A patient-controlled epidural is almost standard practice these days. A press of the button allows you to deliver the dose of medication that you need to help control the pain. It gives you some degree of control in a situation where you might not have much - which works not only medically, but psychologically as well, to improve your delivery experience.
An epidural delivers a very small amount of medication into the spine. Note that epidurals aren't always 100 percent effective and can have side effects such as itchiness, backaches, headaches, and hypotension.
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