 <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]  particles or discoloration. If either is present, do not use the liquid. Learn how to store and discard medical supplies safely. When meperidine is injected into a vein, it is given very slowly to prevent serious side effects. If this medication is given into a muscle or under the skin, it is important to change the injection site each time to lessen injury under the skin. You should be lying down when the injection is given to prevent side effects such as dizziness. The dosage is based on your medical condition and response to treatment. Do not increase your dose or use this drug more often or for longer than prescribed because your risk of side effects may increase. Properly stop the medication when so directed. Pain medications work best if they are used as the first signs of pain occur. If you wait until the pain has worsened, the medication may not work as well. If you have nausea, ask your doctor or pharmacist for ways to decrease it (such as lying down with as little head movement as possible). Suddenly stopping this medication may cause withdrawal, especially if you have used it for a long time or in high doses. To prevent withdrawal, your doctor may lower your dose slowly. Tell your doctor or pharmacist right away if you have any withdrawal symptoms such </s>