Pharmacokinetics of Anesthetics and Analgesics in Children and Adolescent

This is a research study to find out what the side effects are of certain drugs that are commonly used for pain and to put people to sleep for surgery. The researchers also want to know how the drug is broken down in the body. Participants will be given these drugs as they are prescribed by their regular doctor. As part of the participant's standard of care, doctors will perform tests, ask questions, review medical information and measure vital signs (heart rate, blood pressure, etc). The researchers will collect information that doctors have already written in the medical records. The researc…