 <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] ercept controls your body's defensive response by blocking the action of a certain natural substance (TNF) that is used by the immune system. Treatment decreases redness, itching and scaly patches in psoriasis as well as the pain, swelling and stiffness of joints in arthritis. This medication can stop the progression of disease and joint damage, resulting in improved daily functioning and quality of life.This medication treats but does not cure autoimmune diseases. Symptoms usually return within 1 month of stopping the medication. How to use Enbrel Pen Injector Read the Medication Guide and Instructions for Use provided by your pharmacist before you start using this drug and each time you get a refill. If you have any questions, ask your doctor or pharmacist. Inject this medication under the skin of the thigh, abdomen, or upper arm as directed by your doctor, usually once or twice a week. The dosage is based on your medical condition and response to treatment. Children's dosage is also based on weight. Do not change your dose without consulting your doctor. Use this medication regularly to get the most benefit from it. To help you remember, use it on the same day(s) each week. If you are using this medication at home, learn all preparation and usage instructions </s>