 <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]  cortisol. Cortisol is important for keeping your body functioning well and for good health. How to use Metyrapone Capsule Take this medication by mouth with milk or a snack as directed by your doctor. The dosage is based on your weight. If you are directed to use the single-dose test, take your dose of metyrapone at midnight. Early the next morning, your doctor will take a blood sample from you. If you are directed to use the multiple-dose test, take this medication exactly at the times recommended by your doctor. For one day, several days before taking this medication, you will need to collect all your urine for a 24-hour period for testing, and then again on the day after you take this medication. It is important to take this medication as directed to assure proper test results.The side effects of Metyrapone Oral: Nausea, upset stomach, headache, dizziness, or drowsiness may occur. If any of these effects last or get worse, tell your doctor promptly. Remember that your doctor has prescribed this medication because the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. A very serious allergic reaction to this drug is rare </s>