 <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]  belongs to a class of drugs known as opioid analgesics. It works in the brain to change how your body feels and responds to pain. How to use Duramorph Ampul Depending on your specific product, this medication is given by injection into a vein, into a muscle, or under the skin. Use this product exactly as directed by your doctor. Read and learn all of the manufacturer's instructions for preparation and use. If you have any questions about using this medication properly, consult your doctor or pharmacist. Preservative-free morphine may also be given by a doctor as an injection into the area around the spinal cord (epidural) or into the fluid-filled space that contains the spinal cord (intrathecal). In this case, the medication is first given in the hospital where you can be monitored closely. If your doctor directs you to continue using this medication at home, it is usually given as a continuous injection using an infusion pump placed under your skin. The dosage is based on your medical condition and response to treatment. For children, the dosage may also be based on weight. Do not increase your dose, use the medication more often, or use it for a longer time than prescribed. Properly stop the medication when so directed. Pain medications work best </s>