 <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]  a refill. If you have any questions, ask your doctor or pharmacist. Take this medication by mouth as directed by your doctor, usually 2 or 3 times a day. This medication is best taken 30 to 45 minutes before a meal. Carefully measure the dose using a special measuring device/spoon. Do not use a household spoon because you may not get the correct dose. If you have stomach upset, you may take this medication with or after a meal or snack. Taking this medication late in the day may cause trouble sleeping (insomnia). Take this medication regularly to get the most benefit from it. To help you remember, take it at the same times each day. The dosage is based on your medical condition and response to treatment. Your doctor may direct you to gradually increase or decrease your dose. Also, if you have used it for a long time, do not suddenly stop using this drug without consulting your doctor. If you suddenly stop using this medication, you may have withdrawal symptoms (such as depression, suicidal thoughts, or other mental/mood changes). To help prevent withdrawal, your doctor may lower your dose slowly. Withdrawal is more likely if you have used methylphenidate for a long time or in high doses. Tell your doctor or pharm </s>