 <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]  doctor or pharmacist. Take this medication by mouth with or without food as directed by your doctor, usually 3 to 4 times daily. Take with food or milk if stomach upset occurs. Your doctor may direct you to start this medication at a low dose at bedtime and gradually increase your dose to prevent side effects such as drowsiness and dizziness. If you are changing from a different anticonvulsant to primidone, your doctor may direct you to continue your old medication and slowly lower the dose as you begin taking primidone. Follow your doctor's instructions carefully. The dosage is based on your medical condition, age, weight, lab tests, and response to treatment. It may take several weeks to reach the best dose for you. This medication works best when the amount of drug in your body is kept at a constant level. Take this drug at evenly spaced intervals. To help you remember, take it at the same times each day. Do not stop taking this medication (and other anticonvulsant medications) without consulting your doctor. Your seizures may worsen or cause a very severe seizure that is difficult to treat (status epilepticus) when this drug is suddenly stopped. If you suddenly stop using this medication, you may have withdrawal symptoms ( </s>