Pain relief medicines can be injected into a vein through a small tube called an intravenous (IV) catheter. The tip of the tube stays in your vein all the time that the medicine is being used. Medicine given this way goes through your body fast, so it starts to work quickly. This method of pain relief works well for brief pain.
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With a patient-controlled analgesia (PCA) pump, you can control your own doses of pain medicine. When you begin to feel pain, you push a button to inject medicine into your vein; a small tube must first be put into your vein. If you use the PCA pump, you have to learn how to use it and when to use it.
Pain medicine can also be put into your back through a small tube called an epidural catheter. This method works well when you're having surgery on your chest or your stomach. It takes a specially trained doctor, called an anesthesiologist, to put the small tube in your back. This person also watches you for problems that can happen several hours after the pain medicine is given
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