), deep sleep, seizures, unusual tiredness, headache, hearing problems (such as buzzing/ringing in the ears), dizziness, eye/vision problems (such as blurred vision, loss of vision, eye pain), skin problems (such as thinning of the skin, stretch marks, purple bleeding patches on the elbows), bone problems (such as bone/joint/back pain, leg pain, broken bones). Get medical help right away if you have any very serious side effects, including: black/bloody stools, stomach/abdominal pain, vomit that looks like coffee grounds. Cysteamine can commonly cause a rash that may not be serious. However, you may </s>