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Preanesthetic medications are drugs administered to a patient before the induction of general anesthesia, with the purpose of preparing the body for anesthesia, reducing the potential for side effects, and ensuring a smoother and safer anesthesia experience. These medications serve several roles, including anxiolysis, analgesia, reduction of secretions, prevention of nausea and vomiting, and stabilization of the cardiovascular system. Common preanesthetic medications include: 1. Anxiolytics (Sedatives): These are used to calm the patient, reducing anxiety and fear about the procedure. Benzodiazepines, such as midazolam and diazepam, are frequently used in this role. They act by enhancing the effects of the neurotransmitter gamma-aminobutyric acid (GABA), producing sedative, anxiolytic, and muscle-relaxant effects. 2. Opioids: These are used to provide analgesia and reduce the pain sensation during and after the surgery. Common opioids used as preanesthetic medications include morphine, fentanyl, and remifentanil. These drugs act on opioid receptors in the central nervous system, altering the perception of pain and providing relief before the surgery. 3. Anticholinergics: These drugs are used to reduce secretions, particularly salivation, which can interfere with intubation and surgery. Atropine and glycopyrrolate are examples of anticholinergics used in this context. They block the muscarinic receptors, leading to a decrease in the secretion of saliva and respiratory tract secretions. 4. Antiemetics: These are given to prevent nausea and vomiting that may be triggered by the anesthetic drugs, especially after surgery. Drugs like ondansetron and metoclopramide are commonly used. They work by blocking serotonin receptors (5-HT3 receptors) in the central nervous system, which play a major role in causing nausea. 5. H2 Antagonists: These are used to reduce gastric acid secretion and decrease the risk of ____ ____ _____ ____ _____ _______ ___.
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